CN114146733B - Preparation method of wall-flow type carrier catalyst - Google Patents
Preparation method of wall-flow type carrier catalyst Download PDFInfo
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- CN114146733B CN114146733B CN202111149791.0A CN202111149791A CN114146733B CN 114146733 B CN114146733 B CN 114146733B CN 202111149791 A CN202111149791 A CN 202111149791A CN 114146733 B CN114146733 B CN 114146733B
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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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0215—Coating
- B01J37/0228—Coating in several steps
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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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0215—Coating
- B01J37/0221—Coating of particles
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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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0215—Coating
- B01J37/0232—Coating by pulverisation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
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- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Catalysts (AREA)
Abstract
The invention discloses a preparation method of a wall-flow type carrier catalyst, which ensures the uniformity of coating powder on the surface of the wall-flow type carrier through a circulating air system, and simultaneously completes the coating work of a catalyst material on the wall-flow type carrier through repeatedly using coating powder with different powder diameters, thereby improving the firmness of the coating of the wall-flow type carrier surface catalyst, and ensuring the catalytic rate of the coating of the wall-flow type carrier surface catalyst in order to reduce the cost of the coating of the catalyst.
Description
Technical Field
The invention belongs to the technical field of preparation of wall-flow type carrier catalysts, and particularly relates to a preparation method of a wall-flow type carrier catalyst.
Background
With the rapid development of social economy, the holding amount of domestic automobiles is continuously increased, people often neglect the environmental pollution problem caused by automobiles easily while enjoying the convenient life brought by the automobiles, and in order to cope with the pollution problem of harmful substances in automobile exhaust, the national regulations on the automobile exhaust are more stringent. Under this drive, the post-treatment technology of motor vehicles is also continuously developed, for example, the GPF catalyst and the DPF catalyst with different functions are developed aiming at different technical routes of gasoline vehicles and diesel vehicles.
Disclosure of Invention
The invention aims to provide a preparation method of a wall-flow type supported catalyst.
A method for preparing a wall-flow supported catalyst, comprising the steps of:
step one: preparing slurry containing catalyst materials, wherein the solid content of the catalyst materials in the slurry is 10% -20%, and then adding an adhesive and a dispersing agent into the slurry;
step two: placing the slurry in a baking oven to be dried at high temperature for 1-1.5 hours to obtain slurry powder;
step three: dispersing and grinding slurry powder into three batches of coating powder by a grinding instrument, wherein the diameter ranges of the powder in the three batches of coating powder are respectively 0.1 um-1 um, 1 um-2 um and 2 um-5 um, and then pouring the three batches of coating powder into a powder supply machine in batches;
step four: dispersing coating powder with the diameter ranging from 1um to 2um into a circulating air system through a powder supply machine, and indiscriminately coating the coating powder with the diameter ranging from 1um to 2um on the surface of a wall flow type carrier through air flow in the circulating air system, wherein concave holes are formed in the surface of the wall flow type carrier, the porosity of the surface of the wall flow type carrier is 50% -90%, and the aperture range of the concave holes is 10um to 30um;
step five: discharging coating powder with the diameter ranging from 1um to 2um in a circulating air system by using an exhaust filter, dispersing the coating powder with the diameter ranging from 2um to 5um into the circulating air system by using a powder feeder, and coating the coating powder with the diameter ranging from 2um to 5um on the surface of a wall flow type carrier in an indiscriminate manner by using air flow in the circulating air system;
step six: and discharging the coating powder with the diameter ranging from 2um to 5um in the circulating air system by using an exhaust filter, dispersing the coating powder with the diameter ranging from 0.1um to 1um into the circulating air system by using a powder supply machine, and coating the coating powder with the diameter ranging from 0.1um to 1um on the surface of the wall-flow type carrier in an indiscriminate manner by using air flow in the circulating air system to obtain the wall-flow type carrier after coating.
Preferably, the catalyst material in the first step is an oxide or a composite oxide of a supported noble metal.
Preferably, the addition amount of the adhesive in the first step is 1-2% of the weight of the curing amount in the slurry, and the addition amount of the dispersing agent is 0.5-1% of the weight of the curing amount in the slurry.
