Preparation method for supported catalyst for catalyzing combustion of VOCs (Volatile Organic Compounds)

Abstract

The invention belongs to the technical field of environmental protection and catalysts, and in particular relates to a preparation method of a supported catalyst for catalytic combustion of VOCs. It is made of ZSM-5 molecular sieve with high specific surface area and metal precursor; it is dried on ZSM-5 molecular sieve with high specific surface area to remove the adsorbed moisture; then the metal precursor is mixed with water, stirred and dissolved to obtain a solution; The prepared solution is stirred and mixed with the pretreated ZSM‑5 molecular sieve, left standing, dried, calcined, and cooled to normal temperature to obtain a supported catalyst for catalytic combustion of VOCs. The catalyst of the present invention uses ZSM-5 molecular sieve with high specific surface area as the carrier, which can reduce the amount of active components and cost, and at the same time, facilitate the adsorption of pollutants on the surface of the catalyst. The catalytic oxidation ability of the catalyst to VOCs is improved, and the benzene series (such as toluene) in the VOCs can be efficiently removed by catalytic combustion at low temperature. Moreover, the catalyst has low cost, simple process, good hydrothermal stability and sulfur resistance performance.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and catalysts, and in particular relates to a preparation method of a supported catalyst for catalytic combustion of VOCs. Background technique [0002] Volatile Organic Compounds (VOCs for short) in the exhaust gas of fine chemical, petrochemical, pharmaceutical and other industries are the most typical pollution sources of the current atmospheric environment. There are many types of them, mainly including: benzene series, olefins, alcohols, aldehydes Classes, organic chlorides, etc. Most VOCs gases are poisonous and odorous, and some VOCs such as benzene series (benzene, toluene, xylene, etc.) even have strong carcinogenicity and genotoxicity. With the rapid development of the economy, especially in some coastal cities where the light industry is relatively concentrated, the discharge of industrial waste gas containing benzene series is increasing, which poses a huge threat to ...

AI Technical Summary

Problems solved by technology

However, the limitation of macromolecular diffusion caused by the single micropore structure on the traditional ZSM-5 zeolite molecular sieve seriously hinders its application as a carrier in VOCs catalytic combustion catalysts.

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