CN112121861A - Magnetically-recoverable immobilized platinum catalyst and preparation method and application thereof - Google Patents
Magnetically-recoverable immobilized platinum catalyst and preparation method and application thereof Download PDFInfo
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- CN112121861A CN112121861A CN202011098992.8A CN202011098992A CN112121861A CN 112121861 A CN112121861 A CN 112121861A CN 202011098992 A CN202011098992 A CN 202011098992A CN 112121861 A CN112121861 A CN 112121861A
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- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 title claims abstract description 125
- 239000003054 catalyst Substances 0.000 title claims abstract description 69
- 229910052697 platinum Inorganic materials 0.000 title claims abstract description 62
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000004793 Polystyrene Substances 0.000 claims abstract description 77
- 229920002223 polystyrene Polymers 0.000 claims abstract description 77
- 238000006243 chemical reaction Methods 0.000 claims abstract description 55
- 239000004005 microsphere Substances 0.000 claims abstract description 53
- 239000003446 ligand Substances 0.000 claims abstract description 33
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims abstract description 30
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000003960 organic solvent Substances 0.000 claims abstract description 20
- 238000003756 stirring Methods 0.000 claims abstract description 17
- 238000005406 washing Methods 0.000 claims abstract description 16
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims abstract description 15
- LSCYTCMNCWMCQE-UHFFFAOYSA-N n-methylpyridin-4-amine Chemical compound CNC1=CC=NC=C1 LSCYTCMNCWMCQE-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 14
- 239000007787 solid Substances 0.000 claims abstract description 14
- 238000001914 filtration Methods 0.000 claims abstract description 12
- 238000001035 drying Methods 0.000 claims abstract description 10
- 150000001875 compounds Chemical class 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims abstract 15
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 57
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 28
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 24
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 239000008367 deionised water Substances 0.000 claims description 19
- 239000000460 chlorine Substances 0.000 claims description 18
- 229910021641 deionized water Inorganic materials 0.000 claims description 16
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 15
- 229910052801 chlorine Inorganic materials 0.000 claims description 15
- MYRTYDVEIRVNKP-UHFFFAOYSA-N 1,2-Divinylbenzene Chemical compound C=CC1=CC=CC=C1C=C MYRTYDVEIRVNKP-UHFFFAOYSA-N 0.000 claims description 14
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 14
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 13
- 238000006459 hydrosilylation reaction Methods 0.000 claims description 12
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 12
- 239000011553 magnetic fluid Substances 0.000 claims description 10
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 9
- 239000002244 precipitate Substances 0.000 claims description 9
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 8
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 8
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 8
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 claims description 7
- ZRZHXNCATOYMJH-UHFFFAOYSA-N 1-(chloromethyl)-4-ethenylbenzene Chemical compound ClCC1=CC=C(C=C)C=C1 ZRZHXNCATOYMJH-UHFFFAOYSA-N 0.000 claims description 7
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 claims description 7
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 claims description 7
- 239000005642 Oleic acid Substances 0.000 claims description 7
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 claims description 7
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 claims description 7
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 claims description 7
- 239000000839 emulsion Substances 0.000 claims description 6
- DCAYPVUWAIABOU-UHFFFAOYSA-N hexadecane Chemical compound CCCCCCCCCCCCCCCC DCAYPVUWAIABOU-UHFFFAOYSA-N 0.000 claims description 6
- 230000007935 neutral effect Effects 0.000 claims description 6
- 238000004321 preservation Methods 0.000 claims description 6
- 239000000725 suspension Substances 0.000 claims description 6
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 claims description 6
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 5
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 5
- 239000012295 chemical reaction liquid Substances 0.000 claims description 5
- 229910052603 melanterite Inorganic materials 0.000 claims description 4
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 claims description 3
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 3
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 claims description 3
- 229910002567 K2S2O8 Inorganic materials 0.000 claims description 3
- RCEAADKTGXTDOA-UHFFFAOYSA-N OS(O)(=O)=O.CCCCCCCCCCCC[Na] Chemical compound OS(O)(=O)=O.CCCCCCCCCCCC[Na] RCEAADKTGXTDOA-UHFFFAOYSA-N 0.000 claims description 3
- 229960001701 chloroform Drugs 0.000 claims description 3
- 238000004108 freeze drying Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000005457 ice water Substances 0.000 claims description 3
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 3
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 230000000379 polymerizing effect Effects 0.000 claims description 3
- 238000000926 separation method Methods 0.000 abstract description 9
- 230000015572 biosynthetic process Effects 0.000 abstract description 4
- 238000003786 synthesis reaction Methods 0.000 abstract description 3
- 125000004122 cyclic group Chemical group 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 14
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 description 7
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 6
- 229910052700 potassium Inorganic materials 0.000 description 6
- 239000011591 potassium Substances 0.000 description 6
- 238000001291 vacuum drying Methods 0.000 description 6
- 208000012839 conversion disease Diseases 0.000 description 4
- 239000002815 homogeneous catalyst Substances 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- QQQSFSZALRVCSZ-UHFFFAOYSA-N triethoxysilane Chemical compound CCO[SiH](OCC)OCC QQQSFSZALRVCSZ-UHFFFAOYSA-N 0.000 description 4
- 238000004132 cross linking Methods 0.000 description 3
