Catalyst for VOCs catalytic combustion and its preparation method

Abstract

The catalyst provided by the invention is an integrated catalyst; the catalyst takes a honeycomb ceramic matrix as a framework, an aluminum oxide as a coating, and Co, La and Ce as active components;the components are matched with specific content, the catalyst has big specific area and many activity sites while good structure and coating stability. The catalyst is applied to the catalytic combustion reaction of methylbenzene and ethyl acetate, and has high catalytic activity. Meanwhile, the catalyst has stable repeat using activity, and overcomes the shortcomings of poor high-temperature stability and bad repeat using activity of the traditional noble metal catalyst. The experiment indicates that through sonic oscillation, the drop rate of coating is 2% below. When the catalytic combustion temperature is 350 DEG C, the methylbenzene conversion rate is 93.67-95.97%, the ethyl acetate conversion rate is 92.65-95.64%. Through evaluation for continuous 1000 hours, the reaction conversionrate keeps stable.

Description

technical field [0001] The invention relates to the technical field of chemical catalysts and their preparation, in particular to a catalyst for catalytic combustion of VOCs and a preparation method thereof. Background technique [0002] Most of VOCs are toxic and can cause acute and chronic poisoning, even carcinogenesis and mutation. At the same time, VOCs as PM 2.5 precursors, will cause direct or indirect harm to human health. Therefore, the emission of VOCs poses a great threat to human health and the ecological environment. When the VOCs of halogenated hydrocarbons diffuse into the ozone layer, they will chemically react with ozone, resulting in a decrease in ozone concentration, forming an ozone hole, and causing a series of ecological disasters such as the greenhouse effect. Some VOCs of aldehydes and ketones react photochemically with nitrogen oxides in the air under light conditions to form photochemical smog, causing more serious secondary pollution. [0003] A...

AI Technical Summary

Problems solved by technology

The loaded active components are dispersed on the surface of the carrier, mostly precious metals such as Pt, Pd, Ru, etc., and the treatment effect is ideal, but there are disadvantages such as easy poisoning and poor high temperature stability. Therefore, the repeated use activity is poor and the price is expensive

When the active component is a transition metal oxide, there are disadvantages such as low catalytic activity and poor catalytic effect of the catalyst.

Images