Sintering and redispersion of platinum catalysts supported on tin oxide

被引：45
作者：
Kamiuchi, Naoto [1 ]
Taguchi, Keiichi [1 ]
Matsui, Toshiaki [1 ]
Kikuchi, Ryuji [1 ]
Eguchi, Koichi [1 ]
机构：
[1] Kyoto Univ, Grad Sch Engn, Dept Energy & Hydrocarbon Chem, Nishikyo Ku, Kyoto 6158510, Japan
来源：
APPLIED CATALYSIS B-ENVIRONMENTAL | 2009年 / 89卷 / 1-2期
基金：
日本科学技术振兴机构;
关键词：
CO oxidation; Chemical interaction; Platinum; Tin oxide; Catalyst; Sintering; Dispersion; TEM; OXIDATION-REDUCTION TREATMENT; EXTRA-ATOMIC-RELAXATION; RE/GAMMA-AL2O3; CATALYST; CHEMICAL INTERACTION; REGENERATION; DISPERSION; BEHAVIOR; MODEL; HREM;
D O I：
10.1016/j.apcatb.2008.11.026
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：
CO oxidation activities of platinum/tin oxide catalysts prepared by impregnation have been investigated in relation with their nano-structural changes in various reduction-oxidation treatments. Variously treated Pt/SnO2 catalysts were characterized by XRD, XPS, and TEM. In 1 wt.% Pt/SnO2 catalyst calcined at 400 degrees C, crystallized fine particles of Pt were highly dispersed on SnO2 due to strong chemical interaction between two components. After the heat-treatment in a reducing atmosphere, the sintered Pt particles with grown size were frequently observed. Furthermore, unique texture of particles with core-shell structure was produced in the catalyst exposed in air after the reduction treatment at 400 degrees C. These large particles with the peculiar shape were re-dispersed by the reoxidation treatment at 400 degrees C to fine particle with similar size to the as-calcined catalysts. The reversibility of the microstructural changes between growth and redispersion of deposited particles was confirmed after the several reduction-oxidation cycles. It was revealed that the structural changes on the interface of Pt/SnO2 catalysts were closely related to the catalytic activity for CO oxidation. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码：65 / 72
页数：8
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