CN114433078A - Coating slurry for noble metal monolithic catalyst - Google Patents
Coating slurry for noble metal monolithic catalyst Download PDFInfo
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- CN114433078A CN114433078A CN202210092643.8A CN202210092643A CN114433078A CN 114433078 A CN114433078 A CN 114433078A CN 202210092643 A CN202210092643 A CN 202210092643A CN 114433078 A CN114433078 A CN 114433078A
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- 239000003054 catalyst Substances 0.000 title claims abstract description 110
- 229910000510 noble metal Inorganic materials 0.000 title claims abstract description 82
- 239000006255 coating slurry Substances 0.000 title claims abstract description 53
- 238000000498 ball milling Methods 0.000 claims abstract description 62
- 239000000843 powder Substances 0.000 claims abstract description 53
- 239000011230 binding agent Substances 0.000 claims abstract description 33
- VXAUWWUXCIMFIM-UHFFFAOYSA-M aluminum;oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Al+3] VXAUWWUXCIMFIM-UHFFFAOYSA-M 0.000 claims abstract description 24
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000012153 distilled water Substances 0.000 claims abstract description 23
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 22
- 229910052878 cordierite Inorganic materials 0.000 claims abstract description 22
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 7
- 239000000969 carrier Substances 0.000 claims abstract description 6
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052863 mullite Inorganic materials 0.000 claims abstract description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 18
- 238000002360 preparation method Methods 0.000 claims description 14
- 229910052703 rhodium Inorganic materials 0.000 claims description 10
- 239000010948 rhodium Substances 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 9
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 8
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 6
- 229910052697 platinum Inorganic materials 0.000 claims description 5
- 229910052763 palladium Inorganic materials 0.000 claims description 4
- 238000000151 deposition Methods 0.000 claims description 3
- 238000005470 impregnation Methods 0.000 claims description 3
- 238000000366 colloid method Methods 0.000 claims description 2
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 claims description 2
- 238000000576 coating method Methods 0.000 abstract description 41
- 239000011248 coating agent Substances 0.000 abstract description 40
- 239000002002 slurry Substances 0.000 abstract description 19
- 230000007547 defect Effects 0.000 abstract description 5
- 238000007581 slurry coating method Methods 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- 239000002131 composite material Substances 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000002195 synergetic effect Effects 0.000 abstract description 3
- 239000002253 acid Substances 0.000 abstract description 2
- 238000012986 modification Methods 0.000 abstract description 2
- 230000004048 modification Effects 0.000 abstract description 2
- 239000010970 precious metal Substances 0.000 description 10
- 238000001035 drying Methods 0.000 description 9
- 238000005303 weighing Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 230000009977 dual effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 229910000420 cerium oxide Inorganic materials 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000008570 general process Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000009210 therapy by ultrasound Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- 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
- B01J31/26—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24
-
- 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
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
- B01J23/42—Platinum
-
- 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
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
- B01J23/44—Palladium
-
- 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
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
- B01J23/46—Ruthenium, rhodium, osmium or iridium
- B01J23/464—Rhodium
Abstract
The invention discloses a coating slurry for a noble metal monolithic catalyst, which is obtained by adding a noble metal powder catalyst and a binder into a ball milling tank, adding distilled water, adjusting the pH value to 2-4 by nitric acid after ball milling in a ball mill, and ball milling again. The coating slurry overcomes the defect that the coating is easy to fall off in the conventional slurry coating process through the synergistic effect of the pseudo-boehmite and the polyethylene glycol double-binder, and the falling rate of the prepared noble metal monolithic catalyst is less than 0.1 percent; the property of the noble metal coating slurry is improved through acid modification, so that the coating slurry is not only suitable for a single noble metal and a composite noble metal powder catalyst, but also suitable for coating various carriers such as cordierite, mullite and the like. Meanwhile, compared with the conventional slurry, the single carrier coating load rate of the slurry can reach over 9.0 percent, the coating times for achieving the target load rate are reduced, the production cost is reduced, and the economic benefit is improved.
Description
Technical Field
The invention belongs to the technical field of catalysis, and particularly relates to coating slurry for a noble metal monolithic catalyst.
Background
The noble metal monolithic catalyst is prepared by taking honeycomb cordierite or mullite and the like as carriers, taking alumina or cerium oxide as coatings and taking noble metal as an active component, and is widely applied to environmental management because of lower bed pressure and good mass transfer efficiency.
