催化学报 ›› 2010, Vol. 31 ›› Issue (8): 993-998.DOI: 10.1016/S1872-2067(10)60099-X

• 研究论文 • 上一篇    下一篇

CO2 气氛下 MCF 负载氧化钒催化剂上乙苯脱氢反应

李春光 1, 缪长喜2, 聂颖颖 1, 乐英红 1, 顾松园 2, 杨为民 2, 华伟明 1, 高滋 1   

  1. 1 复旦大学化学系, 上海市分子催化和功能材料重点实验室, 上海 200433 2 中国石油化工股份有限公司上海石油化工研究院, 上海 201208
  • 收稿日期:2010-04-26 出版日期:2010-08-30 发布日期:2013-12-26
  • 通讯作者: 华伟明

Ethylbenzene Dehydrogenation in the Presence of CO2 over MCF-Supported Vanadium Oxide Catalysts

LI Chunguang1, MIAO Changxi2, NIE Yingying1, YUE Yinghong1, GU Songyuan2, YANG Weimin2, HUA Weiming1,*, GAO Zi1,#   

  1. 1Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, Shanghai 200433, China 2Shanghai Research Institute of Petrochemical Technology, SINOPEC, Shanghai 201208, China
  • Received:2010-04-26 Online:2010-08-30 Published:2013-12-26

摘要: 以介孔氧化硅泡沫 MCF 为载体合成了一系列负载型氧化钒催化剂 (V 含量为 2%?10%). 采用 N2 吸附、X 射线衍射和 H2 程序升温还原对 V/MCF 催化剂的结构和织构性质进行了表征, 并评价了催化剂在 CO2 气氛下的乙苯脱氢性能. V/MCF 催化剂具有较高的乙苯脱氢活性, 其中 V 含量为 6% 的催化剂具有最高的反应活性. V/MCF 催化剂的乙苯脱氢活性显著高于 V/MCM-41, 这是由于前者具有较高的可还原性以及较好的扩散性能. CO2 气氛下的乙苯转化率明显高于 N2 气氛下的, 这归因于 CO2 与乙苯发生氧化脱氢, 并通过逆水煤气变换反应在线除去脱氢反应生成的氢.

关键词: 氧化钒, 介孔氧化硅泡沫, 负载型催化剂, 乙苯脱氢, 苯乙烯, 二氧化碳

Abstract: A series of vanadia catalysts supported on mesocellular silica foam (MCF) with a V content ranging from 2% to 10% were studied with respect to their performance in the dehydrogenation of ethylbenzene (EB) to styrene in the presence of CO2. The structural and textural characterization of these catalysts was done using N2 adsorption, X-ray diffraction, and temperature-programmed reduction. These catalysts were found to be effective for the dehydrogenation reaction and the 6%V/MCF catalyst showed the highest activity. The MCF-supported vanadia catalysts exhibited far higher activity than their conventional V/MCM-41 counterparts, which can be attributed to the higher reduci-bility and better diffusion of reactants and products in the former catalysts. A higher conversion was obtained during EB dehydrogenation with CO2 than with N2. This is due to the oxidative dehydrogenation of EB with the help of oxygen that originates from CO2 as well as the coupling of EB simple dehydrogenation with the reverse water-gas shift reaction.

Key words: vanadia, mesocellular silica foam, supported catalyst, ethylbenzene dehydrogenation, styrene, carbon dioxide

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