Supported gold catalysts prepared from a gold phosphine precursor and As-precipitated metal-hydroxide precursors: Effect of preparation conditions on the catalytic performance

被引:63
作者
Kozlov, AI
Kozlova, AP
Asakura, K
Matsui, Y
Kogure, T
Shido, T
Iwasawa, Y [1 ]
机构
[1] Univ Tokyo, Grad Sch Sci, Dept Chem, Bunkyo Ku, Tokyo 1130033, Japan
[2] Natl Inst Res Inorgan Mat, Tsukuba, Ibaraki 3050044, Japan
[3] Univ Tokyo, Grad Sch Sci, Inst Mineral, Bunkyo Ku, Tokyo 1130033, Japan
关键词
gold catalysts; preparation method; low-temperature CO oxidation; supported Au-phosphine complex; iron oxide; titanium oxide;
D O I
10.1006/jcat.2000.3033
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Supported gold catalysts highly active for low-temperature CO oxidation were prepared by using AuPPh3NO3 complex as a Au-metal precursor and wet as-precipitated iron hydroxide and titanium hydroxide as support precursors. Effects of catalyst preparation conditions on the performance for low-temperature CO oxidation were studied. Metal-hydroxide precipitation conditions and heating rates of temperature-programmed calcination altered significantly the performance of the supported gold catalysts. To elucidate key factors responsible for the effects the catalysts were characterized by EXAFS, TEM, XRD, and N-2 adsorption. Changes in the activities of both Au/Fe oxide and Au/Ti oxide catalysts originated mainly from changes of the Au particle size distribution. It was also found that states of the mesoporous support precursors upon attaching the An precursor onto them and during the temperature-programmed calcination appeared to be of great importance in obtaining dispersed Au nanoparticles on oxide surfaces. (C) 2000 Academic Press.
引用
收藏
页码:56 / 65
页数:10
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