The Effect of Different Active Sites on the Catalytic Activity of Fe-ZSM-5 Zeolite for N₂O Direct Decomposition

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• 作者：Quanhui Guo ; Biaohua Chen ; Yingxia Li and Jianwei Li
• 关键词：Fe ; ZSM ; 5 ; Zeolite ; N2O decomposition ; Br枚nsted acid ; Ion exchange
• 刊名：Catalysis Letters
• 出版时间：January, 2008
• 出版年：2008
• 期刊代码：13_1011372X
• 类别：ch
• 卷：120
• 期：1-2
• 页码：65-70
• 数据来源：sp

摘要

Fe-modified ZSM-5 zeolites (Si/Al = 25) were prepared by adopting the liquid ion-exchange method with nitrate and oxalate of iron as Fe precursors and their catalytic performance was studied in the N₂O decomposition reaction. The results of FT-IR and H₂-TPR investigations indicated that (i) part of the iron ions could replace Br枚nsted acid protons at the straight channel wall (α sites), intersection of straight and sinusoidal channels (β sites), and sinusoidal channel wall (γ sites) within the ZSM-5 zeolite; and (ii) different Fe precursors gave rise to various distributions of α, β, and γ sites. We observed that the Fe-ZSM-5 catalyst prepared with iron oxalate as Fe precursor outperformed the ones prepared with iron nitrate as Fe precursor in the direct decomposition of N₂O. Furthermore, the catalytic activity of iron ions located at the α sites was higher than those of iron ions located at the β and γ sites.