Journal of Rare Earths ( IF 5.2 ) Pub Date : 2021-05-14 , DOI: 10.1016/j.jre.2021.04.016 Baohua Liu 1, 2 , Liang Yan 1 , Huahua Zhao 1 , Jian Yang 1 , Jun Zhao 1 , Huanling Song 1 , Lingjun Chou 1, 3
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 V5+ 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 MoO3 formation and stabilize the Mo5O14-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 C2H4 and CH3COOH is the highest (72%) at the ethane conversion of 31%. Therefore, MoVNbCeO multi-metal oxides are promising candidates for selective oxidation.
中文翻译:
铈掺杂剂在乙烷选择性氧化 MoVNbO 多金属氧化物催化剂中的作用
研究了Ce对MoVNbCeO多金属氧化物催化剂结构和乙烷选择性氧化性能的影响。这些具有优异氧化性的多金属氧化物催化剂表现出高催化活性,钒作为乙烷氧化反应的活性中心。提高的催化活性与催化剂表面上增加的 V 5+含量有关,这是由于 V 和 Ce 之间的电子转化增强所致。此外,Ce 有效地促进氧的吸附、活化和迁移。并且Ce的存在还可以防止MoO 3的形成并稳定Mo 5 O 14样的结构。此外,含有适量 Ce 的催化剂表现出优异的催化性能。特别是Ce/V比为0.1的MVN-Ce催化剂表现出最好的性能:催化剂对C 2 H 4和CH 3 COOH的总选择性最高(72%),乙烷转化率为31%。因此,MoVNbCeO 多金属氧化物是选择性氧化的有希望的候选者。