CN112007630A - Low-temperature hydrophobic SCR catalyst and preparation method thereof - Google Patents
Low-temperature hydrophobic SCR catalyst and preparation method thereof Download PDFInfo
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- 239000003054 catalyst Substances 0.000 title claims abstract description 53
- 230000002209 hydrophobic effect Effects 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 28
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 17
- 239000010439 graphite Substances 0.000 claims abstract description 17
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 230000008569 process Effects 0.000 claims abstract description 8
- 239000002002 slurry Substances 0.000 claims description 49
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 36
- 238000003756 stirring Methods 0.000 claims description 31
- UNTBPXHCXVWYOI-UHFFFAOYSA-O azanium;oxido(dioxo)vanadium Chemical compound [NH4+].[O-][V](=O)=O UNTBPXHCXVWYOI-UHFFFAOYSA-O 0.000 claims description 16
- 235000006408 oxalic acid Nutrition 0.000 claims description 12
- 239000000843 powder Substances 0.000 claims description 12
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 12
- 238000001694 spray drying Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000006185 dispersion Substances 0.000 claims description 9
- APUPEJJSWDHEBO-UHFFFAOYSA-P ammonium molybdate Chemical compound [NH4+].[NH4+].[O-][Mo]([O-])(=O)=O APUPEJJSWDHEBO-UHFFFAOYSA-P 0.000 claims description 7
- 229940010552 ammonium molybdate Drugs 0.000 claims description 7
- 235000018660 ammonium molybdate Nutrition 0.000 claims description 7
- 239000011609 ammonium molybdate Substances 0.000 claims description 7
- 239000008367 deionised water Substances 0.000 claims description 7
- 229910021641 deionized water Inorganic materials 0.000 claims description 7
- 238000004945 emulsification Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 4
- JKQOBWVOAYFWKG-UHFFFAOYSA-N molybdenum trioxide Inorganic materials O=[Mo](=O)=O JKQOBWVOAYFWKG-UHFFFAOYSA-N 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 5
- 239000003546 flue gas Substances 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000007598 dipping method Methods 0.000 description 4
- 238000001035 drying Methods 0.000 description 3
- 230000001804 emulsifying effect Effects 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000809 air pollutant Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000004056 waste incineration Methods 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
- 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
- B01J23/28—Molybdenum
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- 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
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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
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/18—Carbon
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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
- B01J23/16—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
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Abstract
The invention discloses a preparation method of a low-temperature hydrophobic SCR catalyst, which comprises the following steps: doping expanded graphite to anatase TiO by high shear treatment2In the method, the carrier is taken as a raw material, and an active component V is added2O5And preparing the low-temperature hydrophobic SCR catalyst by using a cocatalyst containing Mo and W elements. The raw materials required by the preparation method are cheap and easy to obtain, the process is simple, the control is easy, and the method has potential application prospects in the field of industrial flue gas denitration. Compared with the similar catalyst, the SCR catalyst prepared by the method has greatly improved low-temperature hydrophobic property.
Description
Technical Field
The invention relates to the technical field of SCR catalyst preparation, in particular to a low-temperature hydrophobic SCR catalyst and a preparation method thereof.
Background
Air pollution prevention and control workerWith the progress of environmental emission standards becoming more stringent, NOx, one of the air pollutants, is one of the key control targets. Selective Catalytic Reduction (SCR) is the mainstream technology for removing NOx by using a fixed source at present, and the technical core of the SCR is an SCR catalyst. V2O5-WO3(MoO3)/TiO2Is the most widely used NH3-an SCR catalyst. Although low-temperature SCR catalysts have been developed in recent years, the catalysts are difficult to apply in industries such as waste incineration and steel sintering, and the denitration flue gas has the characteristics of low temperature, low sulfur, low dust, high moisture content and the like due to the common emission reduction process (SNCR-desulfurization-dedusting-SGH-low-temperature SCR denitration) in the industries, however, the activity of the catalyst is greatly reduced under the conditions of low temperature and high moisture content in the current commercialized catalysts, and the application of the low-temperature SCR catalyst is hindered.
In recent years, many researchers continuously improve the sulfur resistance of the SCR catalyst, but the improvement of the hydrophobic property of high water content under low temperature is not desirable, so that the development of a low temperature hydrophobic SCR catalyst has important significance for the popularization of the low temperature SCR process.
