CN108855044B - A kind of preparation method of vanadium-tungsten catalyst - Google Patents
A kind of preparation method of vanadium-tungsten catalyst Download PDFInfo
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- 239000003054 catalyst Substances 0.000 title claims abstract description 52
- NWJUARNXABNMDW-UHFFFAOYSA-N tungsten vanadium Chemical compound [W]=[V] NWJUARNXABNMDW-UHFFFAOYSA-N 0.000 title claims abstract description 14
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000000243 solution Substances 0.000 claims abstract description 41
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000003756 stirring Methods 0.000 claims abstract description 20
- 238000006243 chemical reaction Methods 0.000 claims abstract description 16
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 11
- 235000006408 oxalic acid Nutrition 0.000 claims abstract description 11
- 150000003681 vanadium Chemical class 0.000 claims abstract description 11
- PBYZMCDFOULPGH-UHFFFAOYSA-N tungstate Chemical compound [O-][W]([O-])(=O)=O PBYZMCDFOULPGH-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 5
- 239000011259 mixed solution Substances 0.000 claims abstract description 3
- 239000008367 deionised water Substances 0.000 claims description 20
- 229910021641 deionized water Inorganic materials 0.000 claims description 20
- 239000002244 precipitate Substances 0.000 claims description 14
- 238000001035 drying Methods 0.000 claims description 11
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 11
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 8
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical group [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 8
- UUUGYDOQQLOJQA-UHFFFAOYSA-L vanadyl sulfate Chemical group [V+2]=O.[O-]S([O-])(=O)=O UUUGYDOQQLOJQA-UHFFFAOYSA-L 0.000 claims description 8
- 229940041260 vanadyl sulfate Drugs 0.000 claims description 8
- 229910000352 vanadyl sulfate Inorganic materials 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 8
- 239000012065 filter cake Substances 0.000 claims description 4
- 239000000047 product Substances 0.000 claims description 4
- 229910003082 TiO2-SiO2 Inorganic materials 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- OGUCKKLSDGRKSH-UHFFFAOYSA-N oxalic acid oxovanadium Chemical compound [V].[O].C(C(=O)O)(=O)O OGUCKKLSDGRKSH-UHFFFAOYSA-N 0.000 claims description 2
- WIWVNQBYNTWQOW-UHFFFAOYSA-L oxovanadium(2+);diacetate Chemical compound [V+2]=O.CC([O-])=O.CC([O-])=O WIWVNQBYNTWQOW-UHFFFAOYSA-L 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- XMVONEAAOPAGAO-UHFFFAOYSA-N sodium tungstate Chemical compound [Na+].[Na+].[O-][W]([O-])(=O)=O XMVONEAAOPAGAO-UHFFFAOYSA-N 0.000 claims description 2
- 239000000203 mixture Substances 0.000 abstract description 3
- 229910010413 TiO 2 Inorganic materials 0.000 abstract 2
- 229910004298 SiO 2 Inorganic materials 0.000 abstract 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 38
- 239000007789 gas Substances 0.000 description 7
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 6
- 239000000843 powder Substances 0.000 description 6
- 230000003197 catalytic effect Effects 0.000 description 5
- 238000011068 loading method Methods 0.000 description 5
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910000314 transition metal oxide Inorganic materials 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910052684 Cerium Inorganic materials 0.000 description 1
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000003837 high-temperature calcination Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 231100000167 toxic agent Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
Classifications
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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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/002—Mixed oxides other than spinels, e.g. perovskite
-
- 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
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8628—Processes characterised by a specific catalyst
-
- 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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/24—Chromium, molybdenum or tungsten
- B01J23/30—Tungsten
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
-
- 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
- B01J2523/00—Constitutive chemical elements of heterogeneous catalysts
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Catalysts (AREA)
Abstract
本发明公开了一种钒钨催化剂的制备方法，一种钒钨催化剂的制备方法，其特征在于：所述的方法按照如下步骤进行制备：将适量钒盐、钨酸盐与草酸溶于去离子水中，常温搅拌反应完全，然后向所得混合液中加入载体TiO2或TiO2‑SiO2，混合均匀得到溶液A，向所得溶液A中缓慢滴加入氨水搅拌至pH＝7‑10为止，所得浑浊液B经后处理得到目标产物钒钨催化剂。本发明所述的制备方法可以在低温乃至室温下制备钒钨催化剂而无需高温焙烧，从而大大节约催化剂制备所需的能量，环境友好。所得催化剂组成分布更为均匀，性能稳定，具有良好的应用前景。The invention discloses a preparation method of vanadium-tungsten catalyst, and a preparation method of vanadium-tungsten catalyst, which is characterized in that: the method is prepared according to the following steps: dissolving an appropriate amount of vanadium salt, tungstate and oxalic acid in deionized In water, the stirring reaction at room temperature is complete, then add carrier TiO 2 or TiO 2 -SiO 2 to the obtained mixed solution, mix well to obtain solution A, slowly add aqueous ammonia to the obtained solution A and stir until pH=7-10, the obtained solution is turbid Liquid B is post-treated to obtain the target product vanadium-tungsten catalyst. The preparation method of the present invention can prepare the vanadium-tungsten catalyst at low temperature or even room temperature without high-temperature roasting, thereby greatly saving the energy required for the preparation of the catalyst and being environmentally friendly. The obtained catalyst has more uniform composition distribution, stable performance and good application prospect.
