Catalytic Behavior for Oxidative Dehydrogenation of Ethane over Doped MTiO3 Catalysts

Abstract

Abstract: The catalytic behavior of the various doped-MTiO₃(M=Ca,Sr) catalysts for the oxidative dehydrogenation of ethane(ODHE) was examined in the temperature range of 700 ～850℃.All of the catalysts have certainly shown a catalytic activity for ODHE.When Li+substituted Ti⁴⁺ in CaTiO₃,a much better improvement in the C₂H₄ selectivity was observed.Selectivity 71.7% for C₂H₄,and conversion 87.8% for C₂H₆ could be obtained over the catalyst,CaTi_0.9Li_0.1O_3-δ at 850℃.The substitution of Sr for Ca in Ca_1-xSr_xTi_0.9Li_0.1O_3-δ could give a high selecitivity(≥90%) for C₂H₄ in a very widely temperature range(700～850℃).The effect of Li⁺ doping was explained by the increment of oxygen vacancy and the formation of non-fully reduced oxygen species.The non-fully reduced oxygen species are suggested as the active sites responsible for ethylene selecivity,and the reaction between reactants and catalyst is inhibited by CO₂.

Key words: Ethane, Oxidative dehydrogenation, Mixed oxide of the doped perovskite

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CHEN Tong, LI Wen-Zhao, YU Chun-Ying, JI Ya-Ying, YU Zuo-Long. Catalytic Behavior for Oxidative Dehydrogenation of Ethane over Doped MTiO₃ Catalysts[J]. Chem. J. Chinese Universities, 1996, 17(10): 1617.

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Catalytic Behavior for Oxidative Dehydrogenation of Ethane over Doped MTiO₃ Catalysts

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