- 239000012299 nitrogen atmosphere Substances 0.000 description 3
- 125000001477 organic nitrogen group Chemical group 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000003828 vacuum filtration Methods 0.000 description 3
- 238000007259 addition reaction Methods 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000002638 heterogeneous catalyst Substances 0.000 description 2
- 238000007172 homogeneous catalysis Methods 0.000 description 2
- 239000002122 magnetic nanoparticle Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910003321 CoFe Inorganic materials 0.000 description 1
- 229910002546 FeCo Inorganic materials 0.000 description 1
- 229910005335 FePt Inorganic materials 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 229910017163 MnFe2O4 Inorganic materials 0.000 description 1
- 229910003264 NiFe2O4 Inorganic materials 0.000 description 1
- 229910018540 Si C Inorganic materials 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000012567 medical material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 239000013110 organic ligand Substances 0.000 description 1
- 238000006053 organic reaction Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 229930195735 unsaturated hydrocarbon Natural products 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
- 229910006297 γ-Fe2O3 Inorganic materials 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/16—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
- B01J31/18—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes containing nitrogen, phosphorus, arsenic or antimony as complexing atoms, e.g. in pyridine ligands, or in resonance therewith, e.g. in isocyanide ligands C=N-R or as complexed central atoms
- B01J31/1805—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes containing nitrogen, phosphorus, arsenic or antimony as complexing atoms, e.g. in pyridine ligands, or in resonance therewith, e.g. in isocyanide ligands C=N-R or as complexed central atoms the ligands containing nitrogen
- B01J31/181—Cyclic ligands, including e.g. non-condensed polycyclic ligands, comprising at least one complexing nitrogen atom as ring member, e.g. pyridine
- B01J31/1815—Cyclic ligands, including e.g. non-condensed polycyclic ligands, comprising at least one complexing nitrogen atom as ring member, e.g. pyridine with more than one complexing nitrogen atom, e.g. bipyridyl, 2-aminopyridine
-
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- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/16—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
- B01J31/165—Polymer immobilised coordination complexes, e.g. organometallic complexes
- B01J31/1658—Polymer immobilised coordination complexes, e.g. organometallic complexes immobilised by covalent linkages, i.e. pendant complexes with optional linking groups, e.g. on Wang or Merrifield resins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/16—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
- B01J31/1691—Coordination polymers, e.g. metal-organic frameworks [MOF]
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01J35/33—Electric or magnetic properties
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
- B01J35/61—Surface area
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic Table
- C07F7/02—Silicon compounds
- C07F7/08—Compounds having one or more C—Si linkages
- C07F7/18—Compounds having one or more C—Si linkages as well as one or more C—O—Si linkages
- C07F7/1804—Compounds having Si-O-C linkages
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic Table
- C07F7/02—Silicon compounds
- C07F7/08—Compounds having one or more C—Si linkages
- C07F7/18—Compounds having one or more C—Si linkages as well as one or more C—O—Si linkages
- C07F7/1804—Compounds having Si-O-C linkages
- C07F7/1872—Preparation; Treatments not provided for in C07F7/20
- C07F7/1876—Preparation; Treatments not provided for in C07F7/20 by reactions involving the formation of Si-C linkages
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/12—Chemical modification
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- B01J2231/00—Catalytic reactions performed with catalysts classified in B01J31/00
- B01J2231/30—Addition reactions at carbon centres, i.e. to either C-C or C-X multiple bonds
- B01J2231/32—Addition reactions to C=C or C-C triple bonds
- B01J2231/323—Hydrometalation, e.g. bor-, alumin-, silyl-, zirconation or analoguous reactions like carbometalation, hydrocarbation
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- B01J2531/02—Compositional aspects of complexes used, e.g. polynuclearity
- B01J2531/0238—Complexes comprising multidentate ligands, i.e. more than 2 ionic or coordinative bonds from the central metal to the ligand, the latter having at least two donor atoms, e.g. N, O, S, P
- B01J2531/0241—Rigid ligands, e.g. extended sp2-carbon frameworks or geminal di- or trisubstitution
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- B01J2531/80—Complexes comprising metals of Group VIII as the central metal
- B01J2531/82—Metals of the platinum group
- B01J2531/828—Platinum
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- C08J2325/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
- C08J2325/02—Homopolymers or copolymers of hydrocarbons
- C08J2325/04—Homopolymers or copolymers of styrene
- C08J2325/06—Polystyrene
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
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Abstract
The invention relates to the technical field of promoter synthesis, and particularly discloses a magnetically recyclable immobilized platinum catalyst, and a preparation method and application thereof: the method comprises the following steps of (1) adding a nano magnetic polystyrene chloride ball, 4- (methylamino) pyridine, NaH and an organic solvent A into a reaction container, and stirring and reacting for 12-48 h at the temperature of 0-10 ℃ under the protection of nitrogen; (2) treating the reaction solution to obtain nano magnetic polystyrene microspheres with the surfaces connected with nitrogen-containing ligands; (3) adding nano magnetic polystyrene microspheres with nitrogen-containing ligands connected to the surfaces and an organic solvent B into a reaction vessel, adding a platinum-containing compound under the protection of nitrogen, and stirring and reacting for 5-10 hours at the temperature of 50-130 ℃; (4) and filtering the reaction solution to obtain a solid, and washing and drying the solid to obtain the nano magnetic polystyrene microsphere immobilized platinum catalyst. The invention has the characteristics of easy separation, cyclic utilization, lower cost and better product quality.
