GB2045637A - A support matrix for catalysts - Google Patents
A support matrix for catalysts Download PDFInfo
- Publication number
- GB2045637A GB2045637A GB8006939A GB8006939A GB2045637A GB 2045637 A GB2045637 A GB 2045637A GB 8006939 A GB8006939 A GB 8006939A GB 8006939 A GB8006939 A GB 8006939A GB 2045637 A GB2045637 A GB 2045637A
- Authority
- GB
- United Kingdom
- Prior art keywords
- screen cloth
- support matrix
- layers
- flat
- closed hollow
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000011159 matrix material Substances 0.000 title claims abstract description 35
- 239000003054 catalyst Substances 0.000 title claims abstract description 21
- 239000004744 fabric Substances 0.000 claims abstract description 35
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 19
- 239000010959 steel Substances 0.000 claims abstract description 19
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 54
- 239000010410 layer Substances 0.000 claims description 30
- 239000000463 material Substances 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 15
- 229910045601 alloy Inorganic materials 0.000 claims description 11
- 239000000956 alloy Substances 0.000 claims description 11
- 239000004411 aluminium Substances 0.000 claims description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 11
- 229910052782 aluminium Inorganic materials 0.000 claims description 9
- 239000007789 gas Substances 0.000 claims description 9
- 229910052684 Cerium Inorganic materials 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 239000006185 dispersion Substances 0.000 claims description 8
- 239000011651 chromium Substances 0.000 claims description 7
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 229910044991 metal oxide Inorganic materials 0.000 claims description 5
- 150000004706 metal oxides Chemical class 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 229910052727 yttrium Inorganic materials 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 230000003647 oxidation Effects 0.000 claims description 4
- 238000007254 oxidation reaction Methods 0.000 claims description 4
- 239000002344 surface layer Substances 0.000 claims description 4
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 229910000838 Al alloy Inorganic materials 0.000 claims description 2
- 229910000599 Cr alloy Inorganic materials 0.000 claims description 2
- 229910000640 Fe alloy Inorganic materials 0.000 claims description 2
- 239000010953 base metal Substances 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000007598 dipping method Methods 0.000 claims description 2
- 238000010894 electron beam technology Methods 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims description 2
- 230000014759 maintenance of location Effects 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 229910000510 noble metal Inorganic materials 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims 2
- ZMIGMASIKSOYAM-UHFFFAOYSA-N cerium Chemical compound [Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce] ZMIGMASIKSOYAM-UHFFFAOYSA-N 0.000 description 6
- 229910052726 zirconium Inorganic materials 0.000 description 5
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 4
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 4
- 238000001354 calcination Methods 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910052788 barium Inorganic materials 0.000 description 2
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 2
- 229910000421 cerium(III) oxide Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229920002873 Polyethylenimine Polymers 0.000 description 1
- 229910052776 Thorium Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910052768 actinide Inorganic materials 0.000 description 1
- 150000001255 actinides Chemical class 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 229910021502 aluminium hydroxide Inorganic materials 0.000 description 1
- 159000000013 aluminium salts Chemical class 0.000 description 1
- PZZYQPZGQPZBDN-UHFFFAOYSA-N aluminium silicate Chemical compound O=[Al]O[Si](=O)O[Al]=O PZZYQPZGQPZBDN-UHFFFAOYSA-N 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 229910000329 aluminium sulfate Inorganic materials 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 description 1
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 description 1
- 238000000975 co-precipitation Methods 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 229910052747 lanthanoid Inorganic materials 0.000 description 1
- 150000002602 lanthanoids Chemical class 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- QWDUNBOWGVRUCG-UHFFFAOYSA-N n-(4-chloro-2-nitrophenyl)acetamide Chemical compound CC(=O)NC1=CC=C(Cl)C=C1[N+]([O-])=O QWDUNBOWGVRUCG-UHFFFAOYSA-N 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 229910052706 scandium Inorganic materials 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 229910021332 silicide Inorganic materials 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
-
- 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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
- B01J35/58—Fabrics or filaments
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biomedical Technology (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Health & Medical Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Catalysts (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
A catalyst support matrix comprises the layers of high-temperature- resistant, non-scaling steel arranged one on top of the other, the layers consisting of a flat screen cloth into which or onto which closed hollow or open supporting profiles having a larger cross-section than the screen cloth are woven at parallel intervals. Layers of screen cloth provided with the profiles may be combined with layers of flat screen cloth or flat or corrugated sheet steel. The matrix may be in the form of a cylinder of spirally wound cloth, optionally wound together with another sheet of flat screen cloth or flat or corrugated sheet steel.
