催化学报

催化学报 ›› 2010, Vol. 31 ›› Issue (9): 1177-1184.DOI: 10.3724/SP.J.1088.2010.00204

• 研究论文 • 上一篇    下一篇

Mg-V-O 催化剂在环己烷氧化脱氢反应中的双晶相间协同效应

晋梅1, 程振民1, 江晓霞1, 高玉兰1,2, 方向晨2   

  1. 1华东理工大学化学工程国家重点实验室, 上海 200237 2中国石油化工股份有限公司抚顺石油化工研究院, 辽宁抚顺 113001
  • 收稿日期:2010-09-30 出版日期:2010-09-30 发布日期:2014-01-25

Biphasic Synergistic Effects of Mg-V-O Catalysts in Oxidative Dehydrogenation of Cyclohexane

JIN Mei1, CHENG Zhenmin1,*, JIANG Xiaoxia1, GAO Yulan1,2, FANG Xiangchen2   

  1. 1State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China 2Fushun Research Institute of Petroleum and Petrochemicals, SINOPEC, Fushun 113001, Liaoning, China
  • Received:2010-09-30 Online:2010-09-30 Published:2014-01-25

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被引次数

4

摘要： 在机械混合的 MgO-Mg3(VO4)2, Mg3(VO4)2-Mg2V2O7 和 V2O5-MgV2O6 双晶相催化剂体系上, 研究了晶相间协同催化效应对环己烷氧化脱氢反应性能的影响. 催化剂表征和反应结果表明, 双晶相间协同效应或源于不同晶相间形成的内聚界面, 或遵从溢流氧的遥控机理, 或产生于其中一个晶相完全包覆整个催化剂表面. 当在 Mg3(VO4)2 上进行环己烷氧化脱氢反应时, 可加入适量 MgO 或 Mg2V2O7 以提高其催化性能. 在 80%Mg3(VO4)2-20%Mg2V2O7 催化剂上, 当环己烷转化率为 15.5% 时, 环己烯选择性达 44.9%.

关键词: 镁, 钒, 复合氧化物, 环己烷, 氧化脱氢, 环己烯

Abstract: The biphasic synergistic effect of a mechanically mixed Mg-V-O catalyst system, which included MgO-Mg3(VO4)2, Mg3(VO4)2- Mg2V2O7, and V2O5-MgV2O6 catalysts, in the oxidative dehydrogenation of cyclohexane was studied. Characterization results and catalytic performance measurements reveal that the biphasic synergistic effect derives from three mechanisms: the formation of coherent interface of the two phases, the remote control mechanism originated from the spillover of mobile surface oxygen, and the formation of a surface con-tamination layer of one phase on the surface of the catalyst. The biphasic synergistic effect on the conversion, yield, and selectivity was ob-served in Mg3(VO4)2 mixing with a suitable amount of MgO and Mg2V2O7. Among the catalyst system, the 80%Mg3(VO4)2- 20%Mg2V2O7 catalyst exhibits better catalytic performance and shows cyclohexene selectivity of 44.9% with cyclohexane conversion of 15.5%.

Key words: magnesium, vanadium, complex oxide, cyclohexane, oxidative dehydrogenation, cyclohexene