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学科主题物理化学
Reactivity of Ultra-Thin ZnO Films Supported by Ag(111) and Cu(111): A Comparison to ZnO/Pt(111)
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; H.-J.Freund
关键词Thin Oxide Films Zinc Oxide Inverse Catalysts Co Oxidation
刊名CATALYSIS LETTERS
2014-04-01
DOI10.1007/s10562-014-1191-y
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
关键词[WOS]METHANOL SYNTHESIS ; CO OXIDATION ; OXIDE NANOSTRUCTURES ; CU/ZNO CATALYSTS ; MODEL CATALYSTS ; SURFACE ; ADSORPTION ; GROWTH ; PT(111) ; METALS
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.
语种英语
WOS记录号WOS:000332866400015
引用统计
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/143970
专题中国科学院大连化学物理研究所
通讯作者H.-J.Freund
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
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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.
APA Pan, Q..,Liu, B. H..,McBriarty, M. E..,Martynova, Y..,Groot, I. M. N..,...&H.-J.Freund.(2014).Reactivity of Ultra-Thin ZnO Films Supported by Ag(111) and Cu(111): A Comparison to ZnO/Pt(111).CATALYSIS LETTERS,144(4),648-655.
MLA Pan, Q.,et al."Reactivity of Ultra-Thin ZnO Films Supported by Ag(111) and Cu(111): A Comparison to ZnO/Pt(111)".CATALYSIS LETTERS 144.4(2014):648-655.
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