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题名: Identification of relevant active sites and a mechanism study for reverse water gas shift reaction over Pt/CeO2 catalysts
作者: Chen, Xiaodong1, 2;  Su, Xiong1;  Liang, Binglian1, 2;  Yang, Xiaoli1, 2;  Ren, Xinyi1;  Duan, Hongmin1;  Huang, Yanqiang1;  Zhang, Tao1
关键词: RWGS reaction ;  Pt/CeO2 catalyst ;  Formate intermediate ;  Mechanism
刊名: JOURNAL OF ENERGY CHEMISTRY
发表日期: 2016-11-01
DOI: 10.1016/j.jechem.2016.11.011
卷: 25, 期:6, 页:1051-1057
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Applied ;  Chemistry, Physical ;  Energy & Fuels ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Energy & Fuels ;  Engineering
英文摘要: Reverse water gas shift (RWGS) reaction can serve as a pivotal stage in the CO2 conversion processes, which is vital for the utilization of CO2. In this study, RWGS reaction was performed over Pt/CeO2 catalysts at the temperature range of 200-500 degrees C under ambient pressure. Compared with pure CeO2, Pt/CeO2 catalysts exhibited superior RWGS activity at lower reaction temperature. Meanwhile, the calculated TOF and E-a values are approximately the same over these Pt/CeO2 catalysts pretreated under various calcination conditions, indicating that the RWGS reaction is not affected by the morphologies of anchored Pt nanoparticles or the primary crystallinity of CeO2. TPR and XPS results indicated that the incorporation of Pt promoted the reducibility of CeO2 support and remarkably increased the content of Ce 3 + sites on the catalyst surface. Furthermore, the CO TPSR-MS signal under the condition of pure CO2 flow over Pt/CeO 2 catalyst is far lower than that under the condition of adsorbed CO2 with H-2 -assisted flow, revealing that CO2 molecules adsorbed on Ce3+ active sites have difficult in generating CO directly. Meanwhile, the adsorbed CO2 with the assistance of H-2 can form formate species easily over Ce3+ active sites and then decompose into Ce3+-CO species for CO production, which was identified by in-situ FTIR. (C) 2016 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B. V. and Science Press. All rights reserved.
关键词[WOS]: CO2 REDUCTION ;  PT/TIO2 CATALYSTS ;  CARBON-DIOXIDE ;  LIGHT OLEFINS ;  HYDROGENATION ;  DRIFTS ;  NANOPARTICLES ;  REDUCIBILITY ;  CONVERSION ;  FORMATES
语种: 英语
WOS记录号: WOS:000390132200019
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/150507
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, State Key Lab Catalysis, Dalian 116023, Liaoning, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

Recommended Citation:
Chen, Xiaodong,Su, Xiong,Liang, Binglian,et al. Identification of relevant active sites and a mechanism study for reverse water gas shift reaction over Pt/CeO2 catalysts[J]. JOURNAL OF ENERGY CHEMISTRY,2016,25(6):1051-1057.
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