The effect of ethanol on the performance of CrOx/SiO2 catalysts during propane dehydrogenation

doi:10.1016/S1872-2067(15)61042-7

Abstract

Abstract:

The effects of ethanol vapor pretreatment on the performance of CrO_x/SiO₂ catalysts during the dehydrogenation of propane to propylene were studied with and without the presence of CO₂. The catalyst pretreated with ethanol vapor exhibited better catalytic activity than the pristine CrO_x/SiO₂, generating 41.4% propane conversion and 84.8% propylene selectivity. The various catalyst samples prepared were characterized by X-ray diffraction, transmission electron microscopy, temperature-programmed reduction, X-ray photoelectron spectroscopy and reflectance UV-Vis spectroscopy. The data show that coordinative Cr³⁺ species represent the active sites during the dehydrogenation of propane and that these species serve as precursors for the generation of Cr³⁺. Cr³⁺ is reduced during the reaction, leading to a decrease in catalytic activity. Following ethanol vapor pretreatment, the reduced CrO_x in the catalyst is readily re-oxidized to Cr⁶⁺ by CO₂. The pretreated catalyst thus exhibits high activity during the propane dehydrogenation reaction by maintaining the active Cr³⁺ states.

Key words: Propane, Dehydrogenation, CrO_x/SiO₂ catalyst, Ethanol vapor pretreatment, Carbon dioxide

Lina Li, Wenliang Zhu, Lei Shi, Yong Liu, Hongchao Liu, Youming Ni, Shiping Liu, Hui Zhou, Zhongmin Liu. The effect of ethanol on the performance of CrO_x/SiO₂ catalysts during propane dehydrogenation[J]. Chinese Journal of Catalysis, 2016, 37(3): 359-366.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(15)61042-7

https://www.cjcatal.com/EN/Y2016/V37/I3/359

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The effect of ethanol on the performance of CrO_x/SiO₂ catalysts during propane dehydrogenation

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