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《Chinese Journal of Catalysis》 2003-10
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Oxidative Dehydrogenation of Ethane with Carbon Dioxide to Ethylene over Nanosized Cr_2O_3 Catalysts

DENG Shuang *, LI Huiquan, ZHANG Yi(Institute of Process Engineering, The Chinese Academy of Sciences, Beijing 100080, China)  
The nanosized Cr 2O 3 was prepared by sol gel coupling with azeotropic distillation method. The size distribution of the nanosized Cr 2O 3, statistically determined by TEM, was narrowly ranging from 20 to 40 nm. The nanosized composite catalysts Cr 2O 3/Al 2O 3, Cr 2O 3/ZrO 2 and Cr 2O 3/MgO were prepared by coprecipitation coupling with azeotropic distillation method. Calculated by using Scherrer equation, the average diameters of the nanosized composite catalysts were 8, 12 and 6 nm, respectively. The catalytic performance of these nanosized catalysts in oxidative dehydrogenation of ethane with carbon dioxide to ethylene was investigated. The result showed that the nanosized Cr 2O 3 catalyst exhibited much higher ethane conversion and lower ethylene selectivity than the normal Cr 2O 3 catalyst. The catalytic activity of the nanosized composite catalysts varied with the nature of the composites. Cr 2O 3/ZrO 2 catalyst showed the highest ethane conversion and the lowest ethylene selectivity among the nanosized composite catalysts. The ethylene yield over Cr 2O 3/Al 2O 3 catalyst was very low but it exhibited the highest ethylene selectivity. 10%Cr 2O 3/MgO catalyst exhibited excellent catalytic performance in the reaction, producing 61 54% ethane conversion and 94 79% ethylene selectivity at 973 K. These nanosized catalysts were characterized by BET, XRD, TEM, FT IR, XPS and TPR techniques. The reducibility of Cr and Cr 6+ /Cr 3+ ratio in the nanosized catalysts determined the catalytic performance in the oxidative dehydrogenation of ethane with carbon dioxide.
【Fund】: 国家 8 63计划资助项目 (2 0 0 1AA0 70 10 )
【CateGory Index】: O643.3
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