Description
SPECIFICATION
An improved support matrix for catalysts
This invention relates to an improved catalyst support matrix which has a crossflow effect and an increased geometric surface coupled with an improved retention capacity for catalysis-promoting metal oxides present in dipping dispersions according to German Offenlegungsschrift No. 28 53 547.
The embodiments disclosed in the above
Offenlegungsschrift include a catalyst support matrix which consists of layers of high-temperature-resistant, non-scaling steel arranged one on top of the other, the layers consisting of a flat screen cloth into which or onto which supporting wires having a larger cross-section than the screen cloth are woven at parallel intervals in the direction of the required flow passages or layers of flat screen cloth or flat or corrugated sheet steel alternating with layers of flat screen cloth containing supporting wires correspondingly woven in or on.
It has now been found that this support matrix may be improved in regard to weight, stability and pressure loss by making the above-mentioned supporting wires in the form of closed hollow or open supporting profiles.
Open and closed hollow supporting profiles afford the addition advantage of an increased geometric surface of the support matrix. The closed hollow supporting profiles may have any cross-sections, i.e. they may be in the form of, for example, round, square, elliptical, rectangular and flat tubes. The open supporting profiles may also have any one of these cross-sections. In this way, a wide margin is left for obtaining favourable static stability.
A closed hollow supporting profile is understood to be a profile having a closed surface but open ends. The open supporting profile has an open surface and is of course also open at its ends.
Modifications of the improved matrix may be based on any of the variants disclosed in
German Offenlegungsschrift No. 28 53 547.
Accordingly, a web-form screen cloth provided with the new closed hollow or open supporting profiles may be wound, optionally together with another web of flat or corrugated screen cloth or sheet steel, to form a spiral cylinder containing numerous flow passages.
The screen cloth may be a web having a mesh width of from 0. 18 to 0.025 mm, preferably from 0.1 to 0.05 mm and, more particularly, of 0.073 mm and a wire thickness of from 0. 15 to 0.025 mm, preferably from 0.1 to 0.05 mm and, more particularly, of 0.07 mm.
It has proved to be of advantage for the closed hollow open supporting profile to have a cross-section of less than 5 mm2, the particular cross-section to be selected being determined by the required dimensions of the flow passages and also by the wire thickness of the screen cloth.
It has also proved to be of advantage for the individual flow passages created by the gap-forming, woven-in, closed hollow or open supporting profiles to have a cross-section of less than 5 mm2 and for the supporting profiles to be situated at least 1 mm and at most 5 mm apart from one another in the plane of the web-form screen cloth.
Steel sheets, screen cloths and closed hollow and open profiles consisting of an alloy of iron, chromium, aluminium and, optionally, cerium or yttrium are particularly suitable for the improved support matrix. A support matrix consisting of an alloy of 15% by weight of chromium, 5% by weight of aluminium, remainder iron, has proved to be suitable for catalytically cleaning the exhaust gases of internal combustion engines. An alloy of up to 15% by weight of chromium, 0.5 to 12% by weight of aluminium, 0.1 to 3% by weight of cerium or yttrium, remainder iron, has also proved to be of advantage in this respect.By heating in an oxidising gas, alloys such as these may be provided with a surface layer of aluminium oxide which, in some cases, favourably influences the adhesion of catalyst masses to be applied.