Preferably, the temperature in the oven in the second step is 100-200 ℃.
Preferably, the water content in the air stream in the circulating air system in the fourth step is not more than 20%.
Preferably, in the fourth step, the surface of the wall-flow carrier has a porosity of 75%, and the pore diameter of the concave holes is 20um.
Preferably, the three coating processes of the wall-flow carrier in the fourth to sixth steps are all accompanied by temperature detection, humidity detection, backpressure detection and PM particulate detection.
The beneficial effects are that: the invention discloses a preparation method of a wall-flow type carrier catalyst, which ensures the uniformity of coating powder on the surface of the wall-flow type carrier through a circulating air system, and simultaneously completes the coating work of a catalyst material on the wall-flow type carrier through repeatedly using coating powder with different powder diameters, thereby improving the firmness of the coating of the wall-flow type carrier surface catalyst, and ensuring the catalytic rate of the coating of the wall-flow type carrier surface catalyst in order to reduce the cost of the coating of the catalyst.
Detailed Description
The present invention will be described in further detail with reference to the following examples, which are only for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
A method for preparing a wall-flow supported catalyst, comprising the steps of:
step one: preparing slurry containing catalyst materials, wherein the solid content of the catalyst materials in the slurry is 10% -20%, and then adding an adhesive and a dispersing agent into the slurry;
step two: placing the slurry in a baking oven to be dried at high temperature for 1-1.5 hours to obtain slurry powder;
step three: dispersing and grinding slurry powder into three batches of coating powder by a grinding instrument, wherein the diameter ranges of the powder in the three batches of coating powder are respectively 0.1 um-1 um, 1 um-2 um and 2 um-5 um, and then pouring the three batches of coating powder into a powder supply machine in batches;
step four: dispersing coating powder with the diameter ranging from 1um to 2um into a circulating air system through a powder supply machine, and indiscriminately coating the coating powder with the diameter ranging from 1um to 2um on the surface of a wall flow type carrier through air flow in the circulating air system, wherein concave holes are formed in the surface of the wall flow type carrier, the porosity of the surface of the wall flow type carrier is 50% -90%, and the aperture range of the concave holes is 10um to 30um;
step five: discharging coating powder with the diameter ranging from 1um to 2um in a circulating air system by using an exhaust filter, dispersing the coating powder with the diameter ranging from 2um to 5um into the circulating air system by using a powder feeder, and coating the coating powder with the diameter ranging from 2um to 5um on the surface of a wall flow type carrier in an indiscriminate manner by using air flow in the circulating air system;
step six: and discharging the coating powder with the diameter ranging from 2um to 5um in the circulating air system by using an exhaust filter, dispersing the coating powder with the diameter ranging from 0.1um to 1um into the circulating air system by using a powder supply machine, and coating the coating powder with the diameter ranging from 0.1um to 1um on the surface of the wall-flow type carrier in an indiscriminate manner by using air flow in the circulating air system to obtain the wall-flow type carrier after coating.
In this embodiment, the catalyst material in the first step is an oxide or a composite oxide carrying a noble metal.
In this embodiment, the amount of the adhesive added in the first step is 1% -2% of the weight of the curing amount in the slurry, and the amount of the dispersant added is 0.5% -1% of the weight of the curing amount in the slurry.
In this embodiment, the temperature in the oven in the second step is 100 ℃ to 200 ℃.
In this embodiment, the water content in the air flow in the circulating air system in the fourth step is not greater than 20%.
In this embodiment, in the fourth step, the surface of the wall-flow carrier has a porosity of 75%, and the hole diameter of the concave hole is 20um.
In this embodiment, the three coating processes of the wall-flow carrier in the fourth to sixth steps are all accompanied by temperature detection, humidity detection, backpressure detection and PM particulate detection.
The first time of selecting the coating powder with medium powder diameter is to indirectly increase the contact area between the coating powder with larger diameter and the wall-flow type carrier, improve the coating firmness of the catalyst coating on the surface of the wall-flow type carrier, the second time of selecting the coating powder with larger powder diameter is to reduce the cost of the catalyst coating, and the third time of selecting the coating powder with smaller powder diameter is to ensure the catalytic rate of the catalyst coating on the surface of the wall-flow type carrier.
