Preparation and pretreatment temperature influence on iron species distribution and N2O decomposition in Fe-ZSM-5

被引：33

作者：

Krishna, K ^{[1
]}

Makkee, M ^{[1
]}

机构：

[1] Delft Univ Technol, DelftChemTech, Reactor & Catalysis Engn, NL-2628 BL Delft, Netherlands

来源：

CATALYSIS LETTERS | 2006年 / 106卷 / 3-4期

关键词：

Fe-ZSM-5; sublimation; high temperature pretreatment; isolated iron species; hydroxylated iron species; -Fe(OH)(2)N2O decomposition; DRIFTs;

D O I：

10.1007/s10562-005-9628-y

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：

Fe-ZSM-5 catalysts are prepared by FeCl3 sublimation between 320 and 850 degrees C. The catalysts are characterised by XRD, H-2-TPR, NH3-TPD, NO adsorption by DRIFTs, and catalytic activity is evaluated for N2O decomposition. The influence of high temperature (850 degrees C) and pretreatment environment (air, He, He+H2O and H-2) on the nature of iron species in Fe-ZSM-5 is further investigated by DRIFTs. High temperature FeCl3 sublimation results in decreased FeOx formation, easily reducible and narrow distribution of iron species in close proximity to alumina in Fe-ZSM-5. High temperature FeCl3 sublimation or pretreatment results in isolated hydroxylated iron species, -Fe(OH)(2), which are not significant in Fe-ZSM-5 prepared by 320 degrees C FeCl3 sublimation followed by calcination below 600 degrees C. Fe-ZSM-5 prepared by high temperature FeCl3 sublimation show high N2O decomposition activity and the improved performance can be correlated to -Fe(OH)(2) species in close proximity to alumina.

引用

页码：183 / 193

页数：11

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