In another embodiment which is suitable for the described version of the support matrix according to the invention, the individual layers are spot-welded or continuously welded at their peripheries and/or ends or the last layer is welded to the preceding layer, for which purpose it is particularly favourable to use electron-beam welding.
The invention also relates to a support matrix corresponding to the described version which is coated with a conventional support material for catalysts and which may be directly impregnated with solutions of active catalyst metals. In this case, the layers are surface-coated with a catalysis-promoting support material, generally a large-surface metal oxide. In practice, these suport matrixes according to the invention coated with support material are preferably arranged as wound cylinders of spiral cross-section in a steel jacket in which they are clamped and/or welded. Another possibility for fixing the individual layers is fixedly to arrange holding crosses or holding webs on the internal diameter of a, for example, cylindrical steel jacket or housing or on the converter cones, for example by welding them to one of the two components.In this way, the individual spirally wound layers are prevented from shifting longitudinally of their axis.
The support matrixes which may be directly impregnated with catalyst substances are prduced by a process in which the surface of the flat and corrugated layers or the web-form screen cloth provided with the closed hollow or open supporting profiles is coated with a catalysis-promoting support material before being wound to form the cylinder.
The catalysis-promoting support material is applied by coating processes known per se.
To this end, a heat-resistant, catalysis-promoting support material having a relative large specific surface is applied by bringing the surfaces to be coated into contact with the aqueous dispersion of the support material or with a solution of a salt which may be thermally converted into the support material and, after the removal of excess dispersion or solution, followed by drying, calcining the surfaces thus coated at temperatures generally above 450 C, these operations optionally being carried out several times. Basically, it is possible to use any heat-resistant support material of the type normally employed for catalysts.Thus, the surfaces to be coated may be brought into contact with an aqueous dispersion of at least one compound from the group of oxides of Mg, Ca, Sr, Ba, Al, Sc, Y, the lanthanides, the actinides, Ga, In, TI, Si,
Ti, Zr, Hf, Th, Ge, Sn, Pb, V, Nb, Ta, Cr, Mo,
W, and the carbides, borides and silicides of the transition metals. It is preferred to use those heat-resistant catalyst support materials which synergistically promote the effect of the actual catlytically active component. Examples of catalyst support materials such as these are single or composite oxides, such as active Al203, ZrO2, Ce203, SiO2, TiO #silicates, such as barium, boron or aluminium silicate, and titanates, such as barium or aluminium titanate.
The heat-resistant support material used in practice may be in particular any of the various phases of active aluminium oxide which are collectively known as active aluminium oxide of the gamma series (y-, ss-, 8-, or c- and X-AI203). This aluminium oxide may be combined or doped with certain elements which stabilise its crystal structure or increase the oxygen uptake capacity of the catalyst as a whole.In one preferred embodiment of the process according to the invention, therefore, the surface of the tempered structural reinforcement is brought into contact with an aqueous dispersion of aluminium oxide of the gamma series or its hydroxide or oxide hydrate preliminary stages optionally contaning one or more salts of elements of the llnd, Illrd and IVth Main and Secondary Groups of the
Periodic System. However, any other compound or preliminary stage which has a synergistic effect with respect to the catalytically active component may also be applied to the reinforcement in the form of a dispersion.
In the treatment of vehicle exhaust gases for example, the doping of aluminium oxide of the gamma series with the elements cerium and/or zirconium has a favourable effect on long-term activity and, in addition, affords advantages in cases where the pollutants of internal combustion engines are simultaneously oxidised or reduced in a single catalyst bed. To introduce these doping elements into the aluminium oxide lattice, it has proved to be best to prepare an aluminium hydroxide or oxide hydrate preliminary stage containing the elements cerium and/or zirconium by co-precipitation from solutions contaning cerium, zirconium and, optionally, aluminium salt and subsequently to calcine the preliminary stage to form the gamma-aluminium oxide/ceriumzirconium oxide matrix.Alternatively, it is possible to apply a calcined AI203 of the gamma series which contains Ce203 or CeO2 and/or
ZrO2 or salts of trivalent or tetravalent cerium and/or zirconium, followed by calcination at a temperature of from 500 to 900 C before or after application of the catalytically active component. Calcination is preferably carried out before application of the catalytically active component. The dispersion of the heatresistant support material is prepared by known techniques, such as grinding, addition of antisedimentation aids, such as polyethylene imines and ammonium salts of polymeric carboxylic acids stabilised through the pHvalue (German Auslegeschrift No.
