Reduction of NOx over various Fe/zeolite catalysts

被引：83

作者：

Chen, HY ^{[1
]}

Wang, X ^{[1
]}

Sachtler, WMH ^{[1
]}

机构：

[1] Northwestern Univ, Dept Chem, Ctr Catalysis & Surface Sci, VN Ipatieff Lab, Evanston, IL 60208 USA

来源：

APPLIED CATALYSIS A-GENERAL | 2000年 / 194卷

关键词：

SCR of No-x; Fe/zeolite catalysts; physical mixture catalysts; site accessibility in zeolite;

D O I：

10.1016/S0926-860X(99)00364-6

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：

A systematic comparison was made of the catalytic activity of a variety of Fe/zeolite catalysts in the selective catalytic reduction of NOx with iso-butane or propane, both with dry and wet feeds. All catalysts were prepared by subliming FeCl3 vapor onto the H-form of the zeolite, followed by Cl removal. The activities decrease in the order Fe/BEA > Fe/MFI >> Fe/FER > Fe/MOR approximate to Fe/Y. These differences are rationalized in terms of our mechanistic model and the known pore geometry of the zeolites. FT-TR shows that some Fe loaded narrow pore zeolites are able to oxidize NO to NO2 and form NOy. chemisorption complexes, but unable to let iso-butane enter the pores. Unlike some wider pore zeolites that become covered by a carbonaceous deposit at low temperature, these materials retain their high activity for NO oxidation. Mixtures of Fe loaded wide and narrow pore zeolites, therefore, lead to higher steady-state activities at low temperature than single catalysts. In particular, the combination of Fe/MFI with Fe/FER displays a spectacular activity enhancement. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：159 / 168

页数：10

共 22 条

[1] Mechanistic cause of hydrocarbon specificity over Cu/ZSM-5 and Co/ZSM-5 catalysts in the selective catalytic reduction of NOx [J].