Catalyst for catalytic ozonation of volatile organic compounds and preparation method thereof

Abstract

The invention relates to a catalyst for catalytic ozonation of volatile organic compounds and a preparation method thereof, and belongs to the technical field of catalytic ozonation of VOCs. The catalyst comprises zeolite and a metal oxide, and the metal oxide is loaded on the zeolite. The raw material of zeolite used for preparing the catalyst is Y zeolite, and the silica-alumina ratio in the Y zeolite is not less than 5. The specific surface area of the catalyst is 500-800m < 2 > g <-1 >. The particle size of the catalyst is 200 nm to 300 nm. The dispersity of active components of the catalyst on the surface of the carrier is high, the number of catalytic active sites is large, and the catalytic efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of catalytic ozone oxidation of VOCs, and more specifically relates to a catalyst for catalytic oxidation of volatile organic compounds by ozone and a preparation method thereof. Background technique [0002] With the development of industry, the emission of volatile organic compounds (VOCs) is becoming more and more serious. VOCs are the main pollutants in the atmospheric environment, long-term exposure will cause serious environmental problems and threaten human health. In recent years, the state has issued a series of related governance policies and laws and regulations, which shows that the prevention and control of VOCs pollution is imminent. [0003] Various technologies have been researched and developed to degrade VOCs, including adsorption recovery technology, catalytic combustion technology, biodegradation technology, etc., but these technologies inevitably have certain defects. When VOCs are use...

AI Technical Summary

Problems solved by technology

However, the low removal efficiency of VOCs catalytic oxidation using ozone at low temperature seems to be one of the key factors affecting the development of this technology.

In addition, the low mineralization rate of some VOCs is also an urgent problem to be solved

In the ozone catalytic oxidation process, the catalytic efficiency is inseparable from the exposure of the active components on the catalyst surface. However, when the catalyst is prepared by the traditional impregnation method, the metal oxides tend to agglomerate on the surface of the support, which is not conducive to the catalytic active sites. point of exposure, therefore, more efficient catalysts must be designed to increase the efficiency of ozone catalytic oxidation

[0005] After retrieval, the publication number is CN110237808A, and the patent titled "A Method for Silylation Modification of Y Molecular Sieve" discloses a catalyst containing Y molecular sieve. The final Y molecular sieve and modifying reagent are evenly mixed according to a certain ratio, placed in a reaction kettle and closed for a certain period of time at a certain temperature. After cooling to room temperature, the solid-phase product is washed and dried with an organic reagent to obtain the final product; use this The molecular sieve produced by the scheme can improve the loading of catalytically active components to a certain extent, but there is still the problem of poor distribution of metal oxides on the surface of the carrier, which limits the catalytic effect

Images