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A kind of automobile exhaust gas purification catalyst and preparation method thereof

A technology for purifying catalysts and automobile exhaust, applied in the direction of physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of reduced effective utilization of precious metals, migration of active components, etc., and achieves easy control of preparation process conditions, strong Adsorption, the effect of simple preparation method

Active Publication Date: 2018-03-06
SINOCAT ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In patent CN102909020A, the aluminum sol is coated on the first layer, and then the required component alumina slurry is used as the outer coating, and finally the active component is impregnated on the coating. The disadvantage of this patent is that the active component impregnated last The branch will migrate to the internal coating and ceramic carrier, resulting in a reduction in the effective use of precious metals

Method used

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  • A kind of automobile exhaust gas purification catalyst and preparation method thereof

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Effect test

Embodiment 1

[0035] Add a binder to 49g of γ-Al2O3 and 441g of molecular sieve, add a certain amount of deionized water, and ball mill to make a slurry. The obtained slurry is uniformly coated on a hole number of 400cell / in 2 , on a cordierite honeycomb ceramic carrier with a volume of 13.16ml, the coating amount was 0.658g, vacuum-dried at 80°C, and calcined at 500°C for 1h to obtain catalyst 1. Weigh platinum nitrate and palladium nitrate salt solutions (containing Pt6.98g and Pd27.92g) respectively, add deionized water, add 965g gamma-Al2O3 powder into it, stir quickly and evenly, let stand for more than 30min, and then vacuum dry at 90°C to Constant weight, and then roasted at 500°C for 2 hours to obtain precious metal powder. Mix the precious metal-containing powder with a binder, add a certain amount of deionized water, and ball mill to make a slurry, which is evenly coated on catalyst 1 with a coating amount of 1.1186g, dried and calcined to obtain the target catalyst.

Embodiment 2

[0037] Add binder to 122.5g gamma-Al2O3 and 367.5g molecular sieve, add a certain amount of deionized water, and ball mill to make slurry. The obtained slurry is uniformly coated on a hole number of 400cell / in 2 , on a cordierite honeycomb ceramic carrier with a volume of 13.16ml, the coating amount was 0.658g, vacuum-dried at 80°C, and calcined at 500°C for 1h to obtain catalyst 1. Weigh platinum nitrate and palladium nitrate salt solutions (containing Pt6.98g and Pd27.92g) respectively, add deionized water, add 965g gamma-Al2O3 powder into it, stir quickly and evenly, let stand for more than 30min, and then vacuum dry at 90°C to Constant weight, and then roasted at 500°C for 2 hours to obtain precious metal powder. Mix the precious metal-containing powder with a binder, add a certain amount of deionized water, and ball mill to make a slurry, which is evenly coated on catalyst 1 with a coating amount of 1.1186g, dried and calcined to obtain the target catalyst.

Embodiment 3

[0039] Add a binder to 49g of γ-Al2O3 and 490g of molecular sieve, add a certain amount of deionized water, and ball mill to make a slurry. The obtained slurry is uniformly coated on a hole number of 400cell / in 2 , on a cordierite honeycomb ceramic carrier with a volume of 13.16ml, the coating amount was 1.1186g, vacuum-dried at 80°C, and calcined at 500°C for 1h to obtain Catalyst 1. Weigh platinum nitrate and palladium nitrate salt solutions (containing 12.0g of Pt and 48.0g of Pd) respectively, add deionized water, add 965g of γ-Al2O3 powder into it, stir quickly and evenly, let it stand for more than 30min, and then vacuum dry at 90°C to Constant weight, and then roasted at 500°C for 2 hours to obtain precious metal powder. Mix the precious metal-containing powder with a binder, add a certain amount of deionized water, and ball mill to make a slurry, which is evenly coated on the catalyst 1 with a coating amount of 0.658g, dried and calcined to obtain the target catalyst....

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Abstract

The invention discloses an automobile tail gas purification catalyst and a preparation method thereof. The catalyst is composed of a carrier and a catalyst coating coated on the carrier; the catalyst of the present invention is a double-coated catalyst, wherein the first layer is made of alumina and molecular sieve; the second coating is a precious metal coating, and the method of impregnation is used to Precious metals are fixed on the material, reducing the impact of uneven dispersion of precious metals caused by the later migration of precious metals. The first coating of the catalyst of the present invention is a non-precious metal coating, the cost is lower than that of the noble metal coating, and the molecular sieve and alumina have a strong adsorption effect, especially at low temperature, a large amount of methane is adsorbed, thereby promoting a small amount of methane to react with the active material of the second layer , to achieve the effect of rapid ignition; the second coating is a noble metal coating, and the concentration of noble metal in the coating is high, which can play the role of low-temperature ignition.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, in particular to the technical field of automobile exhaust gas purification catalysts, in particular to an automobile exhaust gas purification catalyst and a preparation method thereof. Background technique [0002] Since its birth in 1886, the automobile has changed human life, and is known as one of the top ten inventions affecting mankind in the 20th century. However, with the development of society, the pollution caused by automobile exhaust has attracted more and more people's attention, and the control of automobile pollution has become an urgent matter, and the development of natural gas vehicles can comprehensively reduce exhaust gas pollutants. Compared with gasoline vehicles, natural gas vehicles have the advantages of cheap fuel, high fuel efficiency, and low exhaust pollutants. However, the methane emitted by natural gas vehicles is very harmful to the environment. The g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/44B01J29/068B01J29/80B01J29/85B01D53/94B01D53/72
Inventor 王勤李云陈启章李大成程永香胡文强陈耀强王云
Owner SINOCAT ENVIRONMENTAL TECH
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