Cleaning catalyst for automobile exhaust and preparation method of cleaning catalyst carrier

Abstract

The invention provides a cleaning catalyst for automobile exhaust and a preparation method of a cleaning catalyst carrier. The catalyst comprises a carrier, an aid coating coated on the carrier, and an active ingredient loaded on the carrier coating, wherein the active ingredient is a mixed metallic oxide of yttrium, lanthanum, cerium, zirconium, manganese, copper and nickel; the carrier contains alumina and rare-earth lanthanum cerium oxide; and the aid coating is one or several oxides containing lanthanum, cerium, yttrium and zirconium. The preparation method of the carrier comprises the following steps of: hydrolyzing anhydrous aluminum chloride to prepare high-purity alumina, and preparing a saturated solution of lanthanum and cerium nitrate; adding the saturated solution into alumina, stirring, drying, grinding, mixing with graphite and polyethylene glycol, performing mold pressing and roasting. The catalyst has the characteristics that platinum, rhodium and other precious metals are not used, the cost is low, the activity is high, the heat, ageing and oxidization resistance capabilities are high, and the preparation process is simple.

Description

technical field [0001] The invention relates to a vehicle exhaust gas purification catalyst and a preparation method thereof, in particular to a vehicle exhaust gas purification catalyst which does not use precious metals such as platinum and rhodium and a preparation method thereof. Background technique [0002] With the sharp increase in the number of automobiles in our country, the pollution caused by automobile exhaust to the environment is also becoming more and more serious. As early as the 1960s, foreign countries have carried out research and development on automobile pollution control technology, and it has reached the practical stage at present. Existing studies have shown that harmful gases can be purified by improving the performance and production process of the catalyst and its carrier, improving the combustion technology of the automobile internal combustion engine and the exhaust system of the catalyst. Among them, installing a catalytic converter to treat h...

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problems of low activity of domestic automobile exhaust purification catalysts, weak resistance to heat aging and oxidation, the use of precious metals such as platinum and rhodium, the high cost of catalyst production, and complicated production methods, the catalyst can achieve better catalytic effects and reach international standards. In order to meet the environmental protection requirements of automobile exhaust emissions, the present invention provides a catalyst for purifying automobile exhaust gas and its preparation method. The catalyst does not use precious metals such as platinum and rhodium, and has low cost, high activity, strong resistance to heat aging and oxidation, and a simple manufacturing process. Features

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