A comparison of NOx adsorption on Na, H and BaZSM-5 films

被引：22
|
作者：
Perdana, Indra
Creaser, Derek [1 ]
Ohrman, Olov
Hedlund, Jonas
机构：
[1] Chalmers, Dept Chem React Engn, SE-41296 Gothenburg, Sweden
[2] Lulea Univ Technol, Div Chem Technol, SE-97187 Lulea, Sweden
来源：
APPLIED CATALYSIS B-ENVIRONMENTAL | 2007年 / 72卷 / 1-2期
关键词：
NOx adsorption; monolith; ZSM-5; films; counter ions;
D O I：
10.1016/j.apcatb.2006.09.016
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：
NOx adsorption in ZSM-5 films containing Na+, H+ or Ba2+ as counter ions was studied. NaZSM-5 films showed a superior NOx adsorption capacity over the entire temperature range (30-350 degrees C) in comparison with the other films. Besides the possibility to form strongly bound surface nitrate species, the presence of the Na+ ions in ZSM-5 resulted in a large enhancement of various weakly adsorbed species. In the HZSM-5 film, the NOx adsorption was mainly due to physisorption, surface nitric acid and nitrosium ion (NO+) formation. Besides weakly adsorbed species and surface nitric acid, the NOx adsorption in BaZSM-5 films also resulted in formation of strongly bound surface nitrate species. The nitrate species in the BaZSM-5 film were found to be resistant to NO exposure and were mainly formed through an NO2 disproportionation pathway. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码：82 / 91
页数：10
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