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La1-xAgxMnO3 perovskite type catalyst for auto tail gas purification

A perovskite type, automobile exhaust technology, applied in chemical instruments and methods, dispersed particle separation, separation methods, etc., can solve the problems of high price, poor anti-poisoning ability and thermal stability, limited resources, etc., and achieve low cost, Good anti-poisoning performance and wide range of temperature changes

Inactive Publication Date: 2006-12-20
TIANJIN UNIV
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  • Description
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Problems solved by technology

At present, the active components of catalytic converters are mainly precious metals such as Pt, Pd and Rh, which not only have limited resources, are expensive, but also have poor anti-poisoning ability and thermal stability.

Method used

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  • La1-xAgxMnO3 perovskite type catalyst for auto tail gas purification
  • La1-xAgxMnO3 perovskite type catalyst for auto tail gas purification

Examples

Experimental program
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Embodiment Construction

[0011] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. According to the accompanying drawings, we have exemplified three simple values ​​of X in the table, and other numerical values ​​are within the scope of the present invention.

[0012] 1. Catalyst test:

[0013] CH in the test feed gas used in the present invention 4 The volume specific concentration of CO is 1.5%, the volume specific concentration of CO is 0.53%, and the rest is N 2 , the airspeed is 1.5×10 4 h -1 , various ratios of La 1-x Ag x MnO 3 The compounds were tested as catalysts, and the effects are shown in the following table and accompanying drawings.

[0014]

[0015] It can be seen from the above figure that the activity is the highest when X=0.2, and the corresponding CH 4 The oxidation temperature ranges from 400°C to 550°C, and when X+ The increase of is conducive to the improvement of catalytic activity; ...

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Abstract

The invention relates to a La1-X AgXMnO3 perovskite catalyst used to purify the vehicle tail gas, wherein the A of ABO3 structure of perovskite is formed by lanthanum and silver; the B is formed by manganese; 0.05<=X<=0.4; the total mol of lanthanum and silver, the mol of manganese and oxygen mol are rated as 1:1:3; via analyzing crystal phase, the perovskite structure is 95% of catalyst. The invention can adjust the ratio of lanthanum and silver to improve the application in different vehicle discharge systems. And the invention can effectively resist to the toxicity of lead and sulfur. And it has high thermal stability, with simple structure and low cost.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a La 1-x Ag x MnO 3 perovskite catalysts. Background technique [0002] Since the 1960s, the problem of automobile exhaust pollutants has become increasingly serious, prompting researchers at home and abroad to develop various technical measures to reduce emissions. The most effective measure to purify automobile exhaust is to install a catalytic converter on the automobile exhaust system. At present, the active components of catalytic converters are mainly precious metals such as Pt, Pd and Rh, which are not only limited in resources, but also expensive in price, and have poor anti-poisoning ability and thermal stability. Therefore, the development of new high-performance / price ratio automotive catalysts has become an urgent task for Chinese researchers. Contents of the invention [0003] The purpose of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/68B01D53/94
Inventor 宋崇林吕刚董素荣范国梁高祥郭振鹏
Owner TIANJIN UNIV
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