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Active Phase of FeOx/Pt Catalysts in Low-Temperature CO Oxidation and Preferential Oxidation of CO Reaction
Chen, Hao1,2; Liu, Yun1,2; Yang, Fan1; Wei, Mingming1,2; Zhao, Xinfie1,2; Ning, Yanxiao1; Liu, Qingfei1,2; Zhang, Yi1,2; Fu, Qiang1; Bao, Xinhe1
刊名JOURNAL OF PHYSICAL CHEMISTRY C
2017-05-18
DOI10.1021/acs.jpcc.7b01392
121页:10398-10405
收录类别SCI
文章类型Article
WOS标题词Science & Technology ; Physical Sciences ; Technology
类目[WOS]Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary
研究领域[WOS]Chemistry ; Science & Technology - Other Topics ; Materials Science
关键词[WOS]SCANNING-TUNNELING-MICROSCOPY ; FERROUS CENTERS ; PT(111) SURFACE ; OXIDE-FILMS ; OXYGEN ; INTERFACE ; COVERAGE ; NANOSTRUCTURES ; VACUUM ; SITES
英文摘要The interface between metal and reducible oxide has attracted increasing interest in catalysis. The FeOx Pt interface has been a typical example, which showed remarkable activity for the preferential oxidation of CO (PROX) at low temperatures. However, model catalytic studies under vacuum conditions or in high-pressure O-rich environment at 450 K have reported two different active phases with iron in two different valence states, invoking a possible pressure gap. To identify the active phase for low-temperature CO oxidation and PROX, it is necessary to investigate the stability and activity of FeO/Pt(111) under the realistic reaction conditions. We thus conducted an in situ study on FeO/Pt(111) from ultrahigh vacuum to the atmospheric pressure of reactant gases. Our study shows FeO islands were easily, oxidized in 1 Torr O-2 to form the trilayer FeO2 islands. However, the presence of 2 Torr CO could prevent the oxidation of FeO islands and lead to CO oxidation at the FeO/Pt(111) interface. The FeO/Pt(111) surface exhibits an excellent activity for CO, production with an initial reaction rate measured to be similar to X 10(14) molecules-cm(-2)-s(-1) at 300 K. FeO islands supported on Pt(111) were further investigated in the PROX gas, i.e., the mixture of 98.5% H-2, 1% CO, and 0.5% O-2 at elevated pressures up to 1 bar. Our results thus bridged the pressure gap and identified the bilayer FeO islands on Pt(111) as the active phase for PROX under the realistic reaction conditions.
语种英语
WOS记录号WOS:000402024200017
引用统计
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/152192
专题中国科学院大连化学物理研究所
作者单位1.Chinese Acad Sci, Dalian Inst Chem Phys, Collaborat Innovat Ctr Chem Energy Mat, State Key Lab Catalysis,CAS Ctr Excellence Nanosc, Zhongshan Rd 457, Dalian 116023, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
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GB/T 7714
Chen, Hao,Liu, Yun,Yang, Fan,et al. Active Phase of FeOx/Pt Catalysts in Low-Temperature CO Oxidation and Preferential Oxidation of CO Reaction[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2017,121:10398-10405.
APA Chen, Hao.,Liu, Yun.,Yang, Fan.,Wei, Mingming.,Zhao, Xinfie.,...&Bao, Xinhe.(2017).Active Phase of FeOx/Pt Catalysts in Low-Temperature CO Oxidation and Preferential Oxidation of CO Reaction.JOURNAL OF PHYSICAL CHEMISTRY C,121,10398-10405.
MLA Chen, Hao,et al."Active Phase of FeOx/Pt Catalysts in Low-Temperature CO Oxidation and Preferential Oxidation of CO Reaction".JOURNAL OF PHYSICAL CHEMISTRY C 121(2017):10398-10405.
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