A kind of preparation method of molecular sieve surface organic base etching and loading PT catalyst

Abstract

The invention provides a method for preparing molecular sieve surface organic alkali etching and loading Pt catalyst, using cheap ZSM‑5 molecular sieves and a small amount of chloroplatinic acid as raw materials, first using an organic alkali solution to perform silicon-dissolving etching on the molecular sieve surface treatment, and then use ethylene glycol liquid phase reduction method to support Pt to prepare Pt / molecular sieve catalyst. Use an appropriate amount of organic base to perform silicon-dissolving etching on the surface of the molecular sieve to form a rich hierarchical porous structure without destroying the molecular sieve framework, which is conducive to the dispersion and stability of Pt nanoparticles, and improves the transfer of macromolecular reactants and products. qualitative nature. In addition, the catalytic synergy between the abundant acid sites on the surface of molecular sieves and the highly dispersed oxidation centers of Pt nanoparticles can significantly improve the low-temperature oxidation performance of the catalyst for various VOCs pollutants, and the complete oxidation temperature of benzene and ethyl acetate (99 % conversion) are only 130°C and 190°C, respectively. The Pt / molecular sieve catalyst is especially suitable for the low-temperature catalytic combustion of chlorine-containing VOCs such as dichloroethane and non-chlorine-containing VOCs such as benzene and ethyl acetate discharged from industry, and has a good application prospect.

Description

technical field [0001] The invention relates to a method for preparing a catalyst, in particular to a method for preparing a molecular sieve surface by etching an organic base and supporting a Pt catalyst. Background technique [0002] Volatile organic compounds (VOCs) mainly come from waste gas emissions from industries such as petrochemical production, printing and coating, food and rubber production. They are often complex in composition and large in exhaust volume, and pose serious hazards to the natural environment and human health. Catalytic combustion technology is one of the most important and effective means for the purification and treatment of VOCs pollutants, and the development of low-cost, high-efficiency, stable and broad-spectrum catalysts is the key to the application of this technology. Molecular sieves such as ZSM-5, BETA or USY have large specific surface area, regular pore structure, and rich acidic sites, and are widely used in the fields of separation,...

AI Technical Summary

Problems solved by technology

In addition, molecular sieves such as ZSM-5 are often used as supports for supported catalysts, but the surface of these microporous molecular sieves is relatively smooth, which is not conducive to the highly dispersed loading of active components such as noble metals and limits their wide application. Therefore, improving their pore structure and surface properties, will also promote high dispersion of active components and improve their catalytic performance

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