Description
Technical Field
The invention belongs to the technical field of environmental catalytic flue gas denitration, and relates to a low-temperature preparation method of a vanadium-tungsten catalyst.
Background
Nitrogen oxides NOxIs one of the main atmospheric pollutants, mainly comprising N2O，NO，NO2And the like. Nitrogen Oxides (NO) of internal combustion engines of automobiles, coal-fired power plants and industrial reaction furnacesx) The main source of emissions. At present, NH3SCR as an efficient NO removalxHas been widely applied to control the emission of nitrogen oxides. NH (NH)3the-SCR catalyst mainly comprises a noble metal catalyst, a transition metal oxide catalyst, a molecular sieve catalyst and the like. Among them, the most representative catalyst is V which has been widely commercialized2O5-WO3/TiO2The catalyst has good catalytic activity and sulfur-resistant and water-resistant performance in a temperature window of 300-400 ℃. At V2O5-WO3/TiO2V in the catalyst2O5Is a highly toxic substance, is easy to be absorbed by human body after being dissolved in water, and has strong volatility. At present stage for V2O5-WO3/TiO2The research of the catalyst is basically divided into: adding other metal elements such as Cu, Fe, Ce, etc. to the catalyst to reduce V2O5The proportion of (A) reduces toxic pollution; variation of V in the catalyst2O5、WO3To obtain better low temperature activity; the carrier of the catalyst is changed to obtain better specific surface area and dispersion degree.
But from the point of view of commercial application, V2O5-WO3/TiO2The superior performance and low cost of the catalyst make it still in an irreplaceable position, so for V2O5-WO3/TiO2The improvement of the catalyst mainly aims at improving the preparation method of the catalyst, increasing the width of an active temperature window of the catalyst, improving the sulfur resistance and water resistance of the catalyst and the like.
In industrial application, V2O5-WO3/TiO2The final steps of the main preparation method of the catalyst cannot be calcined, the support structure is collapsed due to the increase of the calcination temperature, active components are sintered, and high-temperature calcination is extremely energy loss. Therefore, the improvement of the catalyst preparation conditions and the improvement of the catalytic performance of the catalyst have very important significance in practical application.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a method for preparing V at low temperature2O5-WO3/TiO2Method for preparing catalyst from transition metal oxide V2O5-WO3Is active component, finished TiO2Is used as carrier and has the features of high activity, high selectivity, high sulfur resistance and high water resistance.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of a vanadium-tungsten catalyst is characterized by comprising the following steps: the method comprises the following steps:
(1) dissolving a proper amount of vanadium salt, tungstate and oxalic acid in deionized water, stirring at normal temperature to react completely, then adding a carrier into the obtained mixed solution, and mixing uniformly to obtain a solution A; the carrier is TiO2Or TiO2-SiO2(ii) a The addition amount of the deionized water or the oxalic acid is based on that the vanadium salt or the tungstate can be dissolved completely; the mass ratio of the vanadium salt to the tungstate is 1: 1; the mass ratio of the carrier to the vanadium salt is 100: 1-10;
(2) slowly dropwise adding ammonia water into the obtained solution A, stirring until the pH value is 7-10 to obtain a turbid solution B, and carrying out aftertreatment to obtain a target product vanadium-tungsten catalyst.
Further, in the step (1), the vanadium salt is vanadyl sulfate, vanadyl acetate or vanadyl oxalate.
Further, in the step (1), the tungstate is ammonium tungstate or sodium tungstate.
Further, in the step (2), the stirring reaction time is 5-120 min.
Further, in the step (2), the concentration of the ammonia water is 0.1-1 mol/L.
Still further, in the step (2), the drying time is 8-24 h.
Furthermore, in the step (2), the post-treatment method of the turbid liquid B comprises the following steps: and after the reaction is finished, filtering the obtained turbid liquid B, washing the obtained filter cake with deionized water, collecting precipitate C, and drying at the temperature of between normal temperature and 150 ℃ to obtain the target product vanadium-tungsten catalyst.
Further, the obtained turbid solution B was filtered, and the obtained filter cake was washed 3 times with deionized water.
