扩展X射线吸收精细结构
ZSM-5型
沸石
傅里叶变换红外光谱
材料科学
协调数
过渡金属
无机化学
氧烷
红外光谱学
金属
离子交换
分析化学(期刊)
化学工程
X射线吸收光谱法
物理化学
催化作用
化学
微型多孔材料
离子
吸附
吸收光谱法
有机化学
物理
量子力学
工程类
作者
Lucie Drozdová,Pasqualino Marturano,Blanka Wichterlová,Andreas Kogelbauer,Roel Prins
标识
DOI:10.1007/978-94-010-0782-5_6
摘要
EXAFS spectroscopy is a very powerful tool to gain an insight of the structures of transition-metal complexes embedded in the pores of zeolitic materials. The existence of binuclear oxo-iron clusters in Fe/ZSM-5, which was postulated on the basis of FTIR and CO/H2 TPR experiments, was unambiguously confirmed by EXAFS. By comparison with data of Fe model- complexes available in the literature, it is proposed that the Fe species adopt a structure closely resembling the “diamond core” of the methane monooxygenase enzyme (Fe(μ-OH)2Fe). The EXAFS measurements provided Co-O distances and coordination numbers for Co/FER, MFI and MOR samples and thus enabled to characterize the average Co ion site in the zeolite framework. The results also indicated, in agreement with FTIR spectra, that Co ions deform the zeolite support to reach an optimal bonding with the framework.
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