Engineering Catalytic Contacts and Thermal Stability: Gold/Iron Oxide Binary Nanocrystal Superlattices for CO Oxidation

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• 作者：Yijin Kang ; Xingchen Ye ; Jun Chen ; Liang Qi ; Rosa E. Diaz ; Vicky Doan-Nguyen ; Guozhong Xing ; Cherie R. Kagan ; Ju Li ; Raymond J. Gorte ; Eric A. Stach ; Christopher B. Murray
• 刊名：The Journal of the American Chemical Society
• 出版年：2013
• 出版时间：January 30, 2013
• 年：2013
• 卷：135
• 期：4
• 页码：1499-1505
• 全文大小：497K
• 年卷期：v.135,no.4(January 30, 2013)
• ISSN：1520-5126

文摘

Well-defined surface, such as surface of a single crystal, is being used to provide precise interpretation of catalytic processes, while the nanoparticulate model catalyst more closely represents the real catalysts that are used in industrial processes. Nanocrystal superlattice, which combines the chemical and physical properties of different materials in a single crystalline structure, is an ideal model catalyst, that bridge between conventional models and real catalysts. We identify the active sites for carbon monoxide (CO) oxidation on Au-FeO_x catalysts by using Au-FeO_x binary superlattices correlating the activity to the number density of catalytic contacts between Au and FeO_x. Moreover, using nanocrystal superlattices, we propose a general strategy of keeping active metals spatially confined to enhance the stability of metal catalysts. With a great range of nanocrystal superlattice structures and compositions, we establish that nanocrystal superlattices are useful model materials through which to explore, understand, and improve catalytic processes bridging the gap between traditional single crystal and supported catalyst studies.