2,531,769), and ageing processes.
In a variant of the process favourably distinguished by its positive effect on the adhesion of certain catalysis-promoting support materials, the flat and corrugated layers or the web-form screen cloth provided with the closed hollow or open supporting profiles is heated in an oxygen-containing gas under such temperature and time conditions that a surface layer of aluminium oxide is formed from the aluminium present in the alloy. After formation of this aluminium oxide coating, the flat and corrugated layers or the web-form screen cloth provided with the closed hollow or open supporting profiles may be washcoated with another catalysis-promoting support material having the same or a different composition.
However, the flat and corrugated layers or the web4orm screen cloth provided with the closed hollow or open supporting profiles may also be initially wash-coated with a catalysispromoting support material and the material thus coated subsequently heated in an oxygen-containing gas under such temperature and time conditions that aluminium oxide is formed by oxidation from the aluminium present in the alloy.
To form the surface layer of aluminium oxide, it is sufficient to form aluminium oxide
by oxidation from the alloy by heating in air at temperatures in the range from 750 to 1 100'C and preferably in the range from 500 to 1 000 C, preferably over a period of from 1 to 7 hours and, more particularly, over a
period of around 4 hours.
The coated flat and corrugated layers or the web-form screen cloth provided with the closed hollow or open supporting profiles may be wound to form the cylinder of spiral crosssection which may then be pressed under bias into a steel jacket and optionally welded therein. Accordingly, the present invention also relates to a cylindrical support matrix of spiral cross-section coated with a firmly adhering catalysis-promoting metal oxide and optionally reinforced by a steel jacket obtainable by the process measures described above.
Finally, the present invention relates to the use of the described support matrix for the production of catalysts, preferaby noble metal and/or base metal catalysts, which are deposited onto a catalysis-promoting support material as an intermediate support, more particularly for cleaning the exhaust gases of internal combustion engines and industrial installations.
Claims (28)
1. An imroved catalyst support matrix having a crossflow effect, an increased geometric surface and an improved retention capacity for catalysis-promoting metal oxides present in dipping dispersions, comprising layers of high-temperature-resistant, non-scaling steel arranged one on top of the other, the layers consisting of a flat screen cloth into which or onto which closed hollow or open supporting profiles having a larger cross-section than the screen cloth are woven at parallel intervals in the direction of the required flow passages or layers of flat screen cloth or flat or corrugated sheet steel alternating with layers of flat screen cloth comprising closed hollow or open supporting profiles correspndingly woven in or on.
2. A support matrix as claimed in Claim 1, wherein a web-form screen cloth provided with closed hollow or open-supporting profiles is wound, optionally together with another flat or corrugated sheet of screen cloth or steel, to form a cylinder or spiral cross-section incorporating numerous flow passages.
3. A support matrix as claimed in Claim 1 or 2, wherein the screen cloth is a web having a mesh width of from 0.18 to 0.025 mm, and a wire thickness of from 0.15 to 0.025 mm.
4. A support matrix as claimed in claim 3, wherein the mesh width is from 0.1 to 0.05 mm and the wire thickness from 0.1 to 0.05 mm.
5. A support matrix as claimed in claim 4, wherein the mesh width is 0.073 mm and the wire thickness is 0.07 mm.
6. A support matrix as claimed in any of
Claims 1 to 5, wherein the cross-section of the closed hollow or open supporting profile measures less than 5 mm2, the particular cross-section being determined by the required dimensions of the flow passages and by the wire thickness of the screen cloth.