Description
Technical Field
The invention relates to the technical field of promoter synthesis, in particular to a magnetically recyclable immobilized platinum catalyst and a preparation method and application thereof.
Background
The organic silicon is a chemical product with a plurality of varieties and excellent performance, can be used as a luminescent material, an adhesive, a sealing material, a medical material and the like, and has very wide application in the fields of aerospace avionics, buildings, automobiles, textiles, light industry, food and the like. The most important core skeleton of organosilicon, whether high molecular polymer or small molecule organosilicon monomer, is often related to the formation of Si-C bond, and the most important generation mode is obtained by the hydrosilylation reaction of Si-H-containing silane and unsaturated hydrocarbon. The hydrosilylation reaction generally needs to be carried out under the action of a catalyst, and the preparation and selection of the catalyst are key links which directly influence the reaction yield and the product structure selectivity. Since the advent of Speier's catalyst, platinum-based catalysts have been the best choice for hydrosilylation catalysts, and with the ensuing Karstedt's catalyst, are the two most widely used and technically mature homogeneous catalysts in the research and industrial production fields of silicone synthesis.
The nanometer magnetic carrier supported catalyst has attracted wide attention because of the realization of the rapid separation and recovery of the catalyst while keeping the advantage of the large specific surface area of the nanometer material; the magnetic nanoparticles used as catalyst and carrier may be metal (Fe, Co, Ni), alloy (FePt, FeCo, NiFe), metal oxide (Fe)3O4) And ferrite (CoFe)2O4、MnFe2O4) Etc. of Fe3O4、γ-Fe2O3、NiFe2O4The magnetic nano-particles are used as carriers of catalysts in organic reactions due to the advantages of simple preparation method, low cost, convenience for large-scale production, good magnetic responsiveness and the like.
For the hydrosilylation reaction in a homogeneous catalysis system, because reactants and a catalyst are in the same phase, the system shows homogeneous catalysis, so that the catalyst has higher reaction activity, but the platinum homogeneous catalyst has the defects of difficult separation, difficult recycling and the like; in addition, platinum is a noble metal, the use cost is too high, and the product often contains a small amount of platinum residues in a high oxidation state, so that the quality problem of the product is caused.
Therefore, the existing platinum homogeneous catalyst has the problems of difficult separation, difficult recycling, higher cost and poor product quality.
Disclosure of Invention
The invention provides a magnetically recyclable immobilized platinum catalyst, a preparation method and application thereof, aiming at solving the technical problems of the existing platinum homogeneous catalyst, and the catalyst has the characteristics of easy separation, cyclic utilization, low cost and good product quality.
The first technical scheme of the invention is as follows: the preparation method of the magnetically recyclable immobilized platinum catalyst comprises the following steps,
(1) adding a nano magnetic polystyrene chloride ball, 4- (methylamino) pyridine, NaH and an organic solvent A into a reaction container, and stirring and reacting for 12-48 h at the temperature of 0-10 ℃ under the protection of nitrogen;
(2) after the reaction in the step (1) is finished, treating the reaction liquid to obtain the nano magnetic polystyrene microsphere with the surface connected with the nitrogen-containing ligand;
(3) adding nano magnetic polystyrene microspheres with nitrogen-containing ligands connected to the surfaces and an organic solvent B into a reaction vessel, adding a platinum-containing compound under the protection of nitrogen, and stirring and reacting for 5-10 hours at the temperature of 50-130 ℃;
(4) and (4) after the reaction in the step (3) is finished, filtering the reaction liquid to obtain a solid, and washing and drying the solid to obtain the nano magnetic polystyrene microsphere immobilized platinum catalyst.