In recent years, various methods for preparing noble metal monolithic catalysts have been reported, but the slurry coating method is mainly used as a preparation method commonly used in industrial production. The general process of the slurry coating method is to disperse the coating material to make slurry, immerse the whole carrier in the coating slurry, remove the redundant residual liquid by methods such as air blowing, and finally dry and bake at a certain temperature. The method has the advantages that the diffusion distance between the carrier channel and the slurry is short, the operation is simple, the preparation is easy, the property of the slurry is the factor which has the greatest influence on the coating effect, and therefore, the coating of the slurry is the key point for the preparation of the noble metal monolithic catalyst.
The research on noble metal monolithic catalyst coating slurry is more in the market at present, but as the specific formula relates to technical secrets, few related coating slurry formulas are published. The coating slurry formula mainly comprises a coating material, a binder, a solvent and the like, the conventional slurry formula has the defect of easy falling off although the coating is simple, in addition, the loading capacity of single coating is also a large investigation factor of the formula, and how to load more catalysts in fewer coating times is a large key faced by the formula. Therefore, in order to solve the above problems, the development of excellent catalyst coating slurry formulations based on different carriers and active components is the key point of breakthrough in monolithic catalyst coating technology.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the coating slurry for the noble metal monolithic catalyst, the coating slurry is not only suitable for a single noble metal and a composite noble metal powder catalyst, but also suitable for coating various carriers such as cordierite, mullite and the like, the defect that a coating is easy to fall off after the conventional slurry is coated is overcome, the coating load rate of a single carrier is high, the coating times for achieving the target load rate are reduced, and the production cost is reduced.
In order to achieve the purpose, the precious metal monolithic catalyst coating slurry adopted by the invention comprises a precious metal powder catalyst, a binder, nitric acid and distilled water, wherein the precious metal powder catalyst and the binder are added into a ball milling tank, the distilled water is added into the ball milling tank, the ball milling tank is placed into a ball mill for ball milling, the pH value is adjusted to be 2-4 through the nitric acid after the ball milling, and the precious metal monolithic catalyst coating slurry is obtained through ball milling again; the binder is pseudo-boehmite and polyethylene glycol, the addition amount of the pseudo-boehmite is 2-5% of the mass of the noble metal powder catalyst, and the addition amount of the polyethylene glycol is 0.1-0.5% of the mass of the noble metal powder catalyst.
The active component of the noble metal powder catalyst is any one or more noble metals of palladium, platinum and rhodium, the carrier is nano alumina powder, and the preparation method is any one of an impregnation method, a colloid method and a deposition method.
In the coating slurry for the noble metal monolithic catalyst, the adding amount of the distilled water is preferably controlled to be 18-20% of the solid content, wherein the solid content refers to the ratio of the mass sum of the catalyst and the binder to the mass sum of the catalyst, the binder and the distilled water.
In the noble metal monolithic catalyst coating slurry, it is further preferable that the ball milling time is 20 to 40 minutes before the pH is adjusted by the nitric acid, and the ball milling time is 50 to 70 minutes after the pH is adjusted by the nitric acid.
Suitable supports for the above-described slurry for noble metal monolith catalyst coating include cordierite and mullite.
Compared with the prior art, the invention has the following beneficial effects:
1. the coating slurry overcomes the defect that the coating is easy to fall off in the conventional slurry coating through the synergistic effect of the pseudo-boehmite and the polyethylene glycol double-binder, and the falling rate of the prepared monolithic catalyst is less than 0.1 percent through ultrasonic 1h experiment verification.
2. The invention improves the property of the noble metal coating slurry by two means of acid modification and adhesive addition, so that the coating slurry is not only suitable for a single noble metal and a composite noble metal powder catalyst, but also suitable for coating various carriers such as cordierite, mullite and the like.
3. Compared with the conventional slurry, the noble metal monolithic catalyst coating slurry has higher single carrier coating load rate, the single load rate of the noble metal monolithic catalyst coating slurry can reach more than 9.0 percent, the coating times for achieving the target load rate are reduced, the production cost is reduced, and the economic benefit is improved.
Detailed Description
The present invention will be described in further detail with reference to examples, but the scope of the present invention is not limited to these examples.