The invention discloses a preparation method of a wall-flow type carrier catalyst, which ensures the uniformity of coating powder on the surface of the wall-flow type carrier through a circulating air system, and simultaneously completes the coating work of a catalyst material on the wall-flow type carrier through repeatedly using coating powder with different powder diameters, thereby improving the firmness of the coating of the wall-flow type carrier surface catalyst, and ensuring the catalytic rate of the coating of the wall-flow type carrier surface catalyst in order to reduce the cost of the coating of the catalyst.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (7)
1. The preparation method of the wall-flow type supported catalyst is characterized by comprising the following steps of:
step one: preparing slurry containing catalyst materials, wherein the solid content of the catalyst materials in the slurry is 10% -20%, and then adding an adhesive and a dispersing agent into the slurry;
step two: placing the slurry in a baking oven to be dried at high temperature for 1-1.5 hours to obtain slurry powder;
step three: dispersing and grinding slurry powder into three batches of coating powder by a grinding instrument, wherein the diameter ranges of the powder in the three batches of coating powder are respectively 0.1 um-1 um, 1 um-2 um and 2 um-5 um, and then pouring the three batches of coating powder into a powder supply machine in batches;
step four: dispersing coating powder with the diameter ranging from 1um to 2um into a circulating air system through a powder supply machine, and indiscriminately coating the coating powder with the diameter ranging from 1um to 2um on the surface of a wall flow type carrier through air flow in the circulating air system, wherein concave holes are formed in the surface of the wall flow type carrier, the porosity of the surface of the wall flow type carrier is 50% -90%, and the aperture range of the concave holes is 10um to 30um;
step five: discharging coating powder with the diameter ranging from 1um to 2um in a circulating air system by using an exhaust filter, dispersing the coating powder with the diameter ranging from 2um to 5um into the circulating air system by using a powder feeder, and coating the coating powder with the diameter ranging from 2um to 5um on the surface of a wall flow type carrier in an indiscriminate manner by using air flow in the circulating air system;
step six: and discharging the coating powder with the diameter ranging from 2um to 5um in the circulating air system by using an exhaust filter, dispersing the coating powder with the diameter ranging from 0.1um to 1um into the circulating air system by using a powder supply machine, and coating the coating powder with the diameter ranging from 0.1um to 1um on the surface of the wall-flow type carrier in an indiscriminate manner by using air flow in the circulating air system to obtain the wall-flow type carrier after coating.
2. The method for preparing a wall-flow supported catalyst according to claim 1, wherein the catalyst material in the first step is an oxide or a composite oxide of a supported noble metal.
3. The method for preparing a wall-flow supported catalyst according to claim 1, wherein the binder in the first step is added in an amount of 1 to 2% by weight of the curing amount in the slurry, and the dispersant is added in an amount of 0.5 to 1% by weight of the curing amount in the slurry.
4. The method for preparing a wall-flow supported catalyst according to claim 1, wherein the temperature in the oven in the second step is 100 ℃ to 200 ℃.
5. The method of claim 1, wherein the water content in the air stream in the circulating air system in the fourth step is not more than 20%.
6. The method for preparing a wall-flow supported catalyst according to claim 1, wherein the surface of the wall-flow supported catalyst in the fourth step has a porosity of 75%, and the pore diameter of the concave holes is 20 μm.
7. The method for preparing a wall-flow supported catalyst according to claim 1, wherein the three coating processes of the wall-flow supported catalyst in the fourth to sixth steps are accompanied by temperature detection, humidity detection, back pressure detection and PM particulate matter detection.
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| CN202111149791.0A CN114146733B (en) | 2021-09-29 | 2021-09-29 | Preparation method of wall-flow type carrier catalyst |
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| CN202111149791.0A CN114146733B (en) | 2021-09-29 | 2021-09-29 | Preparation method of wall-flow type carrier catalyst |
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| CN114146733B true CN114146733B (en) | 2023-06-30 |
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| US20220258150A1 (en) * | 2021-02-12 | 2022-08-18 | Johnson Matthey Public Limited Company | Particulate filters |
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