A kind of pretreatment method of low carbon alkane dehydrogenation catalyst

Abstract

The invention discloses a pretreatment method for a low-carbon alkane dehydrogenation catalyst. Cr-based dehydrogenation catalyst is semi-dried and dehydrated to obtain a semi-dried catalyst; (3) The catalyst obtained in step (2) is impregnated with an organic solvent solution containing silicon ester, then dried and roasted by a programmed temperature to obtain a low-carbon alkane dehydration catalyst. hydrogen catalyst. The catalyst treated by the method of the invention has high mechanical strength, good conversion rate and selectivity for dehydrogenation reaction, simple preparation method and is suitable for industrial application.

Description

technical field [0001] The invention relates to a pretreatment method of a low-carbon alkane dehydrogenation catalyst. Background technique [0002] The development of shale gas in North America has led to a sharp decline in natural gas prices relative to crude oil prices, while the production of large condensate liquids (NGLs) in shale gas has also increased rapidly. Shale gas condensate is rich in low-carbon alkanes such as ethane, propane, and butane. Ethane can be used as a cracking raw material to produce ethylene. Therefore, FCC technology alone cannot meet the rapidly growing demand for propylene. Dehydrogenation of low-carbon alkanes in natural gas (conventional natural gas, shale gas, coalbed methane, combustible ice, etc.) to produce low-carbon olefins is an effective way to solve this problem. Moreover, with the increasing scarcity of petroleum resources, the production of propylene has changed from relying solely on petroleum as a raw material to diversifying th...

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Problems solved by technology

However, the molecular sieve catalyst is a microporous material, and the pore size is smaller than the molecular diameter of the silicon ester, so the silicon ester molecules cannot enter the pores of the molecular sieve, and can only adjust the acidity of the outer surface of the molecular sieve.

Alumina is a mesoporous material with a large pore size, and silicon ester molecules can enter the pores of alumina, and the SiO remaining in the pores after calcination 2 It not only changes the internal structure of the pores, but also affects the loaded main catalytic components, and even blocks the secondary pores, so that the active components in the secondary pores cannot contact the reactants to carry out the catalytic reaction.

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