Supported non-metal catalyst, preparation method and application of catalyst

Abstract

The invention relates to a supported non-metal catalyst, a preparation method and an application of the catalyst in catalyzing oxidative dehydrogenation of low-carbon alkanes. The supported non-metalcatalyst comprises a boron oxide and silicon oxide, wherein the boron oxide is supported on the silicon oxide, the boron oxide accounts for 0.1-30% by mass. The supported non-metal catalyst provided by the invention is prepared by a simple preparation method, takes porous silicon oxide with weak surface acidity as a carrier, has highly dispersed active sites (tri-coordinated boron oxide species),and does not easily catalyze deep oxidation of olefins. B-O-Si bonds formed by roasting fixedly support the active boron species, so that the active components of the catalyst are not easy to lose andthe catalyst has good stability. In the catalysis of oxidative dehydrogenation of low-carbon alkanes, the catalyst leads to high conversion of alkanes and olefin yields at a lower temperature (400 DEG C) due to the rich active tri-coordinated boron oxide species and the oxygen-affinity of boron sites of the catalyst, and the amount of CO2 generated can be neglected.

Description

technical field [0001] The invention relates to the field of industrial catalysis, in particular to a supported non-metallic catalyst, a preparation method and its application in catalyzing the oxidative dehydrogenation of light alkanes. Background technique [0002] Low-carbon olefins are important raw materials for the chemical industry and can be used to produce various chemicals such as high molecular polymers, rubber, and gasoline additives. The traditional production process of light olefins mainly includes steam cracking and catalytic cracking processes from petroleum, which have high reaction temperature, high energy consumption and complicated separation process. And with the increasing demand for low-carbon olefins in the chemical market, the traditional preparation process has been unable to meet the market demand. On the other hand, my country's oil resources are increasingly scarce, and olefin production is facing severe resource pressure. Natural gas, coal-bed...

AI Technical Summary

Problems solved by technology

[0007] For this reason, the technical problem solved by the present invention is to use existing catalysts to catalyze low-carbon alkanes, olefins have low selectivity, and are easy to catalyze deep oxidation of olefins, thereby providing a supported non-metallic catalyst. The preparation method of the catalyst is simple, with highly dispersed active sites (three-coordinate boron oxide species), used for the oxidative dehydrogenation of low-carbon alkanes, and can have high alkane conversion and olefin yield at lower temperatures, CO 2 The amount of formation is negligible, the active components of the catalyst are not easy to lose, and the stability is good

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