Water-Activated Lattice Oxygen in FeO(111) Islands for Low-Temperature Oxidation of CO at Pt–FeO Interface

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• 作者：Yuekang Jin ; Guanghui Sun ; Feng Xiong ; Liangbing Ding ; Weixin Huang
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：May 12, 2016
• 年：2016
• 卷：120
• 期：18
• 页码：9845-9851
• 全文大小：393K
• 年卷期：0
• ISSN：1932-7455

文摘

The role of water in low-temperature oxidation of CO catalyzed at metal–oxide interfaces is of great interest. In this paper, we prepared Fe¹⁶O(111)/Pt(111) and Fe¹⁸O(111)/on Pt(111) inverse model catalysts with the same coverage of FeO(111) monolayer islands and comparatively studied C¹⁶O oxidation with ¹⁸O₂ or D₂¹⁸O on Fe¹⁶O(111)/Pt(111) inverse model catalyst and C¹⁶O oxidation with ¹⁶O₂ or D₂¹⁶O on Fe¹⁸O(111)/Pt(111) inverse model catalyst. Lattice oxygen in FeO does not participate into CO oxidation with O₂ but participates into CO oxidation with water via the mechanism of CO oxidation with hydroxyl groups formed by water dissociation at the FeO(111)–Pt interface. These results provide unambiguous experimental evidence for the unique role of water in activating surface lattice oxygen of oxides to oxidize CO at low temperatures, advancing the fundamental understandings of low-temperature CO oxidation involving hydroxyl groups catalyzed by metal–oxide interfaces.