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Preparation method of lean-burn type natural gas vehicle catalyst

A natural gas and catalyst technology, applied in the field of catalysis, can solve problems such as unsatisfactory NOx treatment effect, and achieve the effects of low cost, good anti-aging performance and simple preparation process

Active Publication Date: 2013-07-10
WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Coatings 1 and 2 were respectively made into powder, ground with water, coated on the catalyst carrier, dried, and calcined (prepared separately). HC shows good activity, but not ideal for NOx treatment after aging and lean burn

Method used

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  • Preparation method of lean-burn type natural gas vehicle catalyst
  • Preparation method of lean-burn type natural gas vehicle catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The preparation method of lean-burn type natural gas vehicle catalyst, the steps are as follows in parts by weight:

[0046] (1) Slurry preparation: Take 5 parts of alumina, 1 part of lanthanum nitrate, 1 part of barium nitrate, 1.5 parts of cerium nitrate, and 4.5 parts of cerium-zirconium materials, add them to 13 parts of water, stir for 2 hours until they are evenly mixed; ball mill the slurry, Make the slurry particle size 5-30 μm, adjust the pH to 2-7 with 0.05mol / L dilute nitric acid, and adjust the slurry viscosity to 500cpi;

[0047] (2) Drying of sizing: use a pumping type coating machine, adjust the pumping pressure to 0.1MPa, take the cordierite honeycomb ceramic carrier and dip it in the slurry prepared in step (1), extract the excess slurry; put the cordierite after sizing After the honeycomb ceramic carrier was dried for 6 hours, it was baked at 450°C for 4 hours;

[0048] (3) Impregnating precious metal solution: Take 8 parts of palladium nitrate and 2 ...

Embodiment 2

[0053] The preparation method of lean-burn type natural gas vehicle catalyst, the steps are as follows in parts by weight:

[0054] (1) Slurry preparation: Take 5 parts of alumina, 1 part of lanthanum nitrate, 1 part of barium nitrate, 1.5 parts of cerium nitrate, 4.5 parts of cerium-zirconium material, 10 parts of palladium nitrate, and 1 part of chloroplatinic acid, and add them to 13 parts of water , stir for 2 hours until it is evenly mixed; ball mill the slurry to make the slurry particle size 5-30 μm, adjust the pH to 7 with 0.05mol / L dilute nitric acid, and adjust the slurry viscosity to 500-cpi;

[0055] (2) Drying of sizing: use a pumping type coating machine, adjust the pumping pressure to 0.1MPa, take the cordierite honeycomb ceramic carrier and dip it in the slurry prepared in step (1), extract the excess slurry; put the cordierite after sizing After the honeycomb ceramic carrier was dried at 100°C for 6 hours, it was baked at 450°C for 4 hours to obtain the lean-b...

Embodiment 3

[0059] The preparation method of lean-burn type natural gas vehicle catalyst, the steps are as follows in parts by weight:

[0060] (1) Slurry preparation: Take 5 parts of alumina, 1 part of lanthanum nitrate, 1 part of barium nitrate, 1.5 parts of cerium nitrate, 4.5 parts of cerium-zirconium material, and 10 parts of palladium nitrate, add them to 13 parts of water, stir for 2 hours until they are mixed Uniform; ball mill the slurry to make the slurry particle size 5-30μm, adjust the pH to 4 with 0.1mol / L dilute nitric acid, and adjust the slurry viscosity to 1000cpi;

[0061] (2) Sizing and drying: Use an air-extraction coating machine, adjust the air-extraction pressure to 0.3MPa, take the cordierite honeycomb ceramic carrier and immerse it in the slurry prepared in step (1), extract the excess slurry; put the cordierite after sizing After the honeycomb ceramic carrier is dried for 4 hours, it is baked at 500°C for 3 hours;

[0062] (3) Secondary sizing: take 2 parts of c...

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Abstract

The invention relates to a preparation method of a lean-burn type natural gas vehicle catalyst. The catalyst has low ignition temperature and high catalyzed oxidation efficiency to methane and belongs to the technical field of catalysis. According to the preparation method, cordierite honeycomb ceramic is used as a carrier, activated aluminium oxide and various salt additives are used as coatings, precious metals of Pt and Pd are used as catalyst activity components, and the catalyst for efficient catalytic oxidation of the methane is prepared by changing a coating formula and a coating process. The preparation method comprises the following steps of: taking and dissolving various salt additives to deionized water, adding the activated aluminium oxide with a certain proportion, stirring and ball-milling, controlling seriflux parameters to prepare coating size, adding precious metal salt to the size in batches according to different loading method of Pt and Pd metals, dipping the cordierite honeycomb ceramic carrier to the size after uniformly stirring, and roasting at a high temperature after drying to obtain the catalyst. Compared with conventional catalyst, the catalyst prepared by the invention has the advantages of simple preparation process, low ignition temperature of the methane, high conversion rate of the methane, low cost, good ageing resistance, and the like.

Description

technical field [0001] The invention relates to a preparation method of a catalyst for a high-performance lean-burn type natural gas vehicle. The catalyst has a lower light-off temperature and a higher catalytic oxidation efficiency for methane, and belongs to the technical field of catalysis. Background technique [0002] With the development of society, the number of automobiles increases rapidly, the total amount of automobile exhaust emissions continues to increase, the proportion of automobile exhaust pollution to air pollution sources continues to increase, and the degree of environmental damage continues to increase. In addition, vehicle exhaust emissions Regulations are becoming more and more stringent, and oil resources are becoming increasingly depleted. Ordinary gasoline engines and diesel engines need to invest a lot of money to meet strict emission regulations. Therefore, countries around the world have increased their research and development efforts on alternat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01D53/94B01D53/72
Inventor 王平立贾莉伟张云岳军王家明周玉龙林帅帅华耀朱云吴嘉昉蒲琦伟韩飞邱祎源
Owner WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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