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

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

Lina Li ^a,b ,
Wenliang Zhu ^a ,
Lei Shi ^a ,
Yong Liu ^a ,
Hongchao Liu ^a ,
Youming Ni ^a ,
Shiping Liu ^a,b ,
Hui Zhou ^a,b ,
Zhongmin Liu ^a,,

1.
a Dalian National Laboratory for Clean Energy, National Engineering Laboratory for Methanol to Olefins, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;
2.
b University of Chinese Academy of Sciences, Beijing 100049, China

Corresponding author: Zhongmin Liu,
Received Date: 20 November 2015
Available Online: 30 December 2015

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.
- Propane,
- Dehydrogenation,
- CrO_x/SiO₂ catalyst,
- Ethanol vapor pretreatment,
- Carbon dioxide
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1.
沈阳化工大学材料科学与工程学院沈阳 110142

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

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通讯作者: 陈斌, bchen63@163.com

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