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题名: Oxidation of amorphous Ni-Zr alloys studied by XPS, UPS, ISS and XRD
作者: Song, Z;  Bao, X;  Wild, U;  Muhler, M;  Ertl, G
关键词: amorphous ;  Ni-Zr alloy ;  oxidation ;  catalysis
刊名: APPLIED SURFACE SCIENCE
发表日期: 1998-09-01
卷: 134, 期:1-4, 页:31-38
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Materials Science, Coatings & Films ;  Physics, Applied ;  Physics, Condensed Matter
研究领域[WOS]: Chemistry ;  Materials Science ;  Physics
英文摘要: Amorphous Ni36Zr64 and Ni24Zr76 alloys were treated under conditions close to those used for activating Ni-Zr alloys in catalytic reactions. The composition and the structure of the surface region were investigated by X-ray photoelectron spectroscopy (XPS), ultraviolet photoelectron spectroscopy (UPS), ion scattering spectroscopy (ISS) and X-ray diffraction (XRD). The results show that exposing the amorphous alloys to 500 mbar O-2 at 523 K led to oxidized surfaces consisting of zirconia and different oxidic nickel species. On the oxidized Ni24Zr76 surface, only small amounts of NiO and Ni2O3 were found, while Ni2O3 was detected as the major Ni-containing species on the oxidized Ni36Zr64 surface. Oxidation of Ni in the alloys appeared to be inhibited by the presence of metallic Zr and started only after complete oxidation of the surrounding Zr. Annealing the oxidized alloys to 773 K led to a reduction of the surface oxides. The liberated oxygen atoms presumably diffused into the bulk, releasing metallic Ni. At the topmost layer, zirconia was reduced by carbon atoms originating from the bulk to form a ZrC-like surface compound. The exchange of Ni and Zr atoms between the surface and the bulk was enhanced by the oxidation and the annealing. The preferential oxidation of zirconium, which attracts Zr atoms from the bulk to the surface, provides the driving force for such processes. (C) 1998 Elsevier Science B.V. All rights reserved.
关键词[WOS]: CATALYTIC PROPERTIES ;  SURFACE OXIDATION ;  ZIRCONIUM ;  HYDROGENATION ;  ACTIVATION
语种: 英语
WOS记录号: WOS:000075851300004
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138197
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.Dalian Inst Chem Phys, Dalian 116023, Peoples R China
2.MPG, Fritz Haber Inst, D-14195 Berlin, Germany

Recommended Citation:
Song, Z,Bao, X,Wild, U,et al. Oxidation of amorphous Ni-Zr alloys studied by XPS, UPS, ISS and XRD[J]. APPLIED SURFACE SCIENCE,1998,134(1-4):31-38.
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