The invention prepares the nano magnetic polystyrene microsphere with the surface connected with the nitrogen-containing ligand through the nano magnetic polystyrene chlorine ball, the 4- (methylamino) pyridine and the NaH, uses the organic nitrogen-containing ligand to load the platinum catalyst on the surface of the nano magnetic polystyrene microsphere, and uses the high specific surface area and the uniform aperture distribution of the nano magnetic polystyrene microsphere to improve the specific surface area of the platinum catalyst, so that the prepared nano magnetic polystyrene microsphere immobilized platinum catalyst has the characteristics of good chemical stability, good thermodynamic stability and high mechanical strength; the invention belongs to a platinum heterogeneous catalyst, wherein the used raw materials are easy to obtain, the cost is low, the prepared catalyst can be separated from a reaction system in a filtering or centrifuging mode, the separation and purification are simple, and the catalyst can be recycled, so that the invention has the characteristics of easy separation, recycling and low cost. The nano magnetic polystyrene microsphere immobilized platinum catalyst is prepared by forming a coordination bond between a nano magnetic polystyrene microsphere and a platinum catalyst.
Preferably, the preparation of the nano magnetic polystyrene chloride balls comprises the following steps,
a. adding deionized water into a reaction vessel, and adding FeCl into the deionized water3·6H2O and FeSO4·7H2Heating to 70-90 ℃, dropwise adding ammonia water and oleic acid, and reacting for 1-3 h in a heat preservation manner after dropwise adding is completed;
b. after the heat preservation reaction in the step a is finished, filtering out the precipitate, washing the precipitate to be neutral by using deionized water, and drying the neutral precipitate to obtain the nano Fe3O4A magnetic core;
c. b, preparing the nano Fe obtained in the step b3O4Mixing the magnetic core with hexadecane HD with the same mass to obtain nano Fe3O4(ii) a/HD magnetic fluid;
d. c, nano Fe obtained in the step c3O4Mixing the/HD magnetic fluid with styrene, p-chloromethyl styrene and divinylbenzene to form an oil phase;
e. mixing deionized water and lauryl sodium sulfate to form a water phase;
f. dropwise adding the oil phase in the step d into the water phase in the step e under the stirring condition to obtain a black suspension;
g. putting the black suspension liquid obtained in the step f into an ice water bath, and performing fine emulsion for 10-30 min by using a 100-300W cell crusher to obtain fine emulsion;
h. pouring the miniemulsion obtained in step g into a new reaction vessel, and adding K into the reaction vessel2S2O8Stirring and polymerizing for 12-24 hours at a constant temperature of 60-80 ℃ under the protection of nitrogen to obtain ethanol demulsification;
i. and (5) washing the ethanol in the step h with deionized water, demulsifying, and freeze-drying to obtain the nano magnetic polystyrene chloride balls.
Preferably, the mole ratio of chlorine contained in the nano magnetic polystyrene chlorine ball to 4- (methylamino) pyridine to NaH is 1: (2-4): (5-7). More preferably, the mole ratio of chlorine contained in the nano magnetic polystyrene chlorine ball to 4- (methylamino) pyridine to NaH is 1: 3: 6.
preferably, the molar ratio of the nitrogen-containing ligand to the platinum-containing compound in the nano magnetic polystyrene microsphere with the nitrogen-containing ligand attached to the surface is 1: (1.2-1.6). More preferably, the molar ratio of the nitrogen-containing ligand to the platinum-containing compound in the nano-magnetic polystyrene microsphere with the nitrogen-containing ligand attached to the surface is 1: (1.3-1.5). The amount of the substance containing the nitrogen-containing ligand in the nano magnetic polystyrene microsphere with the nitrogen-containing ligand connected to the surface is calculated by the content of N obtained by element analysis and test.
Preferably, the organic solvent A is N, N-dimethylformamide, toluene, carbon tetrachloride, trichloromethane, ethanol, methanol or tetrahydrofuran; the volume dosage of the organic solvent A is 15-30 mL/g based on the mass of the nano magnetic polystyrene chloride ball.
Preferably, the organic solvent B is tetrahydrofuran, ethanol, N-dimethylformamide or toluene; and the volume dosage of the organic solvent B is 30-35 mL/g based on the mass of the nano magnetic polystyrene microsphere with the surface connected with the nitrogen-containing ligand.
Preferably, the FeSO4·7H2O and FeCl3·6H2The molar ratio of O is 1 (1-2); the oleic acid and FeCl3·6H2The molar ratio of O is 1 (7-9); the ammoniaThe dropwise adding amount of water is based on the condition that the pH range of the reaction solution is kept between 9 and 12. More preferably, the FeSO4·7H2O and FeCl3·6H2The molar ratio of O is 1: 1.5; the oleic acid and FeCl3·6H2The molar ratio of O is 1 (8-8.5).
Preferably, the nano Fe3O4The mass ratio of the/HD magnetic fluid to the styrene, the p-chloromethyl styrene and the divinylbenzene is 1: (0.5-1): (0.2-0.5): (0.03-0.1); the mass ratio of the sodium dodecyl sulfate to the deionized water is 1: (150-180); the sodium dodecyl sulfate and the nano Fe3O4The mass ratio of the/HD magnetofluid is 1: (4-8); said K2S2O8With nano Fe3O4The mass ratio of the/HD magnetofluid is 1: (130-140). More preferably, the nano Fe3O4The mass ratio of the/HD magnetic fluid to the styrene, the p-chloromethyl styrene and the divinylbenzene is 1: (0.7-0.9): (0.3-0.4): (0.05 to 0.07); the mass ratio of the sodium dodecyl sulfate to the deionized water is 1: (160-167); the sodium dodecyl sulfate and the nano Fe3O4The mass ratio of the/HD magnetofluid is 1: (5.6-7) 7; said K2S2O8With nano Fe3O4The mass ratio of the/HD magnetofluid is 1: (133-137).
