Comparative studies of leached Pt-Fe and Pt-Co catalysts for CO oxidation reactions

被引：20
作者：
Xu, Hong [1 ]
Ni, Ke [1 ]
Li, Xiaokun [1 ]
Zhu, Sheng [1 ]
Fan, Guohong [1 ]
机构：
[1] Anhui Univ Technol, Sch Chem & Chem Engn, Maanshan 243002, Anhui, Peoples R China
来源：
CHINESE JOURNAL OF CATALYSIS | 2017年 / 38卷 / 07期
基金：
中国国家自然科学基金;
关键词：
Pt-Fe; Pt-Co; Acid leaching; CO oxidation; Surface oxide; INVERSE OXIDE/METAL CATALYSTS; IN-SITU; PREFERENTIAL OXIDATION; BIMETALLIC CATALYSTS; ELECTRONIC-STRUCTURE; CARBON-MONOXIDE; OXIDE-FILMS; SURFACE; INTERFACE; NANOPARTICLES;
D O I：
10.1016/S1872-2067(17)62838-9
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
Leached Pt-Fe and Pt-Co catalysts were prepared by acid leaching the reduced catalysts in acid Received 10 April 2017 solution. Oxidation treatments of leached catalysts produced the structure of metal oxides decoratAccepted 12 April 2017 ing the surface of nanoparticles. The fully oxidized Fe2O3 and Co3O4 species on Pt nanoparticle surPublished 5 July 2017 faces result in the low performance of the CO complete oxidation (COOX) reaction. In contrast, unsaturated Fe0 and Co0 surface species can be formed during exposure to the CO preferential oxidation (CO-PROX) reaction with an excess of H-2, leading to a high O-2 activation ability and enhancing the CO-PROX activity. The FeOx surface structures can be transformed between these two states by varying the reactive gas environments, exhibiting oscillating activity in these two reactions. Conversely, the Co0 surface structure formed in the Hz-rich atmosphere is stable when exposed to the COOX reaction and exhibits similar activity in these two reactions. It is hoped that this work may assist in understanding the important role of surface oxides in real reactions. (C) 2017, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
引用
收藏
页码：1261 / 1269
页数：9
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