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《Chinese Journal of Catalysis》 2010-09
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Biphasic Synergistic Effects of Mg-V-O Catalysts in Oxidative Dehydrogenation of Cyclohexane

JIN Mei1,CHENG Zhenmin1,*,JIANG Xiaoxia1,GAO Yulan1,2,FANG Xiangchen2 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  
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 contamination layer of one phase on the surface of the catalyst.The biphasic synergistic effect on the conversion,yield,and selectivity was observed 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%.
【Fund】: 化学工程联合国家重点实验室资助课题(SKL-ChE-08C03)
【CateGory Index】: TQ203.2
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