The second technical scheme of the invention is as follows: the nano magnetic polystyrene microsphere immobilized platinum catalyst can be magnetically recycled.
The third technical scheme of the invention is as follows: the application of the nano magnetic polystyrene microsphere immobilized platinum catalyst capable of being magnetically recycled in the hydrosilylation reaction. The catalyst of the invention is used for catalyzing the addition reaction of n-octene and triethoxysilane, the conversion rate is more than 99%, the product selectivity is more than 95%, the high-yield beta-addition product is obtained, the TON and TOF values are higher, and the product does not contain residual high oxidation state platinum, so that the product quality is better.
The invention has the following beneficial effects:
(1) preparing a nano magnetic polystyrene microsphere with a nitrogen-containing ligand connected to the surface by using a nano magnetic polystyrene chloride sphere, 4- (methylamino) pyridine and NaH, loading a platinum catalyst on the surface of the nano magnetic polystyrene microsphere by using an organic nitrogen-containing ligand, and improving the specific surface area of the platinum catalyst by using the high specific surface area and uniform pore size distribution of the nano magnetic polystyrene microsphere, so that the prepared nano magnetic polystyrene microsphere immobilized platinum catalyst has the characteristics of good chemical stability, good thermodynamic stability and high mechanical strength;
(2) the invention belongs to platinum heterogeneous catalysts, wherein the used raw materials are easy to obtain, the cost is low, the prepared catalyst can be separated from a reaction system in a filtering or centrifuging mode, the separation and purification are simple, and the catalyst can be recycled, so that the invention has the characteristics of easy separation, recycling and low cost;
(3) the catalyst of the invention is used for catalyzing the addition reaction of n-octene and triethoxysilane, the conversion rate is more than 99%, the product selectivity is more than 95%, the high-yield beta-addition product is obtained, the TON and TOF values are higher, and the product does not contain residual high oxidation state platinum, so that the product quality is better.
Drawings
FIG. 1 is a structural formula of a nano magnetic polystyrene microsphere immobilized platinum catalyst in the invention;
FIG. 2 is a structural formula of the nano magnetic polystyrene chloride ball in the invention;
FIG. 3 is a structural formula of 4- (methylamino) pyridine in the present invention;
FIG. 4 is a structural formula of the nano-magnetic polystyrene microsphere with the surface connected with the nitrogen-containing ligand;
FIG. 5 is a graph showing the reaction conversion rate with time in hydrosilylation reaction example 4 in which a polystyrene microsphere supported platinum catalyst is used;
FIG. 6 is a graph showing the reaction conversion rate with time in example 5 of hydrosilylation reaction in which a polystyrene microsphere-supported platinum catalyst was used.
Detailed Description
The invention is further illustrated by the following figures and examples, which are not to be construed as limiting the invention.
The preparation method of the magnetically recoverable supported platinum catalyst shown in figure 1 comprises the following steps,
(1) adding the nano magnetic polystyrene chloride spheres shown in figure 2, 4- (methylamino) pyridine shown in figure 3, NaH and an organic solvent A into a reaction vessel, and stirring and reacting for 12-48 h at the temperature of 0-10 ℃ under the protection of nitrogen;
(2) after the reaction in the step (1) is finished, treating the reaction solution to obtain the nano magnetic polystyrene microsphere with the surface connected with the nitrogen-containing ligand as shown in figure 4;
(3) adding nano magnetic polystyrene microspheres with nitrogen-containing ligands connected to the surfaces and an organic solvent B into a reaction vessel, adding a platinum-containing compound under the protection of nitrogen, and stirring and reacting for 5-10 hours at the temperature of 50-130 ℃;
(4) and (4) after the reaction in the step (3) is finished, filtering the reaction liquid to obtain a solid, and washing and drying the solid to obtain the nano magnetic polystyrene microsphere immobilized platinum catalyst.
