Cleaning catalyst for tail gas of automobile, and preparation method

Abstract

A catalyst for cleaning the tail gas of car by decreasing the sulfide is composed of the carrier (67-95 Wt%) consisting of alumina and the oxide of the metal chosen from La, Ce, Pr, Nd, Zr, Mg, Cr, Mn, Fe, Co and Ni, and the active component consisting of the oxide of the metal chosen from Co, Mo, Ni, W, Zr, Ti, La, Ce, Pr and Nd and the oxide of noble metal chosen from Pt, Pd and Rh. Its preparing process is also disclosed.

Description

A kind of automobile exhaust gas purification catalyst and preparation method thereof technical field The invention relates to an automobile tail gas purification catalyst and a preparation method thereof. Background technique In recent years, with the gradual strictness of environmental protection regulations, the quality of gasoline has seriously affected the treatment of vehicle exhaust and the control of pollutant emissions. Due to the small proportion of catalytic cracking gasoline in foreign countries, mainly hydrogenated and isomerized gasoline, even if the crude oil with high sulfur content in the Middle East is processed, the sulfur content in the finished gasoline will not be too high, so in foreign countries, especially in developed countries such as Europe and the United States In China, the sulfur content in gasoline will not have a great impact on the use of automobile exhaust purification catalysts, and there are few reports on the development of anti-sulfur...

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Problems solved by technology

However, the precious metals on the surface of alumina are easy to migrate and aggregate at high temperature, and the sintering of precious metal particles occurs, which will greatly reduce the number of active centers of the precious metals, and reduce the characteristics of the catalyst, such as light-off characteristics, air-fuel ratio and durability, etc.

These existing anti-sulfur catalysts are aimed at the influence of low-concentration and short-term exhaust gas sulfide, but cannot resist the influence of high-concentration sulfide

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