The simultaneous catalytic reduction of NO and N2O by NH3 using an Fe-zeolite-beta catalyst

被引：83

作者：

Coq, B ^{[1
]}

Mauvezin, M ^{[1
]}

Delahay, G ^{[1
]}

Butet, JB ^{[1
]}

Kieger, S ^{[1
]}

机构：

[1] ENSCM, UMR CNRS ENSCM 5618, Lab Mat Catalyt & Catalyse Chim Organ, F-34296 Montpellier 5, France

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2000年 / 27卷 / 03期

关键词：

nitric oxide; nitrous oxide; ammonia; iron; zeolite-beta; selective catalytic reduction;

D O I：

10.1016/S0926-3373(00)00148-X

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：

An Fe-Zeolite-beta (Fe-BEA) catalyst, composed only of Fe cations or oxocations in charge compensation sites of the zeolite, is active in the simultaneous removal of NO (1500 ppm) and N2O (1000 ppm) by NH3 (2500 ppm) in the presence of O-2 (3 vol.%). In temperature-programmed surface reaction (TPSR) experiments (ramp: 10 K min(-1) from 423 to 823 K, space velocity: 200,000 h(-1)), the light-off temperature, at 50% conversion, is shifted to lower values viz. by 20 K for NO (approximate to 590 K) and 40 K for N2O (approximate to 670 K), compared to those found when processing NO and N2O alone. It is proposed that the removal of surface oxygen O*, coming from the interaction of N2O with iron sites, is faster with NO than with NH3. NO2 which is then formed reacts in turn very fast with NO and NH3 through the classical selective catalytic reduction (SCR) of NOx by NH3 in the presence of O-2. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：193 / 198

页数：6

共 34 条

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