The preparation of the nano magnetic polystyrene chloride ball comprises the following steps,
a. adding deionized water into a reaction vessel, adding FeCl into the deionized water3·6H2O and FeSO4·7H2Heating to 70-90 ℃, dropwise adding ammonia water and oleic acid, and reacting for 1-3 h in a heat preservation manner after dropwise adding is completed;
b. after the heat preservation reaction in the step a is finished, filtering out the precipitate, washing the precipitate to be neutral by using deionized water, and drying the neutral precipitate to obtain the nano Fe3O4A magnetic core;
c. b, preparing the nano Fe obtained in the step b3O4Mixing the magnetic core with hexadecane HD with the same mass to obtain nano Fe3O4(ii) a/HD magnetic fluid;
d. c, nano Fe obtained in the step c3O4Mixing the/HD magnetic fluid with styrene, p-chloromethyl styrene and divinylbenzene to form an oil phase;
e. mixing deionized water and lauryl sodium sulfate to form a water phase;
f. dropwise adding the oil phase in the step d into the water phase in the step e under the stirring condition to obtain a black suspension;
g. putting the black suspension liquid obtained in the step f into an ice water bath, and performing fine emulsion for 10-30 min by using a 100-300W cell crusher to obtain fine emulsion;
h. pouring the miniemulsion obtained in step g into a new reaction vessel, and adding K into the reaction vessel2S2O8Stirring and polymerizing for 12-24 hours at the temperature of 60-80 ℃ under the protection of nitrogen to obtain ethanol demulsification;
i. and (5) washing the ethanol in the step h with deionized water, demulsifying, and freeze-drying to obtain the nano magnetic polystyrene chloride balls.
The mole ratio of chlorine contained in the nano magnetic polystyrene chlorine ball to 4- (methylamino) pyridine to NaH is 1: (2-4): (5-7).
The molar ratio of the nitrogen-containing ligand to the platinum-containing compound in the nano magnetic polystyrene microsphere with the surface connected with the nitrogen-containing ligand is 1: (1.2-1.6).
The organic solvent A is N, N-dimethylformamide, toluene, carbon tetrachloride, trichloromethane, ethanol, methanol or tetrahydrofuran; the volume dosage of the organic solvent A is 15-30 mL/g based on the mass of the nano magnetic polystyrene chloride ball.
The organic solvent B is tetrahydrofuran, ethanol, N-dimethylformamide or toluene; the volume consumption of the organic solvent B is 30-35 mL/g based on the mass of the nano magnetic polystyrene microsphere with the nitrogen-containing ligand connected on the surface.
FeSO4·7H2O and FeCl3·6H2The molar ratio of O is 1 (1-2); oleic acid and FeCl3·6H2The molar ratio of O is 1 (7-9); the dropwise adding amount of the ammonia water is based on the condition that the pH range of the reaction solution is kept between 9 and 12.
Nano Fe3O4The mass ratio of the/HD magnetic fluid to the styrene, the p-chloromethyl styrene and the divinylbenzene is 1: (0.5-1): (0.2-0.5): (0.03-0.1); the mass ratio of the sodium dodecyl sulfate to the deionized water is 1: (150-180); sodium dodecyl sulfate and nano Fe3O4The mass ratio of the/HD magnetofluid is 1: (4-8); k2S2O8With nano Fe3O4The mass ratio of the/HD magnetofluid is 1: (130-140).
The nano magnetic polystyrene microsphere immobilized platinum catalyst can be magnetically recycled.
The application of the nano magnetic polystyrene microsphere immobilized platinum catalyst capable of being magnetically recycled in the hydrosilylation reaction.
Example 1:
the preparation method of the magnetically recyclable immobilized platinum catalyst comprises the following steps:
(1) adding 5g of nano magnetic polystyrene chlorine spheres (the crosslinking degree is 7 wt%, the chlorine content is 1.5mmol Cl/g, the average particle size is 60nm), 2.43g of 4- (methylamino) pyridine, 1.08g of NaH and 100mL of methylbenzene into a 250mL flask in sequence, stirring and reacting for 36h at 0 ℃ under the protection of nitrogen, and after the reaction is finished, filtering the reaction solution, washing with ethanol, and carrying out vacuum drying for 24h at 50 ℃ to obtain the nano magnetic polystyrene microspheres with the nitrogen-containing ligands on the surfaces;
(2) 1g of nano magnetic polystyrene microspheres with nitrogen-containing ligands connected to the surfaces and 30mL of tetrahydrofuran are added into a 100mL round-bottom flask, and then 30mL of tetrahydrofuran solution of potassium tetrachloroplatinate (containing 0.7g of potassium tetrachloroplatinate) is added into the flask at 100 ℃ in a nitrogen atmosphere to react for 8 hours. And after the reaction is finished, carrying out vacuum filtration, washing the solid with tetrahydrofuran for three times, wherein the dosage of the tetrahydrofuran is 30mL each time, and then placing the solid in a vacuum drying oven for drying at 60 ℃ for 10h to obtain the organic ligand modified nano magnetic polystyrene microsphere immobilized platinum catalyst.
