A kind of Gan catalyst and preparation method thereof and application in catalytic n-butane oxidative dehydrogenation reaction

Abstract

The invention discloses a GaN catalyst, a preparation method thereof and an application in catalyzing the oxidative dehydrogenation reaction of n-butane. The catalyst uses any one of γ-Al2O3, SiO2, carbon nanotubes, and Ti-modified SBA-15 as a carrier, and supports 2wt% to 20wt% GaN. The carrier is mixed and ground with GaN powder, and finally Made by granulation and screening. The method requires low temperature for preparing the catalyst, and the preparation process is simple and no organic solvent is used. When the obtained catalyst is used to catalyze the oxidative dehydrogenation of n-butane to prepare olefins, the conversion rate of n-butane and the selectivity of olefins are better than (or at least not lower than) the reported catalysts, while the stability and catalytic efficiency are significantly improved. High, much higher than the reported catalysts.

Description

Technical field [0001] The invention belongs to the technical field of catalyst preparation, and particularly relates to a catalyst for preparing olefins by the oxidative dehydrogenation of n-butane and a preparation method of the catalyst. Background technique [0002] With the development of the world petroleum industry, global fossil energy is increasingly being exploited and utilized on a large scale, and the output of low-carbon alkanes is also increasing year by year. However, (part of) low-carbon alkanes are only burned as low-value fuels in our country, and their high-efficiency and high-value-added utilization is low, which reduces the utilization rate of petroleum resources and brings environmental pollution. The use of low-carbon alkanes to develop olefins with high added value is of great significance to the development of the energy industry and the polymer material industry. At present, my country’s petroleum refining and chemical enterprises produce a large amount...

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Problems solved by technology

However, a batch reactor was used in the study for the catalytic reaction, and the catalyst and its distribution in the reactor largely limited the effective contact between GaN and the alkane substrate, resulting in a very low alkane conversion rate (reaction 4 hours, conversion rate is less than 10%), catalytic efficiency is low (the volume space velocity of alkane is 28L·kg -1 cat h -1 ) and the reaction process is difficult to scale up, so it is still impossible to realize the efficient conversion and utilization of low-carbon alkane resources

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