Disclosure of Invention
Objects of the invention
The invention aims to provide a low-temperature hydrophobic SCR catalyst and a preparation method thereof to solve the problem of activity reduction of the catalyst in the prior art under the condition of low-temperature water contact.
(II) technical scheme
In order to solve the above problems, a first aspect of the present invention provides a method for preparing a low-temperature hydrophobic SCR catalyst, comprising: doping expanded graphite to anatase TiO by high shear treatment2In the method, the obtained carrier is used as a raw material to prepare the low-temperature hydrophobic SCR catalyst.
Further, the molecular formula of the low-temperature hydrophobic SCR catalyst is V2O5-X/EG-TiO2Wherein X is Mo and/or W, and EG is expanded graphite.
Further, the mass ratio of each component of the low-temperature hydrophobic SCR catalyst is as follows:
(EG+Ti):V2O5x is 90, (1-5) and (4-9), wherein EG is EG + TiO2The mass percentage of (B) is 5-15%.
Further, the method for doping the expanded graphite into anatase TiO by using high-shear treatment2In (1), obtaining a vector comprises: carrying out emulsification dispersion treatment on deionized water and expanded graphite in a first preset proportion for 1-2 hours to obtain first slurry; adding a second preset proportion of anatase TiO into the first slurry2Continuing to carry out emulsification and dispersion treatment for 1-2 hours to obtain a second slurry; carrying out ultrasonic heating treatment on the second slurry, continuously stirring for 15-30min, and adding oxalic acid in a third preset proportion in the stirring process to obtain a third slurry; adding ammonium metavanadate in a fourth preset proportion into the third slurry at a preset temperature, and continuously stirring for 15-30min to obtain a fourth slurry; adding ammonium molybdate and ammonium tungstate into the fourth slurry according to a fifth preset proportion, and continuously stirring for 15-30min to obtain a fifth slurry; and sequentially carrying out spray drying and roasting treatment on the fifth slurry to obtain low-temperature hydrophobic SCR catalyst powder.
Further, the first preset proportion is, the second preset proportion is, and the third preset proportion is
Further, the fourth preset ratio is a molar ratio of the oxalic acid to the ammonium metavanadate, and the molar ratio is 2: 1-5: 1.
Further, the temperature of the spray drying is 150-300 ℃.
Further, the temperature of the roasting treatment is 400-600 ℃, the retention time in a constant temperature area is 60-180 min, and the temperature rise rate of the tunnel kiln is 5-15 ℃/min.
According to another aspect of the present invention, there is provided a low-temperature hydrophobic SCR catalyst, which is prepared by the method of any one of the above technical schemes.
In order to improve the low-temperature hydrophobic property of the SCR catalyst, the expanded graphite of the hydrophobic material is doped into anatase type TiO by utilizing a high-shear technology2In the preparation of low-temperature SCR catalyst by using the catalyst as a carrier。
(III) advantageous effects
The technical scheme of the invention has the following beneficial technical effects:
the raw materials required by the preparation method are cheap and easy to obtain, the process is simple, and the method has potential application prospects in the field of industrial flue gas denitration.
Drawings
FIG. 1 is a flow chart of a method for preparing a low-temperature hydrophobic SCR catalyst according to a first embodiment of the present invention;
FIG. 2 shows the results of the evaluation of SCR activity of the catalyst samples of examples 1 to 3 at 180 ℃ and 20% water content.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, in a first aspect of an embodiment of the present invention, there is provided a method for preparing a low-temperature hydrophobic SCR catalyst, including:
s1: doping expanded graphite to anatase TiO by high shear treatment2In (1) obtainingA carrier;
s2: and preparing the low-temperature hydrophobic SCR catalyst by using the carrier as a raw material.
The raw materials required by the preparation method of the embodiment are cheap and easy to obtain, the process is simple, and the method has potential application prospects in the field of industrial flue gas denitration.
Optionally, the molecular formula of the low-temperature hydrophobic SCR catalyst is V2O5-X/EG-TiO2Wherein X is Mo and/or W, and EG is expanded graphite.
Optionally, the mass ratio of each component of the low-temperature hydrophobic SCR catalyst is as follows:
(EG+Ti):V2O5x is 90, (1-5) and (4-9), wherein EG is EG + TiO2The mass percentage of (B) is 5-15%.