Further, more specifically, the vanadium-tungsten catalyst prepared by the invention is loaded in a fixed bed reactor, the reaction temperature is controlled to be 0-450 ℃, nitrogen oxide mixed gas is introduced, the flow is controlled to be 100-ion-flow 1000ml/min, and the space velocity is controlled to be 6000-ion-flow 60000h-1The volume fraction of the nitrogen oxide gas mixture is 0.01-0.1% of NO and NH30.01-0.1% by volume of (C), O21-10% by volume of water vaporIntegral percentage of 1-20%, SO2Has an initial final concentration of 50-500ppm, N2As an equilibrium gas, and then separately detecting the NH of the catalyst3-SCR activity, N2The selectivity and the sulfur-resistant and water-resistant performance of the catalyst have more than 90 percent of NO conversion rate and more than 90 percent of N in the temperature window of 200-400 DEG C2And (4) selectivity.
Compared with the prior art, the invention has the beneficial effects that:
the catalyst can be prepared at low temperature without roasting, so that heat is greatly saved, the active components have good dispersity, and the catalyst has good catalytic activity.
Detailed Description
The properties possessed by the present invention will be described in detail below with reference to examples.
Example 1
Firstly, 0.0608g of vanadyl sulfate, 0.0986g of ammonium tungstate and 0.0986g of oxalic acid are dissolved in 30ml of deionized water, stirred at normal temperature for reaction, and then 2.88g of TiO is added2And (3) uniformly stirring the carrier powder to obtain a solution A.
Secondly, slowly dripping 0.5mol/L ammonia water into the solution A prepared in the last step, and continuously stirring until the pH value is 10 to obtain a turbid solution B;
thirdly, filtering the turbid solution B, and repeatedly washing the turbid solution B with a proper amount of deionized water for three times to obtain a precipitate C;
fourthly, drying the precipitate C obtained in the last step at 110 ℃ to obtain a target catalyst, which is marked as A-3;
example 2
Firstly, 0.1823g of vanadyl sulfate, 0.0986g of ammonium tungstate and 0.0986g of oxalic acid are dissolved in 30ml of deionized water, stirred at normal temperature for reaction, and then 2.82g of TiO is added2And (3) uniformly stirring the carrier powder to obtain a solution A.
Secondly, slowly dripping 0.5mol/L ammonia water into the solution A prepared in the last step, and continuously stirring until the pH value is 10 to obtain a turbid solution B;
thirdly, filtering the turbid solution B, and repeatedly washing the turbid solution B with a proper amount of deionized water for three times to obtain a precipitate C;
fourthly, drying the precipitate C obtained in the last step at 110 ℃ to obtain a target catalyst which is marked as B-3;
example 3
Firstly, 0.1823g of vanadyl sulfate, 0.1644g of ammonium tungstate and 0.1644g of oxalic acid are dissolved in 30ml of deionized water, stirred at normal temperature for reaction, and then 2.72g of TiO is added2And (3) uniformly stirring the carrier powder to obtain a solution A.
Secondly, slowly dripping 0.5mol/L ammonia water into the solution A prepared in the last step, and continuously stirring until the pH value is 10 to obtain a turbid solution B;
thirdly, filtering the turbid solution B, and repeatedly washing the turbid solution B with a proper amount of deionized water for three times to obtain a precipitate C;
fourthly, drying the precipitate C obtained in the last step at 110 ℃ to obtain a target catalyst which is marked as B-5;
example 4
Firstly, 0.1823g of vanadyl sulfate, 3288g of ammonium tungstate and 0.3288g of oxalic acid are dissolved in 30ml of deionized water, stirred at normal temperature for reaction, and then 2.61g of TiO is added2And (3) uniformly stirring the carrier powder to obtain a solution A.
Secondly, slowly dripping 0.5mol/L ammonia water into the solution A prepared in the last step, and continuously stirring until the pH value is 10 to obtain a turbid solution B;
thirdly, filtering the turbid solution B, and repeatedly washing the turbid solution B with a proper amount of deionized water for three times to obtain a precipitate C;
fourthly, drying the precipitate C obtained in the last step at 110 ℃ to obtain a target catalyst which is marked as B-10;
example 5
Firstly, 0.3038g of vanadyl sulfate, 0.1644g of ammonium tungstate and 0.1644g of oxalic acid are dissolved in 30ml of deionized water, stirred at normal temperature and reacted, and then 2.70g of TiO is added2And (3) uniformly stirring the carrier powder to obtain a solution A.
