Stabilization of catalytically active gold species in Fe-modified zeolites

被引：22

作者：

Bogdanchikova, N. ^{[1
]}

Simakov, A. ^{[1
]}

Smolentseva, E. ^{[1
]}

Pestryakov, A. ^{[2
]}

Farias, M. H. ^{[1
]}

Diaz, J. A. ^{[1
]}

Tompos, A. ^{[3
]}

Avalos, M. ^{[1
]}

机构：

[1] Tomsk Polytech Univ, Tomsk 634050, Russia

[2] Univ Nacl Autonoma Mexico, Ctr Ciencias Mat Condensada, Ensenada 22800, Baja California, Mexico

[3] Inst Chem, Chem Res Ctr, H-1025 Budapest, Hungary

来源：

APPLIED SURFACE SCIENCE | 2008年 / 254卷 / 13期

关键词：

gold; iron additive; zeolite; nanoparticles; impregnation; ion exchange;

D O I：

10.1016/j.apsusc.2007.12.060

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：

The influence of iron additive on redox, electronic and catalytic properties of gold incorporated into zeolite catalysts has been studied by means of TEM, XPS, XRD, TPR, ICP and AES. The interaction of gold with iron modifier was observed in Y-zeolites and mordenites with different cations and method of Fe incorporation (impregnation or ion exchange). This interaction leads to mutual influence on redox properties of Fe and Au ionic species and facilitates their reduction. Limited diffusion of Au precursor after Fe species deposition in narrow mordenite channels does not permit to incorporate Au in adequate concentration, while in large super-cage of Y-zeolites this limitation is absent. The structure of Y-zeolites favors formation of active gold species. Catalytic tests in CO oxidation show that Fe additive stabilizes the gold active species active at low-temperature (partly charged clusters) and makes them insensitive to redox treatments. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：4075 / 4083

页数：9

共 38 条

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