Optionally, the expanded graphite is doped into anatase TiO by high shear treatment2In (1), obtaining a vector comprises:
s11, carrying out emulsification and dispersion treatment on deionized water and expanded graphite in a first preset proportion for 1-2 hours to obtain first slurry;
s12: adding a second preset proportion of anatase TiO into the first slurry2Continuing to carry out emulsification and dispersion treatment for 1-2 hours to obtain a second slurry;
s13: carrying out ultrasonic heating treatment on the second slurry, continuously stirring for 15-30min, and adding oxalic acid in a third preset proportion in the stirring process to obtain a third slurry;
s14: adding ammonium metavanadate in a fourth preset proportion into the third slurry at a preset temperature, and continuously stirring for 15-30min to obtain a fourth slurry;
s15: adding ammonium molybdate and ammonium tungstate into the fourth slurry according to a fifth preset proportion, and continuously stirring for 15-30min to obtain a fifth slurry;
s16: and carrying out spray drying and roasting treatment on the fifth slurry in sequence to obtain the carrier.
Optionally, the first preset proportion is, the second preset proportion is, and the third preset proportion is
Optionally, the fourth preset ratio is a molar ratio of the oxalic acid to the ammonium metavanadate, and the molar ratio is 2: 1-5: 1.
Optionally, the temperature of the spray drying is 150-300 ℃.
Optionally, the temperature of the roasting treatment is 400-600 ℃, the residence time in the constant temperature region is 60-180 min, and the temperature rise rate of the tunnel kiln is 5-15 ℃/min.
In one embodiment of the invention, a low temperature hydrophobic SCR catalyst is provided for doping Expanded Graphite (EG) into anatase TiO using high shear techniques2Wherein the active component is V by taking the compound as a carrier2O5A composite oxide V formed by adding one or more elements such as Mo and W as a cocatalyst2O5-X/EG-TiO2And X is one or more elements of Mo and W. The mass ratio of each component is (EG + Ti) to V2O5X is 90, (1-5) and (4-9), EG is EG + TiO2The mass percentage of (B) is 5-15%.
The preparation method of the low-temperature hydrophobic SCR catalyst comprises the following steps:
(1) injecting a certain amount of deionized water into a high-speed emulsification dispersion machine, then adding a certain amount of Expanded Graphite (EG), circularly dispersing the slurry for 1-2 h, and then adding anatase TiO2Circularly dispersing for 1-2 h;
(2) transferring the slurry into a dipping reaction kettle with ultrasonic equipment, heating to 40-80 ℃ under the ultrasonic condition, slowly adding quantitative oxalic acid into the slurry under the stirring condition, and continuously stirring for 15-30 min;
(3) adding a certain amount of ammonium metavanadate into the slurry, and continuously stirring for 15-30min to ensure that the ammonium metavanadate is completely dissolved, the slurry is in a bluish color, and the temperature is kept at 40-80 ℃; then, continuously stirring the ammonium molybdate and the ammonium tungstate with a certain amount for 15-30 min;
(4) transferring the powder into spray drying equipment, roasting the prepared powder by using a tunnel kiln, wherein the roasted powder is low-temperature hydrophobic SCR catalyst powder.
Wherein the molar ratio of oxalic acid to ammonium metavanadate is 2: 1-5: 1; the frequency of the ultrasonic wave is 20-50 KHz; (ii) a The roasting temperature is 400-600 ℃, the residence time in the constant temperature area is 60-180 min, and the temperature rise rate of the tunnel kiln is 5-15 ℃/min.
Compared with the similar catalyst, the low-temperature SCR catalyst prepared by the embodiment has the advantages that the low-temperature hydrophobic property is greatly improved, the preparation condition is easy to control, the used raw materials are cheap and easy to obtain, and the industrial production is facilitated.
In another aspect of the embodiments of the present invention, there is provided a low-temperature hydrophobic SCR catalyst, which is prepared by the method of preparing the low-temperature hydrophobic SCR catalyst according to any one of the embodiments.
