Method for reducing exhaust emission of engine

Abstract

A method for reducing exhaust emission of an engine comprises a carrier raw material forming a carrier and a catalyst raw materials forming a catalyst, the carrier raw material is a non-water-solublecomponent, and the catalyst raw material is a water-soluble component. The preparation method comprises the following steps: putting the carrier raw material and a pore-foaming agent into an aqueous solution of a catalyst, then carrying out ball-milling mixing, then carrying out freeze drying, and carrying out roasting treatment after freeze drying to obtain a blocky catalyst. The catalyst raw material comprises a titanium source, a tungsten source and a vanadium source. Two forms of substances are adopted for matching, the catalyst raw material which can be dissolved in water is used as a ball-milling liquid phase, the carrier raw material insoluble in water is adopted as a ball-milling solid phase, and the liquid phase and the solid phase are completely mixed during the ball-milling process so as to obtain the uniformly-distributed catalyst, such that the finally obtained catalyst is the porous substance, and has characteristics of good high temperature resistance, good water resistance, good sulfur resistance, and long activity maintaining time.

Description

technical field [0001] The present application relates to a method of reducing engine exhaust emissions. Background technique [0002] Automobile exhaust is the exhaust gas generated during the use of automobiles, which contains a lot of pollutants, the main pollutants are carbon monoxide, carbon dioxide, nitrogen oxides and so on. Among the above-mentioned pollutants, nitrogen oxides mainly refer to nitric oxide and nitrogen dioxide, which are harmful gases to the human body, especially to the respiratory system. Exposure to air with a concentration of nitrogen dioxide of 9.4 mg / m3 for 10 minutes can cause dysfunction of the human respiratory system, which shows that it is more harmful. In addition, nitrogen oxides are also one of the main raw materials for producing photochemical smog, so how to reduce the content of nitrogen oxides has become the top priority in dealing with automobile exhaust pollution. In how to reduce nitrogen oxides in the device, the catalyst can p...

AI Technical Summary

Problems solved by technology

In how to reduce nitrogen oxides in the device, the catalyst can play a vital or even decisive role, so there are many studies on the catalyst, but the existing catalysts have the ability to reduce nitrogen oxides, resistance to extreme conditions And the time that the activity can be maintained needs to be further improved

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