Effect of methane co-feeding on the selectivity of ethylene produced from oxidative dehydrogenation of ethane with CO2 over a Ni-La/SiO2 catalyst

能源化学(英文) ›› 2013, Vol. 22 ›› Issue (4): 653-658.

Effect of methane co-feeding on the selectivity of ethylene produced from oxidative dehydrogenation of ethane with CO₂ over a Ni-La/SiO₂ catalyst

Xiaoxi Peng, Jianqiang Zhu, Lu Yao, Changwei Hu

Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, Sichuan, China

收稿日期:2012-06-07 修回日期:2012-07-23 出版日期:2013-07-20 发布日期:2013-07-27
通讯作者: Changwei Hu
基金资助:
This work was supported by the NNSFC (Nos. 20976109, 21021001) and the Special Research Foundation of Doctoral Education of China (No. 20090181110046).

Effect of methane co-feeding on the selectivity of ethylene produced from oxidative dehydrogenation of ethane with CO₂ over a Ni-La/SiO₂ catalyst

Xiaoxi Peng, Jianqiang Zhu, Lu Yao, Changwei Hu

Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, Sichuan, China

Received:2012-06-07 Revised:2012-07-23 Online:2013-07-20 Published:2013-07-27
Supported by:
This work was supported by the NNSFC (Nos. 20976109, 21021001) and the Special Research Foundation of Doctoral Education of China (No. 20090181110046).

摘要/Abstract

摘要： A Ni-La/SiO₂ catalyst was prepared through the incipient wetness impregnation method and tested in the oxidative dehydrogenation of ethane (ODHE) with CO₂. The fresh and used catalysts were characterized by XRD and SEM techniques. The Ni-La/SiO₂ catalyst exhibited catalytic activity for the oxidative dehydrogenation of ethane, but with low ethylene selectivity in the absence of methane. The selectivity to ethylene increased with increasing molar ratio of methane in the feed. The carbon deposited on the catalyst surface in the sole ODHE with CO₂ was mainly inert carbon, while much more filamentous carbon was formed in the presence of methane. The filamentous carbon was easy to be removed by CO₂, which might play a role in improving the conversion of ethane to ethylene. The introduction of methane might affect the equilibrium of the CO₂ reforming of ethane and the ODHE with CO₂. As a consequence, the synthesis gas produced from CO₂ reforming of methane partly inhibited the reaction of ethane and promoted the ODHE with CO₂, thus increasing the selectivity of ethylene.

关键词: ethane, methane, CO₂, co-activation, Ni-La/SiO₂, ethylene selectivity

Abstract: A Ni-La/SiO₂ catalyst was prepared through the incipient wetness impregnation method and tested in the oxidative dehydrogenation of ethane (ODHE) with CO₂. The fresh and used catalysts were characterized by XRD and SEM techniques. The Ni-La/SiO₂ catalyst exhibited catalytic activity for the oxidative dehydrogenation of ethane, but with low ethylene selectivity in the absence of methane. The selectivity to ethylene increased with increasing molar ratio of methane in the feed. The carbon deposited on the catalyst surface in the sole ODHE with CO₂ was mainly inert carbon, while much more filamentous carbon was formed in the presence of methane. The filamentous carbon was easy to be removed by CO₂, which might play a role in improving the conversion of ethane to ethylene. The introduction of methane might affect the equilibrium of the CO₂ reforming of ethane and the ODHE with CO₂. As a consequence, the synthesis gas produced from CO₂ reforming of methane partly inhibited the reaction of ethane and promoted the ODHE with CO₂, thus increasing the selectivity of ethylene.

Key words: ethane, methane, CO₂, co-activation, Ni-La/SiO₂, ethylene selectivity

Xiaoxi Peng, Jianqiang Zhu, Lu Yao, Changwei Hu. Effect of methane co-feeding on the selectivity of ethylene produced from oxidative dehydrogenation of ethane with CO₂ over a Ni-La/SiO₂ catalyst[J]. 能源化学(英文), 2013, 22(4): 653-658.

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Effect of methane co-feeding on the selectivity of ethylene produced from oxidative dehydrogenation of ethane with CO₂ over a Ni-La/SiO₂ catalyst

Effect of methane co-feeding on the selectivity of ethylene produced from oxidative dehydrogenation of ethane with CO₂ over a Ni-La/SiO₂ catalyst

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