Preparation of bimetallic oxides by redox-hydrolysis coupling reaction for low-temperature catalytic combustion of vocs

Abstract

This patent is about a new synthesis method of Mn-X (X=Fe, Co, Al, etc.) bimetallic metal oxide catalyst and its application in the field of low-temperature catalytic combustion of volatile organic compounds (VOCs). The implementation steps of this method include: converting KMnO 4 and metal strong acid salts (such as Fe(NO 3 ) 3 ·9H 2 O.Co(NO 3 ) 2 etc.) was dissolved in a certain volume of deionized water to form solution 1; add 3 times the theoretical equivalent of H 2 O 2 Dilute with deionized water to form solution 2; add solution 2 drop by drop to solution 1 at room temperature. A large amount of gas is generated during the reaction; the generated precipitate is aged overnight and then filtered, washed, dried and After high-temperature calcination, the required Mn-X bimetallic catalyst can be obtained. This method is simple and fast, and can avoid problems such as incomplete precipitation and uneven bimetal mixing faced by traditional co-precipitation methods; and the synthesized metal oxide has the advantages of large specific surface area, small nanoparticle size, etc. It is conducive to the catalytic combustion reaction of VOCs on its surface. In the low-temperature catalytic combustion reaction of toluene, the synthesized Mn-X bimetallic catalyst achieved ideal catalytic effects.

Description

technical field [0001] The invention relates to a new method for synthesizing Mn-X double metal oxides suitable for low-temperature catalytic combustion of VOCs, and belongs to the technical field of chemical catalysts and their preparation. Background technique [0002] With the development of the economy and the improvement of people's living standards, the problem of environmental pollution has attracted more and more attention. Industrial "three wastes" are an important source of environmental pollution. Among them, the waste gas has the characteristics of strong dispersion, wide pollution range, and difficulty in recycling and centralized treatment. It is the focus of industrial pollution prevention and control. Volatile organic compounds (VOCs) account for a considerable proportion of exhaust gas pollution, mainly from petrochemical, printing, coating and other industries, and their types include aliphatic hydrocarbons, aromatic hydrocarbons, halogenated hydrocarbons, ...

AI Technical Summary

Problems solved by technology

However, single metal oxides are prone to sintering during the reaction process, resulting in a shortened service life of the catalyst, so it is often necessary to increase the service life of non-noble metal catalysts by introducing a second metal

[0004] At present, the synthesis methods of Mn-X bimetallic oxides mainly include coprecipitation method and impregnation method. These methods face problems such as insufficient bimetallic mixing, long reaction cycle, and more wastewater and waste residues.

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