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Catalyst for purifying automobile exhaust

A technology for purifying catalysts and automobile exhaust gas, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of low pollutant conversion rate, high price, deactivation, etc. environment, the effect of avoiding churn

Active Publication Date: 2013-02-13
SHANXI PROVINCIAL RES INST OF COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the active components of automobile exhaust purification catalysts commonly used are noble metals, such as combinations of Rh-Pt, Rh-Pd, Rh-Pt-Pd, and Pt-Pd, which have good ignition activity, good aging resistance, and anti-poisoning ability Strong and other advantages, but due to the shortage of resources and high price, the cost of the whole catalyst is relatively high, which limits the application of this type of catalyst
[0003] In order to reduce costs, people began to study the replacement of noble metal catalysts with non-precious metal catalysts, such as: Co-BEA (Italian patent: MI 93A 2337), Fe-Mo / ZSM-5 (Chinese patent: publication number CN1401412A), Pt / Al 2 o 3 (R.Burch, J.Catal.176 (1998) 204), etc., these reported catalysts are not active, poor stability, easy to be caused by SO 2 , water vapor poisoning and deactivation, and the conversion rate of pollutants is low; thus, it affects the practicability of the catalyst

Method used

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  • Catalyst for purifying automobile exhaust
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  • Catalyst for purifying automobile exhaust

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 1. Preparation of mesoporous catalysts: Cu, Al, Cr, and Ag were respectively loaded onto the inner channel surface of mesoporous molecular sieve SBA-15 with a pore size of 30-50 nm by impregnation method to obtain a mesoporous catalyst Cu-Al / SBA -15, Cr / SBA-15 and Ag / SBA-15; among them, the mass fraction of Cu and Al in Cu-Al / SBA-15 is 13.7%, and the mass ratio of Cu and Al is 1:2; Cr / SBA- The mass fraction of Cr in 15 is 7.0%; the mass content of Ag in Ag / SBA-15 is 5.5%;

[0015] 2. The first layer of coating: coating the alumina and additive slurry on the cyanite honeycomb carrier and drying it; the mass ratio of alumina and additives is 5:1; the additives are lanthanum oxide and cerium oxide , its mass ratio is 1:1;

[0016] 3. Mix the Cu-Al / SBA-15, Cr / SBA-15, and Ag / SBA-15 prepared in step 1 in a mass ratio of 2:2:1 and add them to a ball mill to effectively grind and mix them, and mix them Finally, it is a mesoporous material, and then it is evenly stirred with a...

Embodiment 2

[0022] 1. Preparation of mesoporous catalyst: Al / SBA-15 was prepared by in situ synthesis method, then Fe-Al / SBA-15 was obtained by impregnation method, and Cr / SBA-15, Mn / SBA-15 were directly prepared by impregnation method , that is, Fe, Al, Cr, and Mn are loaded onto the surface of the inner channel of mesoporous molecular sieve SBA-15 with a pore size of 5-20 nm; wherein, the mass fraction of Fe and Al in Fe-Al / SBA-15 is 12.3%, and Fe The mass ratio of Al and Al is 1:3; the mass fraction of Cr in Cr / SBA-15 is 8.4%; the mass content of Mn in Mn / SBA-15 is 6.1%;

[0023] 2. The first layer of coating: coating the alumina and additive slurry on the aluminum alloy honeycomb carrier and drying it; the mass ratio of alumina and additive is 10:3; the additive is neodymium oxide and zirconium oxide , its mass ratio is 2:1;

[0024] 3. Mix Fe-Al / SBA-15, Cr / SBA-15, and Mn / SBA-15 prepared in step 1 in a mass ratio of 2:1:1 and add them to a ball mill for effective grinding and mixing....

Embodiment 3

[0030] 1. Preparation of mesoporous catalysts: V / SBA-15 was prepared by in situ synthesis method, and Co / SBA-15 was prepared by impregnation method, that is, V and Co were respectively loaded onto mesoporous molecular sieve SBA- The surface of the inner channel of 15; wherein, the mass fraction of V in V / SBA-15 is 8.6%; the mass fraction of Co in Co / SBA-15 is 7.4%;

[0031] 2. The first layer of coating: Coat the alumina and additive slurry on the cyanite honeycomb carrier and dry it; the mass ratio of alumina and additive is 3:1; the additive is titanium oxide and molybdenum oxide , its mass ratio is 1:2;

[0032] 3. Mix the V / SBA-15 and Co / SBA-15 prepared in step 1 in a mass ratio of 1:1 and add them into a ball mill to grind and mix them effectively. After mixing, they will become mesoporous materials, and then mix them with Alumina, auxiliary agent slurry is stirred evenly, is coated on the first layer of coating prepared in step 2, and described auxiliary agent is titani...

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Abstract

The invention discloses a catalyst for purifying automobile exhaust and a preparation method of the catalyst. The catalyst belongs to the technical field of environmental-protection catalysis. The catalyst is an integrated catalyst comprising a carrier and a coating. The coating is of a double-layer structure, wherein the first layer is formed by directly coating alumina and an assistant on the carrier; the second layer is formed by coating the alumina, the assistant and a mesoporous material on the first coating; and the mesoporous material comprises one or more mesoporous characteristic catalysts. The catalyst is low in cost and higher in catalyzing activity, and can greatly reduce pollutants generated in emission of the automobile exhaust such as nitric oxide, carbon monoxide and hydrocarbon carbon, so that the emission of an automobile meets a national standard (GB 18285-2005), and therefore, a purpose of protecting the environment can be achieved.

Description

technical field [0001] The invention relates to a catalyst for purifying automobile tail gas and a preparation method thereof, belonging to the technical field of environmental protection catalysis. technical background [0002] The core part of the automobile exhaust catalytic converter is the catalyst. Its working principle is to use the residual oxygen in the exhaust gas and the high temperature of the exhaust to carry out oxidation-reduction reaction on the surface of the catalyst to make harmful substances CO, hydrocarbons (HC), Nitrogen oxides (NO x ) into non-toxic CO 2 、H 2 O and N 2 , thereby reducing environmental pollution. At present, the active components of automobile exhaust purification catalysts commonly used are noble metals, such as combinations of Rh-Pt, Rh-Pd, Rh-Pt-Pd, and Pt-Pd, which have good ignition activity, good aging resistance, and anti-poisoning ability However, due to the shortage of resources and high price, the cost of the entire catal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/035B01D53/94
Inventor 薛君刘俊权赵世涛代隆军申力涛舒兴旺
Owner SHANXI PROVINCIAL RES INST OF COMM
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