Effect of extra-framework gallium on the structure of iron species in Fe/ZSM-5
Effect of extra-framework gallium on the structure of iron species in Fe/ZSM-5
复制标题
骨架外镓对 Fe/ZSM-5 中铁物种结构的影响
DOI：
10.1016/j.jcat.2008.09.001
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发表时间：
2008-10
影响因子：
7.3
通讯作者：
Su, Weiguang
中科院分区：
文献类型：
--
作者：
Sun, Keqiang;Fan, Fengtao;Sun, Keju;Ying, Pinliang;Li, Can;Feng, Zhaochi;Xia, Haian;Su, Weiguang
采用固态离子交换法制备了一系列不同Ga含量的Fe/Ga- zsm -5催化剂。采用紫外和可见光拉曼光谱、紫外-可见光漫反射光谱、h2 -程序升温还原和523 K下N2O分解等方法研究了框架外Ga对Fe/Ga- zsm -5催化剂中Fe物种性质的影响。在Fe/Ga- zsm -5中引入超框架Ga和高温处理对Fe的分布甚至性质都有显著影响。对于高温处理的催化剂，外框架Ga的存在显著增加了Fe（II）位的数量和N2O直接分解活性，表明外框架Ga可以促进N2O分解活性位的形成。对框架外Ga的有益作用的可能解释是，框架外Ga促进了双核和寡核Fe（III）位点的还原，形成Fe（II）位点，并与低核Fe位点相互作用，形成高温处理催化剂的Fe - Ga - o混合相。
A series of Fe/Ga-ZSM-5 catalysts with different Ga contents were prepared by solid-state ion exchange method. Ultraviolet and visible Raman spectroscopy, ultraviolet–visible diffuse reflectance spectroscopy, H2-temperature-programmed reduction, and N2O decomposition at 523 K were used to investigate the effect of extra-framework Ga on the nature of the Fe species in Fe/Ga-ZSM-5 catalysts. Introducing extra-framework Ga and high-temperature treatment can significantly affect the distribution even the nature of the Fe species in Fe/Ga-ZSM-5. For the high-temperature treated catalysts, the presence of extra-framework Ga remarkably increases the amount of the Fe(II) sites and the activity of direct N2O decomposition, suggesting that extra-framework Ga can promote the formation of the active sites for N2O decomposition. The possible interpretation of the beneficial role of extra-framework Ga is that extra-framework Ga facilitates the reduction of bi- and oligo-nuclear Fe(III) sites to form the Fe(II) sites and interacts with the Fe sites with low nuclearity to form a mixed Fe–Ga–O phase for the high-temperature treated catalysts.
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影响因子：
7.3
作者：
El-Mekki El-Malki-El-Mekki-El-Malki-146598724;V. Santen;W. Sachtler
通讯作者：
El-Mekki El-Malki-El-Mekki-El-Malki-146598724;V. Santen;W. Sachtler
影响因子：
7.3
作者：
Dubkov, KA;Ovanesyan, NS;Panov, GI
通讯作者：
Panov, GI
影响因子：
3.6
作者：
B. Wichterlová
通讯作者：
B. Wichterlová
影响因子：
5.5
作者：
G. Centi;S. Perathoner;Rosa Arrigo;G. Giordano;A. Katović;V. Pedulà
通讯作者：
G. Centi;S. Perathoner;Rosa Arrigo;G. Giordano;A. Katović;V. Pedulà
影响因子：
7.3
作者：
Pérez-Ramírez, J;Kumar, MS;Brückner, A
通讯作者：
Brückner, A