| Interaction of gas phase atomic hydrogen with Pt(111):Direct evidence for the formation of bulk hydrogen species |
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| 作者单位： | JIANG ZhiQuan（Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China） ;
HUANG WeiXin（Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China） ;
BAO XinHe（State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China） ; |
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| 基金项目： | 国家自然科学基金;中国科学院资助项目;中国博士后科学基金 |
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| 摘 要： | Employing hot tungsten filament to thermal dissociate molecular hydrogen,we generated gas phase atomic hydrogen under ultra-high vacuum(UHV)conditions and investigated its interaction with Pt(111) surface.Thermal desorption spectroscopy(TDS)results demonstrate that adsorption of molecular hy- drogen on Pt(111)forms surface Had species whereas adsorption of atomic hydrogen forms not only surface Had species but also bulk Had species.Bulk Had species is more thermal-unstable than surface Had species on Pt(111),suggesting that bulk Had species is more energetic.This kind of weakly- adsorbed bulk Had species might be the active hydrogen species in the Pt-catalyzed hydrogenation reactions.
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| 收稿时间： | 6 November 2005 |
| 修稿时间： | 23 March 2006 |
Interaction of gas phase atomic hydrogen with Pt(111): Direct evidence for the formation of bulk hydrogen species |
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| Authors: | Jiang ZhiQuan Huang WeiXin Bao XinHe |
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| Institution: | 1. Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
2. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China |
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| Abstract: | Employing hot tungsten filament to thermal dissociate molecular hydrogen,we generated gas phase atomic hydrogen under ultra-high vacuum(UHV)conditions and investigated its interaction with Pt(111) surface.Thermal desorption spectroscopy(TDS)results demonstrate that adsorption of molecular hy- drogen on Pt(111)forms surface Had species whereas adsorption of atomic hydrogen forms not only surface Had species but also bulk Had species.Bulk Had species is more thermal-unstable than surface Had species on Pt(111),suggesting that bulk Had species is more energetic.This kind of weakly- adsorbed bulk Had species might be the active hydrogen species in the Pt-catalyzed hydrogenation reactions. |
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| Keywords: | Pt(111) surface bulk H species thermal desorption spectroscopy |
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