Co-existance of various active gold species in Au-mordenite catalyst for CO oxidation

被引：40

作者：

Tuzovskaya, I. V.

Simakov, A. V.

Pestryakov, A. N. ^{[1
]}

Bogdanchikova, N. E.

Gurin, V. V.

Farias, M. H.

Tiznado, H. J.

Avalos, M.

机构：

[1] Tomsk Polytechn Univ, Tomsk 634034, Russia

[2] Univ Nacl Autonoma Mexico, CCMC, Ensenada, Baja California, Mexico

[3] BSU, Inst Phys & Chem Res, Minsk 220080, BELARUS

[4] Univ Calif Riverside, Riverside, CA 92521 USA

来源：

CATALYSIS COMMUNICATIONS | 2007年 / 8卷 / 07期

关键词：

gold; zeolite; catalyst; active sites; oxidation;

D O I：

10.1016/j.catcom.2006.10.014

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：

Different structural and electronic states of gold species in H-mordenite with SiO2/Al2O3 molar ratio 206 and their transformations under redox treatments have been studied by the methods of diffuse reflectance UV-visible spectroscopy and FTIR spectroscopy of adsorbed CO. Different states of ionic and metallic gold were detected in the zeolite channels and on the external surface of the zeolite Au+ and Au3+ ions, charged clusters Au-n(delta+), and neutral nanoparticles Au-m. Catalytic tests of the samples revealed the co-existence of several types of active species of gold in CO oxidation - gold clusters <1.5 nm (responsible for low-temperature activity) and gold nanoparticles (responsible for high-temperature activity). (C) 2006 Elsevier B.V. All rights reserved.

引用

页码：977 / 980

页数：4

共 11 条

[1] Catalytically active Au on titania: yet another example of a strong metal support interaction (SMSI)? [J].