X-ray absorption fine structure analysis of the local environment of Fe in Fe/Al-MFI

被引：38

作者：

Choi, SH

Wood, BR

Bell, AT ^{[1
]}

Janicke, MT

Ott, KC

机构：

[1] Univ Calif Berkeley, Dept Chem Engn, Berkeley, CA 94720 USA

[2] Los Alamos Natl Lab, Div Chem, Los Alamos, NM 87545 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2004年 / 108卷 / 26期

关键词：

D O I：

10.1021/jp040065e

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：

An MFI zeolite framework containing iron and aluminum has been prepared and characterized by X-ray absorption spectroscopy. Extended X-ray absorption fine structure analysis indicates that in the as-prepared zeolite Fe is present in the framework but migrates to extraframework sites upon thermal activation at elevated temperature. In the absence of framework Al, Fe forms small particles of Fe3O4. When Al is included in the zeolite, extraframework Fe associates with framework Al in a manner identical to that observed in Fe-exchanged H-ZSM-5. Therefore, the presence of framework Al in the MFI structure plays a critical role in stabilizing atomically dispersed Fe.

引用

收藏

页码：8970 / 8975

页数：6

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