As shown in fig. 2
Example 1:
adding 1L of deionized water into a high-speed emulsifying disperser, adding 12.1g of EG, circularly dispersing the slurry for 2h, and then adding 230.9g of anatase TiO2And circularly dispersing for 2 hours. Then transferring the slurry into a dipping reaction kettle with ultrasonic equipment, stirring under the conditions that the ultrasonic frequency is 30KHz and the temperature is 60 ℃, then slowly adding 39.8g of oxalic acid into the slurry under the stirring condition, and continuing stirring for 30 min. Then 10.4g of ammonium metavanadate is added into the slurry, and the stirring is continued for 30min, so that the ammonium metavanadate is completely dissolved, the slurry is in a bluish color, and the temperature is kept at 60 ℃. An additional 19.7g of ammonium molybdate was added, after which stirring was continued for 30 min. Drying at 150 ℃ by using spray drying equipment, grinding to 100 meshes by using a Raymond mill, roasting at 500 ℃ for 120min by using a tunnel kiln, and obtaining the roasted powder, namely the low-temperature hydrophobic SCR catalyst powder.
Example 2:
adding 1L of deionized water into a high-speed emulsifying dispersion machine, adding 24.3g of EG, circularly dispersing the slurry for 2 hours, and then adding 218.7g of anatase TiO2And circularly dispersing for 2 hours. Then transferring the slurry into a dipping reaction kettle with ultrasonic equipment, stirring under the conditions that the ultrasonic frequency is 30KHz and the temperature is 60 ℃, then slowly adding 39.8g of oxalic acid into the slurry under the stirring condition, and continuing stirring for 30 min. Then, 10.4g of ammonium metavanadate was added to the above slurryAnd continuously stirring for 30min to ensure that the ammonium metavanadate is completely dissolved, the slurry is in a bluish color, and the temperature is kept at 60 ℃. An additional 19.7g of ammonium molybdate was added, after which stirring was continued for 30 min. Drying at 150 ℃ by using spray drying equipment, grinding to 100 meshes by using a Raymond mill, roasting at 500 ℃ for 120min by using a tunnel kiln, and obtaining the roasted powder, namely the low-temperature hydrophobic SCR catalyst powder.
Example 3:
adding 1L of deionized water into a high-speed emulsifying dispersion machine, adding 36.4g of EG, circularly dispersing the slurry for 2 hours, and then adding 206.6g of anatase TiO2And circularly dispersing for 2 hours. Then transferring the slurry into a dipping reaction kettle with ultrasonic equipment, stirring under the conditions that the ultrasonic frequency is 30KHz and the temperature is 60 ℃, then slowly adding 39.8g of oxalic acid into the slurry under the stirring condition, and continuing stirring for 30 min. Then 10.4g of ammonium metavanadate is added into the slurry, and the stirring is continued for 30min, so that the ammonium metavanadate is completely dissolved, the slurry is in a bluish color, and the temperature is kept at 60 ℃. An additional 19.7g of ammonium molybdate was added, after which stirring was continued for 30 min. Drying at 150 ℃ by using spray drying equipment, grinding to 100 meshes by using a Raymond mill, roasting at 500 ℃ for 120min by using a tunnel kiln, and obtaining the roasted powder, namely the low-temperature hydrophobic SCR catalyst powder.
The invention aims to protect a preparation method of a low-temperature hydrophobic SCR catalyst, which comprises the following steps: doping expanded graphite to anatase TiO by high shear treatment2Obtaining a carrier; and adding Mo and/or W elements into the carrier to obtain the low-temperature hydrophobic SCR catalyst. The raw materials required by the preparation method are cheap and easy to obtain, the process is simple, and the method has potential application prospects in the field of industrial flue gas denitration.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (9)
1. A preparation method of a low-temperature hydrophobic SCR catalyst is characterized by comprising the following steps:
doping expanded graphite to anatase TiO by high shear treatment2Obtaining a carrier;
and preparing the low-temperature hydrophobic SCR catalyst by taking the carrier as a raw material.
2. The method of claim 1, wherein the low-temperature hydrophobic SCR catalyst has a molecular formula of V2O5-X/EG-TiO2Wherein X is MoO3And/or WO3EG is expanded graphite.
3. The preparation method according to claim 2, wherein the mass ratio of the components of the low-temperature hydrophobic SCR catalyst is as follows:
(EG+Ti):V2O5x is 90, (1-5) and (4-9), wherein EG is EG + TiO2The mass percentage of (B) is 5-15%.
