Light-alkane dehydrogenation-to-olefins catalyst and preparation method thereof

Abstract

The invention discloses a light-alkane dehydrogenation-to-olefins catalyst and a preparation method thereof. The catalyst contains, by weight, 0.1-0.5% of a SiO2 coating, 0.05-0.8% of Pt element, 0.1-5.0% of Sn element, 0.1-5.5% of an auxiliary agent, and the rest of active Al2O3. The thickness of the SiO2 coating is 0.01-10 nm. The preparation method comprises the following steps: (1) loading an active ingredient Pt onto an active Al2O3 carrier, drying and roasting; (2) carrying out saturated impregnation-calcination by the use of an impregnation liquid containing promoter metal, and carrying out semi-dry dehydration; (3) impregnating a catalyst precursor obtained in the step (2) by the use of an organic solvent solution containing estersil; and (4) drying the catalyst precursor obtained in the step (3), and roasting so as to obtain the catalyst. The surface of the catalyst is smooth and wear-resistant and has low abrasion. The catalyst is more suitable for moving-bed dehydrogenation process and has good conversion rate of alkanes and good olefin selectivity in the light-alkane dehydrogenation reaction.

Description

technical field [0001] The invention relates to a low-carbon alkane dehydrogenation olefin catalyst and a preparation method thereof. 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 ...

AI Technical Summary

Problems solved by technology

For mesoporous materials such as alumina, the pore size is larger, 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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