Example 2:
the preparation method of the magnetically recyclable immobilized platinum catalyst comprises the following steps:
(1) adding 5g of nano magnetic polystyrene chlorine spheres (the crosslinking degree is 7 wt%, the chlorine content is 1.5mmol Cl/g, the average particle size is 60nm), 2.38g of 4- (methylamino) pyridine, 0.87g of NaH and 100mL of methylbenzene into a 250mL flask in sequence, stirring and reacting for 36h at 0 ℃ under the protection of nitrogen, and after the reaction is finished, filtering the reaction solution, washing with ethanol, and carrying out vacuum drying for 24h at 50 ℃ to obtain the nano magnetic polystyrene microspheres with the nitrogen-containing ligands on the surfaces;
(2) 1g of nano magnetic polystyrene microspheres with nitrogen-containing ligands connected to the surfaces and 30mL of tetrahydrofuran are added into a 100mL round-bottom flask, and then 30mL of tetrahydrofuran solution of potassium tetrachloroplatinate (containing 0.7g of potassium tetrachloroplatinate) is added into the flask at 80 ℃ in a nitrogen atmosphere to react for 8 hours. And after the reaction is finished, carrying out vacuum filtration, washing the solid with ethanol for three times, wherein the dosage of ethanol is 30mL each time, and then placing the solid in a vacuum drying oven for drying at 60 ℃ for 10h to obtain the nano magnetic polystyrene microsphere immobilized platinum catalyst.
Example 3:
the preparation method of the magnetically recyclable immobilized platinum catalyst comprises the following steps:
(1) adding 5g of nano magnetic polystyrene chlorine spheres (the crosslinking degree is 7 wt%, the chlorine content is 1.5mmol Cl/g, the average particle size is 60nm), 2.43g of 4- (methylamino) pyridine, 1.08g of NaH and 100mLN, N-dimethylformamide into a 250mL flask in sequence, stirring and reacting for 36h at 0 ℃ under the protection of nitrogen, and after the reaction is finished, filtering the reaction solution, washing with ethanol, and vacuum-drying for 24h at 50 ℃ to obtain the nano magnetic polystyrene microspheres with the nitrogen-containing ligands on the surfaces;
(2) 1g of nano magnetic polystyrene microspheres with nitrogen-containing ligands attached to the surfaces and 30mL of toluene are added into a 100mL round-bottom flask, and then 30mL of a toluene solution of potassium tetrachloroplatinate (containing 0.7g of potassium tetrachloroplatinate) is added into the flask at 80 ℃ in a nitrogen atmosphere to react for 8 hours. And after the reaction is finished, carrying out vacuum filtration, washing the solid with ethanol for three times, wherein the dosage of ethanol is 30mL each time, and then placing the solid in a vacuum drying oven for drying at 60 ℃ for 10h to obtain the nano magnetic polystyrene microsphere immobilized platinum catalyst.
Example 4:
the application of the magnetically recyclable nano magnetic polystyrene microsphere immobilized platinum catalyst in the hydrosilylation reaction comprises the following steps:
0.1g of the nano-magnetic polystyrene microsphere platinum-supported catalyst prepared in example 1 was added to 5g of n-octene, and magnetically stirred at 60 ℃ for 30min under a sealed condition. Then 12.6g of triethoxysilane was added, the reaction was magnetically stirred at 60 ℃ under sealed conditions, and samples were taken at 0, 5, 10, 15, 20, 25, and 30min for GC tests to obtain the change of the reaction conversion rate with time, and the results are shown in FIG. 5. It can be seen that under the catalytic condition of the catalyst prepared in example 1, the conversion rate of n-octene can reach 100% after 30min of reaction.
Example 5:
the application of the magnetically recyclable nano magnetic polystyrene microsphere immobilized platinum catalyst in the hydrosilylation reaction comprises the following steps:
0.1g of the nano-magnetic polystyrene microsphere platinum-supported catalyst prepared in example 3 was added to 5g of n-octene, and magnetically stirred at 60 ℃ for 30min under a sealed condition. Then 12.6g of triethoxysilane was added, the reaction was magnetically stirred at 60 ℃ under sealed conditions, and samples were taken at 0, 5, 10, 15, 20, 25, and 30min for GC tests to obtain the change of the reaction conversion rate with time, and the results are shown in FIG. 6. It can be seen that under the catalytic condition of the catalyst prepared in example 3, the conversion rate of n-octene can reach 81% after 30min of reaction.
And (3) centrifugally separating the reaction solution after the catalytic reaction to obtain a nano magnetic polystyrene microsphere immobilized platinum catalyst containing the organic nitrogen-containing ligand on the surface, and repeatedly using the catalyst in the hydrosilylation reaction of the n-octene for 8 times, wherein the conversion rate of each catalytic reaction is more than 96%.
Claims (10)
1. The preparation method of the magnetically recyclable immobilized platinum catalyst is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
(1) adding a nano magnetic polystyrene chloride ball, 4- (methylamino) pyridine, NaH and an organic solvent A into a reaction container, and stirring and reacting for 12-48 h at the temperature of 0-10 ℃ under the protection of nitrogen;
(2) after the reaction in the step (1) is finished, treating the reaction liquid to obtain the nano magnetic polystyrene microsphere with the surface connected with the nitrogen-containing ligand;
(3) adding nano magnetic polystyrene microspheres with nitrogen-containing ligands connected to the surfaces and an organic solvent B into a reaction vessel, adding a platinum-containing compound under the protection of nitrogen, and stirring and reacting for 5-10 hours at the temperature of 50-130 ℃;
(4) and (4) after the reaction in the step (3) is finished, filtering the reaction liquid to obtain a solid, and washing and drying the solid to obtain the nano magnetic polystyrene microsphere immobilized platinum catalyst.
