Influence of co-cations in the selective catalytic reduction of NO by NH3 over copper exchanged faujasite zeolites

被引:71
作者
Kieger, S
Delahay, G
Coq, B
机构
[1] ENSCM, UMR CNRS 5618, Lab Mat Catalyt & Catalyse Chim Organ, F-34296 Montpellier 5, France
[2] Grande Paroisse SA, Usine Rouen, F-76121 Le Grand Quevilly, France
关键词
NO; SCR; NH3; Cu-FAU;
D O I
10.1016/S0926-3373(99)00112-5
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
The effect of a co-cation (Cs, Ba, Ca, Sr, Ba, La, Ce, Sm, Dy, Yb) on the properties of Cu exchanged faujasite catalysts in the selective catalytic reduction (SCR) of NO by NH3 in an oxidising atmosphere has been studied. Temperature programmed reduction (TPR) by H-2 of Cu-faujasite (Cu-FAU) was used as a tool to identify and quantify the nature and location of Cu species. The 'blocking' of sodalites cages of Cu-FAU by alkali earth or lanthanide ions enhanced the SCR activity at low temperature (LT) and made the reaction fully selective towards N-2 in the whole temperature range studied (up to 773 K). The formation of N2O in Cu-FAU zeolites results from the reaction between nitrogen monoxide and ammonia on next-nearest-neighbour (NNN) Cu ions located in sodalite cages. (C)2000 Elsevier Science B.V All rights reserved.
引用
收藏
页码:1 / 9
页数:9
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