4. The method of claim 1, wherein the doping of the expanded graphite to anatase TiO using high shear treatment is performed2In (1), obtaining a vector comprises:
carrying out emulsification dispersion treatment on deionized water and expanded graphite in a first preset proportion for 1-2 hours to obtain first slurry;
adding a second preset proportion of anatase TiO into the first slurry2Continuing to carry out emulsification and dispersion treatment for 1-2 hours to obtain a second slurry;
carrying out ultrasonic heating treatment on the second slurry, continuously stirring for 15-30min, and adding oxalic acid in a third preset proportion in the stirring process to obtain a third slurry;
adding ammonium metavanadate in a fourth preset proportion into the third slurry at a preset temperature, and continuously stirring for 15-30min to obtain a fourth slurry;
adding ammonium molybdate and ammonium tungstate into the fourth slurry according to a fifth preset proportion, and continuously stirring for 15-30min to obtain a fifth slurry;
and sequentially carrying out spray drying and roasting treatment on the fifth slurry to obtain low-temperature hydrophobic SCR catalyst powder.
5. The method according to claim 4, wherein the first predetermined ratio is 20-30% of solid content and the second predetermined ratio is EG: EG + TiO25-15 wt%, the third predetermined ratio being oxalic acid: the molar ratio of the ammonium metavanadate is 4:1-5: 1.
6. The method according to claim 4, wherein the fourth predetermined ratio is a molar ratio of the oxalic acid to the ammonium metavanadate, and the molar ratio is 2:1 to 5: 1.
7. The method according to any one of claims 4 to 7, wherein the temperature of the spray drying is 150 to 300 ℃.
8. The preparation method according to any one of claims 4 to 7, wherein the temperature of the roasting treatment is 400 to 600 ℃, the residence time in a constant temperature region is 60 to 180min, and the temperature rise rate of the tunnel kiln is 5 to 15 ℃/min.
9. A low-temperature hydrophobic SCR catalyst, which is prepared by the preparation method of the low-temperature hydrophobic SCR catalyst according to any one of claims 1 to 8.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112371134A (en) * | 2020-12-04 | 2021-02-19 | 上海交通大学 | Preparation method of expanded graphite-based carrier-loaded low-temperature denitration catalyst |
| CN114588950A (en) * | 2022-03-30 | 2022-06-07 | 北京方信立华科技有限公司 | Preparation method of honeycomb type sulfur-resistant hydrophobic vanadium titanium-based SCR catalyst |
| CN114768795A (en) * | 2022-03-30 | 2022-07-22 | 安徽方信立华环保科技有限公司 | Preparation method of honeycomb catalyst for treating CO in sintering flue gas |
| CN114904517A (en) * | 2022-03-30 | 2022-08-16 | 安徽方信立华环保科技有限公司 | Preparation method of sulfur-resistant hydrophobic CO oxidation catalyst |
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| CN104324714A (en) * | 2014-10-09 | 2015-02-04 | 广西博世科环保科技股份有限公司 | Molybdenum based low temperature SCR denitration catalyst and preparation method thereof |
| CN109012712A (en) * | 2018-09-30 | 2018-12-18 | 北京方信立华科技有限公司 | A kind of low temperature vanadium titanium-based SCR catalyst and preparation method |
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| CN112371134A (en) * | 2020-12-04 | 2021-02-19 | 上海交通大学 | Preparation method of expanded graphite-based carrier-loaded low-temperature denitration catalyst |
| CN112371134B (en) * | 2020-12-04 | 2022-04-08 | 上海交通大学 | Preparation method of expanded graphite-based carrier-loaded low-temperature denitration catalyst |
| CN114588950A (en) * | 2022-03-30 | 2022-06-07 | 北京方信立华科技有限公司 | Preparation method of honeycomb type sulfur-resistant hydrophobic vanadium titanium-based SCR catalyst |
| CN114768795A (en) * | 2022-03-30 | 2022-07-22 | 安徽方信立华环保科技有限公司 | Preparation method of honeycomb catalyst for treating CO in sintering flue gas |
| CN114904517A (en) * | 2022-03-30 | 2022-08-16 | 安徽方信立华环保科技有限公司 | Preparation method of sulfur-resistant hydrophobic CO oxidation catalyst |
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