A kind of methane halogen oxidation catalyst and its preparation method and application

Abstract

The invention discloses a catalyst for methane oxyhalogenation as well as a preparation method and an application of the catalyst. The core of the catalyst is zinc supported alumina, wherein content of alumina L acid is smaller than 0.2 mmol.g<-1>; BET specific surface area is 200-350m<2> / g; pore volume is 0.3-0.6 ml / g; the shell is alumina containing zirconium sulfate solid acid and a molecular sieve, and the molecular sieve is at least one of a 5A molecular sieve, a 13X molecular sieve and a mordenite molecular sieve; the weight ratio of zinc supported alumina to alumina containing zirconiumsulfate solid acid and the molecular sieve is 10:1-2:1; based on the weight of alumina containing zirconium sulfate solid acid and the molecular sieve as the baseline, the weight content of zirconiumsulfate solid acid is 8wt%-15wt%, and the content of the molecular sieve is 3wt%-7wt%; based on the weight of zinc supported alumina as the baseline, content of zinc in terms of oxide is 5wt%-30wt%.The catalyst has the advantages that methane conversion rate and selectivity of halomethane as a target product are increased simultaneously, deep oxidation of halomethane is inhibited, and yield of halomethane is increased obviously.

Description

technical field [0001] The invention relates to a methane halogen oxidation catalyst and its preparation method and application, in particular to a low-temperature high-activity, selective methane halogen oxidation conversion catalyst and its preparation method and application. Background technique [0002] Methane does not directly react with halogen, but uses HCl, HBr or metal halide as a halogen source, and the process of reacting with the participation of oxygen to form halide is called halogen oxidation reaction. This method was first applied to the industrial production of chlorine by catalytic oxidation of HCl, known as the Deacon process. [0003] The early methane halogen oxidation reaction mainly used HCl as the halogen source, and the catalyst mainly used CuCl 2 As the active component, Bromhead et al. (Bromhead J, Font-Freide J J, Westlake D J. Process for the production of methyl or ethyl mono-chloride or bromide. EP. Patent, 0117731.1984-09-05) loaded CuCl on ...

AI Technical Summary

Problems solved by technology

[0009] The methane halogen oxidation reaction in the prior art has the following technical problems. High temperature is beneficial to improve the conversion rate of methane, but it will cause deep oxidation of the generated methyl halides, especially monohalomethanes, to generate CO or CO 2 , which significantly reduces the selectivity of methyl halides, resulting in low yields of methyl halides. Therefore, it is of great significance to develop a catalyst for the methane halooxidation reaction with high methane conversion and selectivity of methyl halides.

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