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Automobile emission purification catalyst and preparing method thereof

A technology for purifying catalysts and automobile exhaust. It is applied in the direction of physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc. It can solve the problems of migration of active components and reduction of effective utilization of precious metals, etc., and achieve strong adsorption and preparation process conditions. Easy to control, good low-temperature ignition activity of methane

Active Publication Date: 2016-03-30
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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  • Automobile emission purification catalyst and preparing 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 emission purification catalyst and a preparing method thereof. The catalyst is prepared from a carrier and catalyst coatings with which the carrier is coated. The catalyst is a double-coating catalyst. The first coating is prepared from aluminum oxide and molecular sieves. The second coating is a precious metal coating, precious metal is fixed to a material with an immersion method, and uneven precious-metal dispersion and other influences caused by migration of precious metal in the later period are reduced. According to the catalyst and the preparing method, the first coating is a non-precious-metal coating, cost is lower than that of the precious coating, and the molecular sieves and the aluminum oxide have the high adsorption effect; particularly, a large amount of methane is adsorbed at the low temperature, then a reaction between a small amount of methane and a second active substance layer is promoted, and the rapid ignition effect is achieved; the second coating is the precious metal coating, the concentration of the precious metal in the coating is high, and the low-temperature ignition effect can be achieved.

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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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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