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学科主题: 物理化学
题名: Reactivity of Ultra-Thin ZnO Films Supported by Ag(111) and Cu(111): A Comparison to ZnO/Pt(111)
作者: Pan, Q.1, 2;  Liu, B. H.1;  McBriarty, M. E.1, 3;  Martynova, Y.1;  Groot, I. M. N.1;  Wang, S.2;  Bedzyk, M. J.3;  Shaikhutdinov, S.1;  Freund, H. -J.1
通讯作者: H.-J.Freund
关键词: Thin oxide films ;  Zinc oxide ;  Inverse catalysts ;  CO oxidation
刊名: CATALYSIS LETTERS
发表日期: 2014-04-01
DOI: 10.1007/s10562-014-1191-y
卷: 144, 期:4, 页:648-655
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: We studied structure and reactivity of ZnO(0001) ultrathin films grown on Ag(111) and Cu(111) single crystal surfaces. Structural characterization was carried out by scanning tunneling microscopy, Auger electron spectroscopy, low-energy electron diffraction, and temperature programmed desorption. The CO oxidation behavior of the films was studied at low temperature (450 K) at near atmospheric pressures using gas chromatography. For ZnO/Cu(111), it is shown that under reaction conditions ZnO readily migrates into the Cu crystal bulk, and the reactivity is governed by a CuOx oxide film formed in the reaction ambient. In contrast, the planar structure of ZnO films on Ag(111) is maintained, similarly to the previously studied ZnO films on Pt(111). At sub-monolayer coverages, the "inverse'' model catalysts are represented by two-monolayer-thick ZnO(0001) islands on Pt(111) and Ag(111) supports. While the CO oxidation rate is considerably increased on ZnO/Pt(111), which is attributed to active sites at the metal/oxide boundary, sub-monolayer ZnO films on Ag(111) did not show such an effect, and the reactivity was inhibited with increasing film coverage. The results are explained by much stronger adsorption of CO on Pt(111) as compared with Ag(111) in proximity to O species at the oxide/metal boundary. In addition, the water-gas shift and reverse water-gas shift reactions were examined on ZnO/Ag(111), which revealed no promotional effect of ZnO on the reactivity of Ag under the conditions studied. The latter finding suggests that wetting phenomena of ZnO on metals does not play a crucial role in the catalytic performance of ZnO-based real catalysts in those reactions.
关键词[WOS]: METHANOL SYNTHESIS ;  CO OXIDATION ;  OXIDE NANOSTRUCTURES ;  CU/ZNO CATALYSTS ;  MODEL CATALYSTS ;  SURFACE ;  ADSORPTION ;  GROWTH ;  PT(111) ;  METALS
语种: 英语
WOS记录号: WOS:000332866400015
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/143970
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.Fritz Haber Inst, Dept Chem Phys, D-14195 Berlin, Germany
2.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, Dalian 116023, Liaoning, Peoples R China
3.Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA

Recommended Citation:
Pan, Q.,Liu, B. H.,McBriarty, M. E.,et al. Reactivity of Ultra-Thin ZnO Films Supported by Ag(111) and Cu(111): A Comparison to ZnO/Pt(111)[J]. CATALYSIS LETTERS,2014,144(4):648-655.
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