期刊
SURFACE SCIENCE
卷 604, 期 11-12, 页码 1002-1005出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.susc.2010.03.005
关键词
Supported gallium catalysts; Gallium XPS; Gallium surface sites; Gallium oxide reduction
In-situ XPS study of supported gallium oxide catalysts prepared by impregnation of different metal oxides supports (SiO(2), gamma-Al(2)O(3),TiO(2), and MgO) has been performed. It has been found that the formation of metallic gallium takes place upon high-temperature reduction of the catalysts in flowing hydrogen. Relative concentrations of metallic gallium were most high in the cases of alumina- and titania-supported catalysts. It was suggested that interaction of gallium oxide with a support surface favors the formation of metallic gallium upon high-temperature reduction. A possible mechanism of metallic gallium formation upon the reduction is discussed. (C) 2010 Elsevier B.V. All rights reserved.
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