The effect of Ce on the structure of MoVNbCeO multi-metal oxide catalysts and the performance of ethane selective oxidation was investigated.These multi-metal oxide catalysts with superior oxidizability exhibit high c...The effect of Ce on the structure of MoVNbCeO multi-metal oxide catalysts and the performance of ethane selective oxidation was investigated.These multi-metal oxide catalysts with superior oxidizability exhibit high catalytic activity,and vanadium acts as the active center for ethane oxidation reaction.The improved catalytic activity is related to the increased V^(5+) content on the catalyst surface,which results from the enhanced transformation of the electrons between V and Ce.Moreover,Ce effectively promotes oxygen adsorption,activation,and mobility.And the presence of Ce can also prevent MoO_(3) formation and stabilize the Mo_(5)O_(14)-like structure.In addition,the catalyst with a moderate amount of Ce exhibits outstanding catalytic performance.Especially,the MVN-Ce catalyst with a Ce/V ratio of 0.1 exhibits the best performance:the total selectivity of the catalyst toward C_(2)H_(4) and CH_(3) COOH is the highest(72%) at the ethane conversion of 31%.Therefore,MoVNbCeO multi-metal oxides are promising candidates for selective oxidation.展开更多
基金Project supported by Petro China Innovation Foundation(2019D-5007-0404)the Youth Innovation Promotion Association of the Chinese Academy of Sciences(2017460)。
文摘The effect of Ce on the structure of MoVNbCeO multi-metal oxide catalysts and the performance of ethane selective oxidation was investigated.These multi-metal oxide catalysts with superior oxidizability exhibit high catalytic activity,and vanadium acts as the active center for ethane oxidation reaction.The improved catalytic activity is related to the increased V^(5+) content on the catalyst surface,which results from the enhanced transformation of the electrons between V and Ce.Moreover,Ce effectively promotes oxygen adsorption,activation,and mobility.And the presence of Ce can also prevent MoO_(3) formation and stabilize the Mo_(5)O_(14)-like structure.In addition,the catalyst with a moderate amount of Ce exhibits outstanding catalytic performance.Especially,the MVN-Ce catalyst with a Ce/V ratio of 0.1 exhibits the best performance:the total selectivity of the catalyst toward C_(2)H_(4) and CH_(3) COOH is the highest(72%) at the ethane conversion of 31%.Therefore,MoVNbCeO multi-metal oxides are promising candidates for selective oxidation.