The noble metal powder catalysts in the following examples 1 to 3 are all prepared by an impregnation method, and the noble metal powder catalysts in the examples 4 to 5 and the comparative examples 1 to 3 are all prepared by a deposition method, wherein alumina is used as a carrier, noble metal is used as an active component, and the percentage content of the noble metal before the noble metal refers to the loading amount of the noble metal in the catalyst, based on 100% of the mass of the catalyst.
Example 1
The noble metal monolithic catalyst coating slurry comprises a noble metal powder catalyst, a binder, nitric acid and distilled water, wherein the noble metal powder catalyst is a 1% Pd/alumina powder catalyst, the binder is pseudo-boehmite accounting for 5% of the mass of the noble metal powder catalyst and 0.5% of polyethylene glycol, and the solid content is 20%.
The preparation method of the noble metal monolithic catalyst coating slurry comprises the following steps: weighing 3g of 1% Pd/alumina powder catalyst, 0.15g of pseudo-boehmite and 0.015g of polyethylene glycol in a ball milling tank, adding 12.66g of distilled water, placing the ball milling tank in a ball mill for ball milling for 0.5h, adjusting the pH to 4 by nitric acid after ball milling, ball milling for 1h again to obtain noble metal monolithic catalyst coating slurry, coating the slurry on weighed cordierite, and drying at 60 ℃.
Example 2
The noble metal monolithic catalyst coating slurry comprises a noble metal powder catalyst, a binder, nitric acid and distilled water, wherein the noble metal powder catalyst is a 1% Pt/alumina powder catalyst, the binder is pseudo-boehmite accounting for 4% of the mass of the noble metal powder catalyst and 0.4% of polyethylene glycol, and the solid content is 19%.
The preparation method of the noble metal monolithic catalyst coating slurry comprises the following steps: weighing 3g of 1% Pt/alumina powder catalyst, 0.12g of pseudo-boehmite and 0.012g of polyethylene glycol in a ball milling tank, adding 13.35g of distilled water, placing the ball milling tank in a ball mill for ball milling for 0.5h, adjusting the pH value to 3.5 by nitric acid after ball milling, ball milling for 1h again to obtain noble metal monolithic catalyst coating slurry, coating the slurry on the weighed cordierite, and drying at 60 ℃.
Example 3
The precious metal monolithic catalyst coating slurry comprises a precious metal powder catalyst, a binder, nitric acid and distilled water, wherein the precious metal powder catalyst is a 1% Rh/alumina powder catalyst, the binder is pseudoboehmite accounting for 3% of the mass of the precious metal powder catalyst and 0.4% of polyethylene glycol, and the solid content is 19%.
The preparation method of the noble metal monolithic catalyst coating slurry comprises the following steps: weighing 3g of 1% Rh/alumina powder catalyst, 0.09g of pseudo-boehmite and 0.012g of polyethylene glycol in a ball milling tank, adding 13.22g of distilled water, placing the ball milling tank in a ball mill for ball milling for 0.5h, adjusting the pH to 3 by nitric acid after ball milling, ball milling for 1h again to obtain noble metal monolithic catalyst coating slurry, coating the slurry on the weighed cordierite, and drying at 60 ℃.
Example 4
The noble metal monolithic catalyst coating slurry comprises a noble metal powder catalyst, a binder, nitric acid and distilled water, wherein the noble metal powder catalyst is 1.2% of Pd-0.8% of Pt/alumina powder catalyst, the binder is pseudo-boehmite accounting for 2% of the mass of the noble metal powder catalyst and 0.2% of polyethylene glycol, and the solid content is 18%.
The preparation method of the noble metal monolithic catalyst coating slurry comprises the following steps: weighing 3g of 1.2% Pd-0.8% Pt/alumina powder catalyst, 0.06g of pseudo-boehmite and 0.006g of polyethylene glycol in a ball milling tank, adding 13.97g of distilled water, placing the ball milling tank in a ball mill for ball milling for 0.5h, adjusting the pH to 2 by nitric acid after ball milling, performing ball milling for 1h again to obtain noble metal monolithic catalyst coating slurry, coating the slurry on weighed cordierite, and drying at 60 ℃.
Example 5
The noble metal monolithic catalyst coating slurry comprises a noble metal powder catalyst, a binder, nitric acid and distilled water, wherein the noble metal powder catalyst is a 1.8% Pd-1.2% Pt-0.6% Rh/alumina powder catalyst, the binder is pseudo-boehmite accounting for 2% of the mass of the noble metal powder catalyst and 0.1% polyethylene glycol, and the solid content is 18%.
