Promoting effect of carbon dioxide on the dehydrogenation of ethylbenzene over silica-supported vanadium catalysts

被引：30
作者：
Chen, Shuwei [1 ,2 ]
Qin, Zhangfeng [2 ]
Wang, Guofu [2 ]
Dong, Mei [2 ]
Wang, Jianguo [2 ]
机构：
[1] Taiyuan Univ Technol, Coll Chem & Chem Engn, Taiyuan 030024, Shanxi, Peoples R China
[2] Chinese Acad Sci, Inst Coal Chem, State Key Lab Coal Convers, POB 165, Taiyuan 030001, Shanxi, Peoples R China
来源：
FUEL | 2013年 / 109卷
关键词：
Ethylbenzene dehydrogenation; Carbon dioxide; VOx/SiO2; Promoting effect; Catalyst deactivation; OXIDATIVE DEHYDROGENATION; OXIDE CATALYSTS; SOFT OXIDANT; STYRENE; CO2; CONVERSION; ALKANES; ETHANE; FE;
D O I：
10.1016/j.fuel.2012.06.004
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
Dehydrogenation of ethylbenzene (EB) to styrene (ST) in the presence of carbon dioxide (CO2) was carried out over silica-supported vanadium catalysts (VOx/SiO2) to investigate the role of CO2 played in this reaction coupling process. A prominent promoting effect of CO2 on EB dehydrogenation is observed; over VOx/SiO2 with a vanadium loading of 0.8 mmol/g-SiO2, ST yield at 550 degrees C in CO2 is 2.05 times higher than that in an inert atmosphere of nitrogen and the catalyst also deactivates much more slowly in CO2. CO2 as a soft oxidant can effectively keep/regain high valence vanadium species that are highly active for EB dehydrogenation, which is then conducive to enhancing EB conversion and suppressing catalyst deactivation. Both carbonaceous deposition and deep reduction of the active vanadium species contribute to the catalyst deactivation; however, CO2 is only effective on alleviating the catalyst deactivation by protecting the high valance vanadium species from deep reduction, but is invalid in suppressing coke formation. (C) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码：43 / 48
页数：6
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