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题名: Active Phase of FeOx/Pt Catalysts in Low-Temperature CO Oxidation and Preferential Oxidation of CO Reaction
作者: 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
发表日期: 2017-05-18
DOI: 10.1021/acs.jpcc.7b01392
卷: 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
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.
关键词[WOS]: SCANNING-TUNNELING-MICROSCOPY ;  FERROUS CENTERS ;  PT(111) SURFACE ;  OXIDE-FILMS ;  OXYGEN ;  INTERFACE ;  COVERAGE ;  NANOSTRUCTURES ;  VACUUM ;  SITES
语种: 英语
WOS记录号: WOS:000402024200017
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/152192
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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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

Recommended Citation:
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.
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