Preparation method and application of molecular sieve photocatalyst for vocs degradation

Abstract

The invention discloses a preparation method and application of a molecular sieve photocatalyst for degradation of VOCs. The type of the molecular sieve photocatalyst is ZSM-5, beta and Y-type zeolite of an MFI structure. A zeolite molecular sieve is subjected to high-temperature calcining treatment through organic acids in different atmospheres, so that the microscopic chemical property on the surface of the molecular sieve is controlled. The molecular sieve is modified and applied to an isopropanol photocatalysis experiment, only a small amount of carbon dioxide is produced, the amount of acetone is nearly zero, while lots of propylene is produced. Controllable switching of the isopropanol photocatalysis reaction process in three different reaction paths, namely selective oxidation, selective mineralization and selective conversion of the propylene is realized. The catalyst is simple in treatment process, low in cost, short in period, high in propylene yield and less in CO2 emission and has wide application prospects.

Description

technical field [0001] The invention belongs to the field of preparation of photocatalyst materials, and in particular relates to a preparation method and application of a molecular sieve photocatalyst used for VOCs degradation. Background technique [0002] In recent years, scientists at home and abroad have carried out a lot of work on the nature of zeolite molecular sieve photocatalysis and the application of environmental purification and achieved fruitful results. Compared with traditional semiconductor materials, zeolite molecular sieves exhibit different photocatalytic behaviors in the treatment of complex component pollutants and selective organic synthesis due to their periodic pore structure characteristics and unique catalytic shape-selective advantages, highlighting potential applications prospect. As the global temperature is getting warmer today, how to reduce carbon emissions is becoming a hot and difficult research topic for scientists today. Although the p...

AI Technical Summary

Problems solved by technology

Using the organic matter treatment method to remove VOCs in the waste gas, the whole treatment process is simple and easy to operate, the treatment efficiency is high, the required equipment is small, and the energy consumption of the equipment is low, which is of great significance to save resources and reduce costs, but this method will inevitably produce more big secondary pollution

[0006] In the above reports, there are problems to be solved such as high temperature for complete elimination of VOCs, low conversion rate of exhaust gas, poor selective adsorption, high cost, cumbersome preparation process, and virtually increased carbon emissions.

Images