The preparation method of the noble metal monolithic catalyst coating slurry comprises the following steps: weighing 3g of 1.8% Pd-1.2% Pt-0.6% Rh/alumina powder catalyst, 0.06g of pseudo-boehmite and 0.003g of polyethylene glycol in a ball milling tank, adding 13.95g of distilled water, placing the ball milling tank in a ball mill for ball milling for 0.5h, adjusting the pH to 2 by nitric acid after ball milling, performing ball milling for 1h again to obtain noble metal monolithic catalyst coating slurry, coating the slurry on the weighed cordierite, and drying at 60 ℃.
Comparative example 1
In example 5, the binder is only pseudo-boehmite 2% relative to the powder catalyst, no polyethylene glycol is added, other components and contents are the same as those in example 5, and the preparation method of the noble metal monolithic catalyst coating slurry comprises the following steps: weighing 3g of 1.8% Pd-1.2% Pt-0.6% Rh/alumina powder catalyst and 0.06g of pseudo-boehmite in a ball milling tank, adding 13.94g of distilled water, placing the ball milling tank in a ball mill for ball milling for 0.5h, adjusting the pH to 2 by nitric acid after ball milling, ball milling for 1h again to obtain noble metal monolithic catalyst coating slurry, coating the slurry on weighed cordierite, and drying at 60 ℃.
Comparative example 2
In example 5, the binder is only polyethylene glycol 0.1% of the powder catalyst, no pseudo-boehmite is added, other components and contents are the same as those in example 5, and the preparation method of the noble metal monolithic catalyst coating slurry comprises the following steps: weighing 3g of 1.8% Pd-1.2% Pt-0.6% Rh/alumina powder catalyst and 0.003g of polyethylene glycol in a ball milling tank, adding 13.68g of distilled water, placing the ball milling tank in a ball mill for ball milling for 0.5h, adjusting the pH to 2 by nitric acid after ball milling, ball milling for 1h again to obtain noble metal monolithic catalyst coating slurry, coating the slurry on weighed cordierite, and drying at 60 ℃.
Comparative example 3
In example 5, the binder is pseudo-boehmite 2.1% of the powder catalyst, no polyethylene glycol is added, other components and contents are the same as those in example 5, and the preparation method of the noble metal monolithic catalyst coating slurry comprises the following steps: weighing 3g of 1.8% Pd-1.2% Pt-0.6% Rh/alumina powder catalyst and 0.063g of pseudo-boehmite in a ball milling tank, adding 13.95g of distilled water, placing the ball milling tank in a ball mill for ball milling for 0.5h, adjusting the pH to 2 by nitric acid after ball milling, ball milling for 1h again to obtain noble metal monolithic catalyst coating slurry, coating the slurry on weighed cordierite, and drying at 60 ℃.
Comparative example 4
In example 5, the binder is pseudo-boehmite 2.1% of the powder catalyst, no polyethylene glycol is added, other components and contents are the same as those in example 5, and the preparation method of the noble metal monolithic catalyst coating slurry comprises the following steps: weighing 3g of 1.8% Pd-1.2% Pt-0.6% Rh/alumina powder catalyst and 0.063g of pseudo-boehmite in a ball milling tank, adding 13.95g of distilled water, placing the ball milling tank in a ball mill for ball milling for 0.5h, adjusting the pH to 2 by nitric acid after ball milling, ball milling for 1h again to obtain noble metal monolithic catalyst coating slurry, coating the slurry on weighed cordierite, and drying at 60 ℃.
The monolithic cordierite catalysts coated in examples 1 to 5 and comparative examples 1 to 4 were weighed, and the value obtained by subtracting the mass a of the original cordierite was defined as coating amount B, all the coated monolithic cordierite catalysts were subjected to ultrasonic treatment for 1 hour, and all the monolithic cordierite catalysts were weighed again, and the value obtained by subtracting the mass a of the original cordierite was defined as coating amount C, (coating amount B-coating amount C)/coating amount B as a peeling rate, and coating amount C/mass a of cordierite as a loading rate. The test results are shown in table 1.
