Effect of preparation and metal content on the introduction of Fe in BEA zeolite, studied by DR UV-vis, EPR and Mossbauer spectroscopy

被引：41

作者：

Dzwlgaj, Stanislaw

Stievano, Lorenzo

Wagner, Friedrich E.

Che, Michel

机构：

[1] Univ Paris 06, CNRS, UMR 7609, Lab React Surface, F-75252 Paris 05, France

[2] Tech Univ Munich, Phys Dept E15, D-85747 Garching, Germany

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2007年 / 68卷 / 10期

关键词：

microporous materials; chemical synthesis; Mossbauer spectroscopy; electron paramagnetic resonance; microstructure;

D O I：

10.1016/j.jpcs.2007.05.016

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Fe-containing SiBEA zeolites were prepared by a two-step postsynthesis method: creation of vacant T-sites by dealumination of tetraethylammonium BEA zeolite with nitric acid and then impregnation of the resulting SiBEA zeolite with an aqueous solution of Fe(NO(3))(3). X-ray diffraction shows that iron is incorporated in SiBEA at lattice sites. The presence of Fe in its oxidation state + 3 and at isolated tetrahedral sites for low metal content, was demonstrated by diffuse reflectance UV-vis, EPR and Mossbauer spectroscopy. For high iron content, diffuse reflectance UV-vis and Mossbauer spectra revealed the additional presence of extra-lattice FeO(x) oligomers and superparamagnetic Fe-oxyhydroxide. Mossbauer spectroscopy identified superparamagnetic Fe-oxyhydroxide as the main phase when basic conditions are used for the preparation. (c) 2007 Elsevier Ltd. All rights reserved.

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页码：1885 / 1891

页数：7

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