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首页> 外文期刊>Journal of structural chemistry >Re- AND Cs-COPROMOTED SILVER CATALYSTS FOR ETHYLENE EPOXIDATION: A THEORETICAL STUDY
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Re- AND Cs-COPROMOTED SILVER CATALYSTS FOR ETHYLENE EPOXIDATION: A THEORETICAL STUDY

机译:用于乙烯环氧化的Re-和Cs-CoproMoted银催化剂:理论研究

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摘要

The effect of Re- and Cs-copromotion of Ag catalysts for ethylene epoxidation is studied computationally using density functional theory approach. The models reflecting Re involvement in the form of oxyanion and as a component of Ag-Re alloys are considered. The synergistic effect of Cs and Re is caused by the formation of the CsReOx species, with Cs stabilizing the Re oxyanion to promote ethylene epoxidation over the Ag catalysts. The role of Re is proposed to be related to altering the electron density distribution, compensating oxygen vacancies, covering non-selective sites, and providing the optimal retention time for initial compounds, products, and oxametallacycles on the catalyst surface.
机译:使用密度泛函理论方法计算重新和Cs-催化剂对乙烯环氧化的催化剂对乙烯环氧化的影响。 考虑了反映氧气形式和作为Ag-Re合金的组分的反映的模型。 Cs和Re的协同作用是由CSREOX物种形成引起的,CS稳定RE氧气以促进Ag催化剂上的乙烯环氧化。 Re的作用被提出与改变电子密度分布,补偿氧空位,覆盖非选择性位点,并为催化剂表面上的初始化合物,产物和氧酰胺的最佳保留时间提供最佳的保留时间。

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