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

机译：二氧化硅对二氧化硅负载的钒催化剂上乙苯脱氢的促进作用

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摘要

Dehydrogenation of ethylbenzene (EB) to styrene (ST) in the presence of carbon dioxide (CO_2) was carried out over silica-supported vanadium catalysts (VO_x/SiO_2) to investigate the role of CO_2 played in this reaction coupling process. A prominent promoting effect of CO_2 on EB dehydrogenation is observed; over VO_x/ SiO_2 with a vanadium loading of 0.8 mmol/g-SiO_2, ST yield at 550℃ in CO_2 is 2.05 times higher than that in an inert atmosphere of nitrogen and the catalyst also deactivates much more slowly in CO_2. CO_2 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, CO_2 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.
机译：在二氧化硅负载的钒催化剂（VO_x / SiO_2）上，在二氧化碳（CO_2）存在下将乙苯（EB）脱氢为苯乙烯（ST），以研究CO_2在该反应偶联过程中的作用。观察到CO_2对EB脱氢有显着的促进作用；在钒载量为0.8 mmol / g-SiO_2的VO_x / SiO_2上，CO_2在550℃下的ST收率是惰性氮气气氛中的2.05倍，并且催化剂在CO_2中的失活也要慢得多。 CO_2作为一种软氧化剂，可以有效地保持/恢复对EB脱氢具有高活性的高价态钒，从而有利于增强EB转化率并抑制催化剂失活。碳的沉积和活性钒物质的深度还原都有助于催化剂的失活。然而，CO 2仅通过保护高价钒物种不被深度还原而有效地减轻了催化剂的失活，但是在抑制焦炭形成方面是无效的。

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  • 来源
    《Fuel》 |2013年第7期|43-48|共6页
  • 作者

    Shuwei Chen; Zhangfeng Qin; Guofu Wang; Mei Dong; Jianguo Wang;

  • 作者单位

    College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Yingze West Street 79#, Taiyuan, Shanxi 030024, PR China,State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, P.O. Box 165, Taiyuan, Shanxi 030001, PR China;

    State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, P.O. Box 165, Taiyuan, Shanxi 030001, PR China;

    State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, P.O. Box 165, Taiyuan, Shanxi 030001, PR China;

    State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, P.O. Box 165, Taiyuan, Shanxi 030001, PR China;

    State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, P.O. Box 165, Taiyuan, Shanxi 030001, PR China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Ethylbenzene dehydrogenation; Carbon dioxide; VO_x/SiO_2; Promoting effect; Catalyst deactivation;

    机译：乙苯脱氢;二氧化碳;VO_x / SiO_2;促进作用;催化剂失活;

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