7. A support matrix as claimed in any of
Claims 1 to 6, wherein the individual flow passages formed by the gap-forming, wovenin, closed hollow or open supporting profiles have a cross-section of less than 5 mm2.
8. A support matrix as claimed in any of
Claims 1 to 7, wherein the closed hollow or open supporting profiles are at least 1 mm and at most 5 mm apart in the plane of the screen cloth.
9. A support matrix as claimed in any of
Claims 1 to 8, wherein the sheet steel, screen cloth and closed hollow or open supporting profiles consist of an alloy of iron, chromium, aluminium and, optionally, cerium or yttrium.
10. A support matrix as claimed in Claim 9, wherein the alloy consists of 15% by weight of chromium, 5% by weight of aluminium, remainder iron.
11. A support matrix as claimed in Claim 9, wherein the alloy consists of up to 15% by weight of chromium, from 0.5 to 2% by weight of aluminium, from 0.1 to 3% by weight of cerium or yttrium, remainder iron.
12. A support matrix as claimed in any of
Claims 1 to 11, wherein the individual layers are spot-welded or continuously welded at their peripheries and/or ends or the last layer is welded to the preceding layer.
13. A support matrix as claimed in Claim 12, wherein the layers are joined by electronbeam welding.
14. A support matrix as claimed in any of
Claims 1 to 13, wherein the layers are surface-coated with a catalysis-promoting support material.
15. A support matrix as claimed in any of
Claims 1 to 14, arranged in the form of a spirally wound cylinder in a steel jacket clamed and/or welded therein.
16. A support matrix as claimed in any of
Claims 1 to 15, wherein the individual spirally would layers are prevented from shifting by means of holding crosses fixedly arranged at the ends of the steel jacket.
17. A process for producing a support matrix as claimed in Claim 14 or 15, wherein the surface of the flat and corrugated layers or the web-form screen cloth provided with the closed hollow or open supporting profiles is coated with a catalysis-promoting support material before being wound to form the cylinder.
18. A process as claimed in Claim 17, wherein the flat and corrugated layers or the web-form screen cloth provided with the closed hollow or open supporting profiles is heated in an oxygen-containing gas under such temperature and time conditions that a surface layer of aluminium oxide is formed from the aluminium present in the alloy.
19. A process as claimed in Claim 18, wherein after formation of the aluminium oxide coating, the flat and corrugated layers or the web-form screen cloth provided with the closed hollow or open supporting profiles is wash-coated with another catalysis-promoting support material having the same or a different chemical composition.
20. A process as claimed in Claim 17, wherein the flat and corrugated layers or the webform screen cloth provided with the closed hollow or open supporting profiles is first wash-coated with catalysis-promoting support material, after which the coated material is heated in an oxygen-containing gas under such time and temperature conditions that aluminium oxide is formed by oxidation from the aluminium present in the alloy.
21. A process as claimed in any of Claims 18 to 20, wherein aluminium oxide is formed by oxidation from the alloy by heating in air at a temperature in the range from 750 to 1 lOOC.
22. A process as claimed in claim 21, wherein heating takes place at 900 to 1000 C over a period of from 1 to 7 hours.
23. A process as claimed in claim 21 or 22, wherein heating takes place over a period of around 4 hours.
24. A process as claimed in any of Claims 17 to 23, wherein the flat and corrugated layers or the web-form screen cloth provided with a closed hollow or open supporting profiles is wound to form a spiral cylinder which is then pressed under bias into a steel jacket and optionally welded therein.
25. A cylindrical support matrix of spiral cross-section provided with a firmly adhering coating of catalysis-promoting metal oxide and optionally reinforced by a steel jacket, when obtained by the process claimed in Claims 17 to 24.
26. A catalyst including an improved support matrix as claimed in any of Claims 1 to 16 or 25.
27. A catalyst as claimed in Claim 26 wherein a noble metal and/or base metal catalyst is deposited onto a catalysis-promoting support material as intermediate support.
