Selective removal of NO2 in the presence of oxygen and NO over Pd/SiO2 catalysts

被引：13

作者：

Li, MS ^{[1
]}

Seshan, K ^{[1
]}

Lefferts, L ^{[1
]}

机构：

[1] Univ Twente, Fac Sci & Tech, Inst Mech, Proc & Control Twente,IMPACT, NL-7500 AE Enschede, Netherlands

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2004年 / 50卷 / 03期

关键词：

NOx; NO2; reduction; Pd/SiO2; CO; propene; mechanism; deactivation; chlorine;

D O I：

10.1016/j.apcatb.2004.01.001

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：

Catalytic reduction of NO2 in the presence of excess oxygen and NO has been studied over a 0.2% Pd/SiO2 catalyst between 120 and 260degreesC. CO is effective in selective reduction of NO2 at temperatures below 180degreesC. Temperature programmed desorption (TPD) and FT-IR studies have been used to investigate the adsorption sites during the reaction conditions. A Langmuir-Hinshelwood mechanism involving oxidised Pd sites is proposed for the reduction of NO2 with CO, where both reactants adsorb competitively on Pd2+ sites. Cl deactivates the catalyst for the reduction of NO2 with CO. This problem can be overcome by using propylene as a co-reductant. Furthermore, addition of propylene widens the temperature window of operation. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：143 / 151

页数：9

共 44 条

[41] THE EFFECTS OF STRUCTURE ON THE CATALYTIC ACTIVITY AND SELECTIVITY OF V2O5/TIO2 FOR THE REDUCTION OF NO BY NH3 [J].