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LEED-I(V) Structure Analysis of the (7 × √3)rect SO4 Phase on Ag(111): Precursor to the Active Species of the Ag-Catalyzed Ethylene Epoxidation
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2018-11-16 , DOI: 10.1021/acs.jpcc.8b09309
Regina Wyrwich 1 , Travis E. Jones 2 , Sebastian Günther 3 , Wolfgang Moritz 4 , Martin Ehrensperger 1 , Sebastian Böcklein 1 , Patrick Zeller 3 , Arne Lünser 1 , Andrea Locatelli 5 , Tevfik Onur Menteş 5 , Miguel Ángel Niño 5 , Axel Knop-Gericke 2 , Robert Schlögl 2 , Simone Piccinin 6 , Joost Wintterlin 1
Affiliation  

According to a recently proposed mechanism, the silver-catalyzed industrial synthesis of ethylene oxide (EO) involves adsorbed SO4. The O atoms that are added to the ethylene molecules to give EO originate from SO4, which may solve the long-standing question about the active oxygen species in this reaction. Here, we report a low-energy electron diffraction structure analysis of an ordered phase of SO4 on the Ag(111) surface, forming a (7 × √3)rect structure and containing the oxygen species that before had been spectroscopically identified on the active catalyst. Using I(V) data from a low-energy electron microscope and an input model from density functional theory, the complex structure could be solved. It contains SO4 moieties on a reconstructed Ag(111) surface in which all four O atoms bind to Ag atoms. In the proposed ethylene epoxide reaction model, the structure represents the parent phase from which the active SO4 phase is formed by a lifting of the reconstruction.

中文翻译:

在Ag(111)上(7×√3)rect SO 4相的LEED- IV)结构分析:Ag催化的乙烯环氧化活性物种的前体

根据最近提出的机理,环氧乙烷(EO)的银催化工业合成涉及吸附的SO 4。添加到乙烯分子中以生成EO的O原子源自SO 4,这可能解决了有关该反应中活性氧种类的长期存在的问题。在这里,我们报告了一种低能电子衍射结构分析,分析了Ag(111)表面上SO 4的有序相,形成了(7×√3)的正构结构,并包含了以前在光谱上鉴定出的氧种类。活性催化剂。使用IV)来自低能电子显微镜的数据以及来自密度泛函理论的输入模型,则可以解决复杂的结构。它在重建的Ag(111)表面上包含SO 4部分,其中所有四个O原子均与Ag原子结合。在提出的环氧乙烷反应模型中,该结构表示母体相,通过重建重构可从中形成活性SO 4相。
更新日期:2018-11-17
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