Table 1 coating slip test results
It can be seen from table 1 that the monolithic cordierite catalysts coated with the dual binders in examples 1-5, regardless of whether the single precious metal or the composite precious metal is used as the active component, have a shedding rate of less than 0.1% and a single loading rate of more than 9.0%, and compared with the shedding rate of 4.50%, the loading rate of 7.210%, the shedding rate of 4.63%, and the loading rate of 7.560% obtained by adding only the single binder pseudo-boehmite in comparative examples 1 and 3, and the shedding rate of 1.90%, the loading rate of 4.800%, the shedding rate of 2.51%, and the loading rate of 5.839% obtained by adding only the single binder polyethylene glycol in comparative examples 2 and 4, the slurry coating after adding the single binder in the invention overcomes the disadvantage that the coating is easy to shed due to the synergistic effect of the dual binders, and simultaneously has a significantly high single carrier coating loading rate, reduces the coating times for achieving the target loading rate, and reduces the production cost, the economic benefit is improved.
Claims (5)
1. A coating slurry for a noble metal monolithic catalyst, characterized in that: the coating slurry comprises a noble metal powder catalyst, a binder, nitric acid and distilled water, and is obtained by adding the noble metal powder catalyst and the binder into a ball milling tank, adding the distilled water, placing the ball milling tank into a ball mill for ball milling, adjusting the pH value to 2-4 by the nitric acid after ball milling, and performing ball milling again;
the binder is pseudo-boehmite and polyethylene glycol, the addition amount of the pseudo-boehmite is 2-5% of the mass of the noble metal powder catalyst, and the addition amount of the polyethylene glycol is 0.1-0.5% of the mass of the noble metal powder catalyst.
2. The coating slurry for a noble metal monolithic catalyst according to claim 1, wherein: the active component of the noble metal powder catalyst is any one or more noble metals of palladium, platinum and rhodium, the carrier of the noble metal powder catalyst is nano alumina powder, and the preparation method of the noble metal powder catalyst is any one of an impregnation method, a colloid method and a deposition method.
3. The coating slurry for a noble metal monolithic catalyst according to claim 1, wherein: the adding amount of the distilled water is controlled to be 18-20% of solid content, and the solid content refers to the ratio of the mass sum of the catalyst and the binder to the mass sum of the catalyst, the binder and the distilled water.
4. The coating slurry for a noble metal monolithic catalyst according to claim 1, wherein: the ball milling time is 20-40 minutes before the pH is adjusted by nitric acid, and is 50-70 minutes after the pH is adjusted by nitric acid.
5. The coating slurry for a noble metal monolithic catalyst according to claim 1, wherein: suitable carriers for the coating slurry include cordierite and mullite.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101209425A (en) * | 2006-12-30 | 2008-07-02 | 比亚迪股份有限公司 | Method for preparing slurry containing aluminum oxide |
| CN101653724A (en) * | 2009-09-10 | 2010-02-24 | 上海纳米技术及应用国家工程研究中心有限公司 | Ceramics catalyst surface active coating and its preparation method |
| CN102580734A (en) * | 2012-02-22 | 2012-07-18 | 华东理工大学 | Monolithic catalyst for high-water-content acrylic acid waste gas purification and preparation method of monolithic catalyst |
| US20170216820A1 (en) * | 2014-07-22 | 2017-08-03 | Sinocat Environmental Technology Co., Ltd. | Method for Preparing Noble Metal Catalyst |
| CN113731421A (en) * | 2021-09-29 | 2021-12-03 | 北京工业大学 | Coating process of CO monolithic catalyst and preparation method thereof |
-
2022
- 2022-01-26 CN CN202210092643.8A patent/CN114433078A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101209425A (en) * | 2006-12-30 | 2008-07-02 | 比亚迪股份有限公司 | Method for preparing slurry containing aluminum oxide |
| CN101653724A (en) * | 2009-09-10 | 2010-02-24 | 上海纳米技术及应用国家工程研究中心有限公司 | Ceramics catalyst surface active coating and its preparation method |
| CN102580734A (en) * | 2012-02-22 | 2012-07-18 | 华东理工大学 | Monolithic catalyst for high-water-content acrylic acid waste gas purification and preparation method of monolithic catalyst |
| US20170216820A1 (en) * | 2014-07-22 | 2017-08-03 | Sinocat Environmental Technology Co., Ltd. | Method for Preparing Noble Metal Catalyst |
| CN113731421A (en) * | 2021-09-29 | 2021-12-03 | 北京工业大学 | Coating process of CO monolithic catalyst and preparation method thereof |
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