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题名: Size-dependent surface reactions of Ag nanoparticles supported on highly oriented pyrolytic graphite
作者: Zhang, Hui1;  Fu, Qiang1;  Yao, Yunxi1;  Zhang, Zhen1;  Ma, Teng1;  Tan, Dali1;  Bao, Xinhe1
刊名: LANGMUIR
发表日期: 2008-10-07
DOI: 10.1021/la801348n
卷: 24, 期:19, 页:10874-10878
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Multidisciplinary ;  Chemistry, Physical ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Materials Science
英文摘要: Various sizes of Ag particles were grown on highly oriented pyrolytic graphite (HOPG) surfaces, which had previously been modified with nanopits to act as anchoring sites. Surface reactions of O-2, CHCl3, and CCl4 on the Ag particles and bulk Ag(111) surfaces were studied by X-ray photoelectron spectroscopy (XPS), and it has been shown that size dependence of O-2 and CHCl3 reactions on Ag differs from that of CCl4. Weak reactions of O-2 and CHCl3 were observed on the bulk Ag(111) surfaces, while strong reactions occur on Ag particles with medium Ag coverage, suggesting that the reactions are controlled by the number of surface defect sites. On the contrary, the dissociation of CCl4 is mainly determined by the exposed Ag facet area, mainly Ag(111) facet, and strong dissociation reaction happens on the bulk Ag(111) surface. The results suggest that the size effects, which are often discussed in heterogeneous catalysis, are strongly dependent on the reaction mechanism.
关键词[WOS]: CHARGE-TRANSFER PHOTODISSOCIATION ;  CATALYTICALLY ACTIVE GOLD ;  OXYGEN-ADSORPTION ;  EPOXIDE FORMATION ;  SILVER CATALYSTS ;  ETHYLENE-OXIDE ;  OXIDATION ;  CLUSTERS ;  AG(110) ;  XPS
语种: 英语
WOS记录号: WOS:000259673500055
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/141077
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, Peoples R China

Recommended Citation:
Zhang, Hui,Fu, Qiang,Yao, Yunxi,et al. Size-dependent surface reactions of Ag nanoparticles supported on highly oriented pyrolytic graphite[J]. LANGMUIR,2008,24(19):10874-10878.
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