title: Engineering catalytic contacts and thermal stability: gold/iron oxide binary nanocrystal superlattices for CO oxidation.
abstract: 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.
authors.affiliation: Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
authors.forename: Yijin
authors.initials: Y
authors.lastname: Kang
authors.forename: Xingchen
authors.initials: X
authors.lastname: Ye
authors.forename: Jun
authors.initials: J
authors.lastname: Chen
authors.forename: Liang
authors.initials: L
authors.lastname: Qi
authors.forename: Rosa E
authors.initials: RE
authors.lastname: Diaz
authors.forename: Vicky
authors.initials: V
authors.lastname: Doan-Nguyen
authors.forename: Guozhong
authors.initials: G
authors.lastname: Xing
authors.forename: Cherie R
authors.initials: CR
authors.lastname: Kagan
authors.forename: Ju
authors.initials: J
authors.lastname: Li
authors.forename: Raymond J
authors.initials: RJ
authors.lastname: Gorte
authors.forename: Eric A
authors.initials: EA
authors.lastname: Stach
authors.forename: Christopher B
authors.initials: CB
authors.lastname: Murray
mesh_terms: D002248:Carbon Monoxide / Q000737:chemistry*; D002384:Catalysis; D005290:Ferric Compounds / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry*; D010084:Oxidation-Reduction; D010316:Particle Size; D013499:Surface Properties; D013696:Temperature
chemical_list: D005290:Ferric Compounds; C000499:ferric oxide; D006046:Gold; D002248:Carbon Monoxide