Water-Mediated Mars–Van Krevelen Mechanism for CO Oxidation on Ceria-Supported Single-Atom Pt1 Catalyst

详细信息    查看全文

• 作者：Chunlei Wang ; Xiang-Kui Gu ; Huan Yan ; Yue Lin ; Junjie Li ; Dandan Liu ; Wei-Xue LiJunling Lu
• 刊名：ACS Catalysis
• 出版年：2017
• 出版时间：January 6, 2017
• 年：2017
• 卷：7
• 期：1
• 页码：887-891
• 全文大小：414K
• ISSN：2155-5435

文摘

In water-promoted CO oxidation, water was thought not to directly participate in CO₂ production. Here we report that via a water-mediated Mars–van Krevelen (MvK) mechanism, water can directly contribute to about 50% of CO₂ production on a single-atom Pt₁/CeO₂ catalyst. The origin is the facile reaction of CO with the hydroxyl from dissociated water to yield the carboxyl intermediate, which dehydrogenates subsequently with the help of a lattice hydroxyl to generate CO₂ and water. The water-mediated MvK type reaction found here provides new insights in the promotion role of water in heterogeneous catalysis.