Secondly, slowly dripping 0.5mol/L ammonia water into the solution A prepared in the last step, and continuously stirring until the pH value is 10 to obtain a turbid solution B;
thirdly, filtering the turbid solution B, and repeatedly washing the turbid solution B with a proper amount of deionized water for three times to obtain a precipitate C;
fourthly, drying the precipitate C obtained in the last step at 110 ℃ to obtain a target catalyst which is marked as C-5;
example 6
Firstly, 0.3038g of vanadyl sulfate, 0.3288g of ammonium tungstate and 0.3288g of oxalic acid are dissolved in 30ml of deionized water, stirred at normal temperature for reaction, and then added with 2.55g of TiO2And (3) uniformly stirring the carrier powder to obtain a solution A.
Secondly, slowly dripping 0.5mol/L ammonia water into the solution A prepared in the last step, and continuously stirring until the pH value is 10 to obtain a turbid solution B;
thirdly, filtering the turbid solution B, and repeatedly washing the turbid solution B with a proper amount of deionized water for three times to obtain a precipitate C;
fourthly, drying the precipitate C obtained in the last step at 110 ℃ to obtain a target catalyst which is marked as C-10;
catalysts A-3, B-5, B-10, C-5 and C-10 are mixed with NH3As reducing gas, NO and NH3All volume fractions of (1) and (2) are 0.05%, O2Is 5% by volume, N2As balance gas, the flow rate of the mixer is controlled to be 500ml/min, and the space velocity is controlled to be 60000h-1The catalyst loading was 500mg, and the nitrogen oxide conversion and nitrogen selectivity at different temperatures are shown in tables 1 and 2.
TABLE 1 NO conversion for different samples
TABLE 2N of different samples2Selectivity is
Catalysts prepared in examples 1 to 6 were reacted with NH3As reducing gas, NO and NH3All volume fractions of (1) and (2) are 0.05%, O2Volume fraction ofNumber 5%, N2As balance gas, the flow rate of the mixer is controlled to be 500ml/min, and the space velocity is controlled to be 60000h-1The loading amount of the catalyst is 500mg, and the A-3 with the loading amount of the vanadium of 1 percent can realize the NO conversion rate of more than 90 percent and the N of more than 89 percent in the temperature range of 270 ℃ and 410 DEG C2The selectivity can realize more than 90 percent of NO conversion rate and more than 90 percent of N in the temperature range of 210 ℃ and 420 ℃ by B-3, B-5 and B-10 with the increase of the loading amount of vanadium2And (4) selectivity. The addition of V content is beneficial to improving the catalytic activity of the catalyst. The temperature window of C-5 and C-10 with the loading amount of 5 percent is not reduced, but N can be kept in the active temperature window2The selectivity is reduced. The series of catalysts prepared under the drying condition of 110 ℃ all have good NH3-SCR reaction performance.
Claims (5)
1. A preparation method of a vanadium-tungsten catalyst is characterized by comprising the following steps: the method comprises the following steps:
(1) dissolving vanadium salt, tungstate and oxalic acid in deionized water, stirring at normal temperature to react completely, then adding a carrier into the obtained mixed solution, and mixing uniformly to obtain a solution A; the carrier is TiO2Or TiO2-SiO2(ii) a The addition amount of the deionized water or the oxalic acid is based on that the vanadium salt or the tungstate can be dissolved completely; the mass ratio of the vanadium salt to the tungstate is 1: 1; the mass ratio of the carrier to the vanadium salt is 100: 1-10; the vanadium salt is vanadyl sulfate, vanadyl acetate or vanadyl oxalate; the tungstate is ammonium tungstate or sodium tungstate;
(2) slowly dropwise adding ammonia water into the obtained solution A, stirring until the pH value is 7-10 to obtain a turbid solution B, and carrying out aftertreatment to obtain a target product vanadium-tungsten catalyst; the post-treatment method of the turbid liquid B comprises the following steps: and after the reaction is finished, filtering the obtained turbid liquid B, washing the obtained filter cake with deionized water, collecting precipitate C, and drying at the temperature of between normal temperature and 150 ℃ to obtain the target product vanadium-tungsten catalyst.
2. The method of claim 1, wherein: in the step (1), the stirring reaction time is 5-120 min.
3. The method of claim 1, wherein: in the step (2), the concentration of the ammonia water is 0.1-1 mol/L.
4. The method of claim 1, wherein: in the step (2), the drying time is 8-24 h.
5. The method of claim 4, wherein: the obtained turbid solution B was filtered, and the obtained filter cake was washed 3 times with deionized water.
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| CN102921403B (en) * | 2012-09-11 | 2014-06-25 | 河南佰利联化学股份有限公司 | Method for preparing V2O5-WO3/TiO2 powder for making denitration catalyst |
| CN102921405B (en) * | 2012-09-29 | 2014-10-08 | 重庆大学 | A kind of SiO2 added denitrification catalyst and preparation method thereof |
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