2. The method for preparing a magnetically recoverable supported platinum catalyst as claimed in claim 1, wherein the method comprises the steps of: the preparation of the nano magnetic polystyrene chloride ball comprises the following steps,
a. adding deionized water into a reaction vessel, and adding FeCl into the deionized water3·6H2O and FeSO4·7H2Heating to 70-90 ℃, dropwise adding ammonia water and oleic acid, and reacting for 1-3 h in a heat preservation manner after dropwise adding is completed;
b. after the heat preservation reaction in the step a is finished, filtering out the precipitate, washing the precipitate to be neutral by using deionized water, and drying the neutral precipitate to obtain the nano Fe3O4A magnetic core;
c. b, preparing the nano Fe obtained in the step b3O4Mixing the magnetic core with hexadecane HD with the same mass to obtain nano Fe3O4(ii) a/HD magnetic fluid;
d. c, nano Fe obtained in the step c3O4Mixing the/HD magnetic fluid with styrene, p-chloromethyl styrene and divinylbenzene to form an oil phase;
e. mixing deionized water and lauryl sodium sulfate to form a water phase;
f. dropwise adding the oil phase in the step d into the water phase in the step e under the stirring condition to obtain a black suspension;
g. putting the black suspension liquid obtained in the step f into an ice water bath, and performing fine emulsion for 10-30 min by using a 100-300W cell crusher to obtain fine emulsion;
h. pouring the miniemulsion obtained in step g into a new reaction vessel, and adding K into the reaction vessel2S2O8Stirring and polymerizing for 12-24 hours at the temperature of 60-80 ℃ under the protection of nitrogen to obtain ethanol demulsification;
i. and (5) washing the ethanol in the step h with deionized water, demulsifying, and freeze-drying to obtain the nano magnetic polystyrene chloride balls.
3. The method for preparing a magnetically recoverable supported platinum catalyst as claimed in claim 1, wherein the method comprises the steps of: the mole ratio of chlorine contained in the nano magnetic polystyrene chlorine ball to 4- (methylamino) pyridine to NaH is 1: (2-4): (5-7).
4. The method for preparing a magnetically recoverable supported platinum catalyst as claimed in claim 1, wherein the method comprises the steps of: the molar ratio of the nitrogen-containing ligand to the platinum-containing compound in the nano magnetic polystyrene microsphere with the surface connected with the nitrogen-containing ligand is 1: (1.2-1.6).
5. The method for preparing a magnetically recoverable supported platinum catalyst as claimed in claim 1, wherein the method comprises the steps of: the organic solvent A is N, N-dimethylformamide, toluene, carbon tetrachloride, trichloromethane, ethanol, methanol or tetrahydrofuran; the volume dosage of the organic solvent A is 15-30 mL/g based on the mass of the nano magnetic polystyrene chloride ball.
6. The method for preparing a magnetically recoverable supported platinum catalyst as claimed in claim 1, wherein the method comprises the steps of: the organic solvent B is tetrahydrofuran, ethanol, N-dimethylformamide or toluene; and the volume dosage of the organic solvent B is 30-35 mL/g based on the mass of the nano magnetic polystyrene microsphere with the surface connected with the nitrogen-containing ligand.
7. The method for preparing a magnetically recoverable supported platinum catalyst as claimed in claim 2, wherein the method comprises the steps of: the FeSO4·7H2O and FeCl3·6H2The molar ratio of O is 1 (1-2); the oleic acid and FeCl3·6H2The molar ratio of O is 1 (7-9); the dropwise adding amount of the ammonia water is based on the condition that the pH range of the reaction solution is kept to be 9-12.
8. The method for preparing a magnetically recoverable supported platinum catalyst as claimed in claim 2, wherein the method comprises the steps of: the nano Fe3O4The mass ratio of the/HD magnetic fluid to the styrene, the p-chloromethyl styrene and the divinylbenzene is 1: (0.5-1): (0.2-0.5): (0.03-0.1); the mass ratio of the sodium dodecyl sulfate to the deionized water is 1: (150-180); the sodium dodecyl sulfate and the nano Fe3O4The mass ratio of the/HD magnetofluid is 1: (4-8); said K2S2O8With nano Fe3O4The mass ratio of the/HD magnetofluid is 1: (130-140).
9. The magnetically recoverable nanometer magnetic polystyrene microsphere immobilized platinum catalyst is characterized in that: prepared by the preparation method of any one of claims 1 to 8.
10. The application of the nano magnetic polystyrene microsphere immobilized platinum catalyst capable of being magnetically recycled in the hydrosilylation reaction.
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Application publication date: 20201225 |