28. A catalyst as claimed in claim 26 or 27 adapted for cleaning the exhaust gases of internal combustion engines and industrial installations.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19792908671 DE2908671A1 (en) | 1979-03-06 | 1979-03-06 | IMPROVED CARRIER MATRIX FOR CATALYSTS |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2045637A true GB2045637A (en) | 1980-11-05 |
| GB2045637B GB2045637B (en) | 1983-08-17 |
Family
ID=6064603
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8006939A Expired GB2045637B (en) | 1979-03-06 | 1980-02-29 | Support materix for catalysts |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS55121838A (en) |
| DE (1) | DE2908671A1 (en) |
| GB (1) | GB2045637B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0634213A1 (en) * | 1993-07-13 | 1995-01-18 | Institut Francais Du Petrole | Catalyst containing an assebly of at least one thread and use thereof for combustion or post-combustion |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3116967A1 (en) * | 1981-04-29 | 1982-11-18 | Degussa Ag, 6000 Frankfurt | Method of brazing a wound body to a casing |
| DE3406507A1 (en) * | 1984-02-23 | 1985-09-12 | Peter 4700 Hamm Rössler | Interference/absorption silencer system with simultaneous catalytic afterburning for internal combustion engines |
| US4708946A (en) * | 1985-05-23 | 1987-11-24 | Nippon Shokubai Kagaku Kogyo Co., Ltd. | Catalyst for purifying exhaust gas |
| DE8715289U1 (en) * | 1987-11-18 | 1988-01-14 | Emitec Gesellschaft für Emissionstechnologie mbH, 53797 Lohmar | Carrier body for a catalytic reactor for exhaust gas purification |
| DE10005663A1 (en) | 2000-02-09 | 2001-08-23 | Basf Ag | Catalyst packing used in reactors comprises stacking layers of ready-made woven or knitted fabric in the form or an endless strip arranged vertically to the main flow direction of the reactor |
| JP6207106B2 (en) * | 2016-03-31 | 2017-10-04 | 三恵技研工業株式会社 | Catalyst carrier, method for producing the same, and exhaust purification device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4816040B1 (en) * | 1970-05-15 | 1973-05-18 | ||
| JPS4816040U (en) * | 1971-07-06 | 1973-02-23 | ||
| DE2302746A1 (en) * | 1973-01-20 | 1974-07-25 | Sueddeutsche Kuehler Behr | CARRIER MATRIX FOR A CATALYTIC REACTOR FOR EXHAUST GAS CLEANING IN COMBUSTION MACHINES, ESPEC. GASOLINE ENGINES OF MOTOR VEHICLES AND A MANUFACTURING PROCESS |
| JPS5739714Y2 (en) * | 1974-06-24 | 1982-09-01 | ||
| JPS52129692A (en) * | 1976-04-24 | 1977-10-31 | Nippon Sheet Glass Co Ltd | Honeycomb catalyst structures |
-
1979
- 1979-03-06 DE DE19792908671 patent/DE2908671A1/en active Granted
-
1980
- 1980-02-29 GB GB8006939A patent/GB2045637B/en not_active Expired
- 1980-03-06 JP JP2745980A patent/JPS55121838A/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0634213A1 (en) * | 1993-07-13 | 1995-01-18 | Institut Francais Du Petrole | Catalyst containing an assebly of at least one thread and use thereof for combustion or post-combustion |
| FR2707527A1 (en) * | 1993-07-13 | 1995-01-20 | Inst Francais Du Petrole | Catalyst comprising an assembly of at least one wire and its use in combustion or post-combustion. |
| US5565401A (en) * | 1993-07-13 | 1996-10-15 | Institut Francais Du Petrole | Catalyst comprising an assembly of at least one wire and its use in combustion or in post-combustion |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6260141B2 (en) | 1987-12-15 |
| DE2908671C2 (en) | 1987-07-02 |
| JPS55121838A (en) | 1980-09-19 |
| DE2908671A1 (en) | 1980-09-25 |
| GB2045637B (en) | 1983-08-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19940228 |