Preparation method for Cr-Ce composite degradation material for automobile tail gases

Abstract

The invention discloses a preparation method for a Cr-Ce composite degradation material for automobile tail gases. The degradation material is prepared from the following raw materials: tetraethylammonium hydroxide, potassium hydroxide, ferric sulfate, silicon dioxide, fly ash, chromium nitrate, cerium nitrate, aluminum oxide powder and the like. According to the method disclosed by the invention,a molecular sieve is prepared by crystallization of the silicon dioxide, a microporous crystal structure and high-temperature high-humidity-heat resistance of the molecular sieve are utilized, the molecular sieve is used as a carrier of a treatment material of the automobile tail gases, the fly ash is processed by an acid, the processed fly ash is processed by an alkali, then the processed fry ash is used as a base body to load a Cr-Ce composite oxide, so that degradation space is provided for organic pollution, and adsorption and degradation types of organic matter are greatly increased; andCr-Ce composite particles are deposited into the structurally-stable carrier through chemical impregnation and ultrasonic treatment methods, and the degradation material has a very good catalytic effect on nitrogen oxides in the tail gases, improves a conversion rate of the nitrogen oxides, effectively reduces pollution to the environment caused by waste-gas emission, satisfies the demand for current automobile tail gas treatment, and can realize industrialized production.

Description

technical field [0001] The invention relates to the technical field of air purification, in particular to a preparation method of a Cr-Ce composite automobile exhaust degradation material. Background technique [0002] With the development of society and economy, automobiles have gradually entered thousands of households, and with it comes the problem of automobile exhaust emissions. The harmful substances in automobile exhaust are mainly hydrocarbons, carbon monoxide, nitrogen oxides and particulate pollutants. The harmful gases in automobile exhaust are discharged into the environment, which will cause great harm to the living environment of human beings. There is an urgent need to develop high-activity, high-selectivity, and low-cost automotive exhaust purification materials to effectively control the emission of harmful substances and protect the ecological environment and human health. [0003] At present, the treatment technologies for nitrogen oxides in automobile ex...

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Problems solved by technology

As a common adsorption raw material, zeolite usually needs to add silicon and aluminum chemical reagents to adjust the silicon-alumina ratio during its preparation and synthesis, and most of them need to add an organic template agent, but the synthetic zeolite is often a mixture of various crystal phases, and the purity is not too high. It also limits its use as an organic pollution adsorption matrix.