Preparation and application of boron modified boron nitride catalyst for oxidative dehydrogenation of low-carbon alkane

Abstract

The invention relates to preparation and application of a boron modified boron nitride catalyst for oxidative dehydrogenation of low-carbon alkane and relates to catalysts. A boron source and boron nitride are mixed and dissolved in a solvent; after the solvent is volatilized, heat treatment is carried out to obtain a boron modified boron nitride material. The boron modified boron nitride catalystprepared by the invention is a non-metal catalyst without any metal and has high olefin selectivity and stability when being used for the oxidative dehydrogenation of the low-carbon alkane includingethane, propane and isobutane. Compared with the boron nitride, a relatively high alkane conversion ratio can be obtained under the condition that the olefin selectivity is ensured, and the yield of olefin is improved. According to the technical scheme for preparing the boron modified boron nitride catalyst, when the boron modified boron nitride material is prepared, a method for volatilizing thesolvent can be realized through selecting common manners including heating and stirring, natural volatilization, ultrasonic evaporation, rotary evaporation or spraying drying and the like.

Description

technical field [0001] The invention relates to a catalyst, in particular to the preparation and application of a boron-modified boron nitride catalyst for oxidative dehydrogenation of low-carbon alkanes. Background technique [0002] The process of oxidative dehydrogenation of low-carbon alkanes to olefins is not limited by thermodynamics and is not affected by carbon deposition. It is currently the most promising path to replace direct dehydrogenation. (Catal. Today 2009, 141, 245-253). However, the biggest problem in the current oxidative dehydrogenation reaction is that the introduction of oxygen intensifies the occurrence of deep oxidation and reduces the selectivity of the target product olefins, so the development of efficient catalysts is still an urgent problem to be solved in the oxidative dehydrogenation of alkanes (Science 2016, 354, 1570-1573). Most current metal oxide-based catalysts rarely yield more than 20% olefins (Catal.Today 2007, 127, 113-131), and on ...

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Problems solved by technology

Usually, the single-pass yield of olefins produced by the oxidative dehydrogenation reaction of the same amount of raw materials is even lower than that of the direct dehydrogenation reaction, which will cause an extreme waste of raw materials, and at the same time, the carbon oxides released by excessive oxidation will damage the environment The strong exothermic effect caused by the reaction also makes the alkane oxidative dehydrogenation process unable to realize industrial application so far.

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