Organic-inorganic hybrid mesoporous catalyst for purifying VOCs (volatile organic compounds) and method for preparing organic-inorganic hybrid mesoporous catalyst

Abstract

The invention discloses an organic-inorganic hybrid mesoporous catalyst for purifying VOCs (volatile organic compounds) and a method for preparing the organic-inorganic hybrid mesoporous catalyst. SBA-15 mesoporous molecular sieves are used as carriers of the organic-inorganic hybrid mesoporous catalyst, organic groups (phenyl groups, amino groups and sulfhydryl groups) and transition metal oxide (oxide of Mn, Fe and Co) are used as active components of the organic-inorganic hybrid mesoporous catalyst, and chloride of alkali metal or alkaline-earth metal is used as an auxiliary of the organic-inorganic hybrid mesoporous catalyst. The specific surface area of the organic-inorganic hybrid mesoporous catalyst ranges from 700 m<2>/g to 900 m<2>/g, and the average pore diameter of pore passages in the organic-inorganic hybrid mesoporous catalyst ranges from 8 nm to 15 nm. The method includes supporting the organic groups on the SBA-15 molecular sieves by the aid of an in-situ solvent thermal synthesis process; modifying the SBA-15 mesoporous molecular sieves by the transition metal oxide by the aid of an impregnation process to obtain the organic-inorganic hybrid mesoporous catalyst. The organic-inorganic hybrid mesoporous catalyst and the method have the advantages that the organic-inorganic hybrid mesoporous catalyst has large mesoporous pore diameters and the large specific surface area and is high in catalytic activity, catalytic active constituents are good in dispersibility, acid centers can be reinforced, and the method is simple and feasible and is low in cost; the VOCs can be converted into harmless carbon dioxide and water under synergy of the organic-inorganic hybrid mesoporous catalyst and low-temperature plasma technologies at the normal temperature, and the organic-inorganic hybrid mesoporous catalyst has few byproducts and is difficult to inactivate.

Description

technical field [0001] The invention belongs to the technical field of volatile organic gases (VOCs) removal, and in particular relates to an organic-inorganic hybrid mesoporous catalyst for purifying VOCs and its preparation method and application. Background technique [0002] Volatile organic gases (VOCs) are photochemically active, can produce ozone pollution, and form secondary organic aerosols. They are one of the important precursors of air pollution and will cause certain harm to human health. The emission of volatile organic pollutants in my country is increasing year by year, and the pollution of typical industries is very serious, causing photochemical smog, urban haze and other compound air pollution problems are becoming more and more serious. [0003] The application of traditional VOCs treatment technology with large air volume and low concentration is restricted by factors such as investment, operating costs and efficiency. Low-temperature plasma catalytic te...

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Problems solved by technology

Noble metal catalysts (such as Pt, Pd, etc.) have high catalytic activity and low light-off temperature, but they are expensive, and the active components are easy to volatilize and sinter; transition metal catalysts are cheap, but their complete conversion temperature is high; perovskite catalysts and Its mixed or composite oxide catalyst has stable structure at high temperature and low price, but its disadvantages are low low temperature activity and high light-off temperature

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