Investigation of the state of copper in supported copper-titanium oxide catalysts

被引：78

作者：

Komova, OV ^{[1
]}

Simakov, AV ^{[1
]}

Rogov, VA ^{[1
]}

Kochubei, DI ^{[1
]}

Odegova, GV ^{[1
]}

Kriventsov, VV ^{[1
]}

Paukshtis, EA ^{[1
]}

Ushakov, VA ^{[1
]}

Sazonova, NN ^{[1
]}

Nikoro, TA ^{[1
]}

机构：

[1] Boreskov Inst Catalysis, Novosibirsk 630090, Russia

来源：

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL | 2000年 / 161卷 / 1-2期

关键词：

copper states; titania; CH4; oxidation; SCR with ammonia;

D O I：

10.1016/S1381-1169(00)00342-3

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 copper-titanium oxide catalysts have been studied by IR spectroscopy, XRD, UV-VIS diffuse reflectance spectroscopy, ESR, TPR with hydrogen and EXAFS. Different states of Cu2+ ions have been found on the surface of TiO2. The ratio between these states depends on the copper concentration and catalyst preparation method. Chain structures are formed due to the interaction of Cu2+ ions with TiO2. Their concentration and geometry of their nearest oxygen environment are determined by the structure of anatase faces. Some of these surface-stabilized Cu2+ ions are nucleation centers of oxide clusters. A noticeable growth of bulk CuO phase is observed after the completion of the formation of chain structures and oxide clusters. A quantitative estimation of the concentration of these copper forms in the catalysts is reported. For supported copper-titanium oxide catalysts, chain forms of Cu2+ ions are shown to be the most active forms of copper in NO SCR with ammonia and methane oxidation. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：191 / 204

页数：14

共 34 条

[31] Adsorption, activation, and oxidation of ammonia over SCR catalysts [J].