A comparison of NOx adsorption on Na, H and BaZSM-5 films
Artikel i vetenskaplig tidskrift, 2007

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 (30-350ºC) 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.

counter ions

NOx adsorption


ZSM-5 films


Indra Perdana

Chalmers, Kemi- och bioteknik, Kemisk reaktionsteknik

Derek Creaser

Chalmers, Kemi- och bioteknik, Kemisk reaktionsteknik

Olov Öhrman

Jonas Hedlund

Applied Catalysis B: Environmental

0926-3373 (ISSN) 1873-3883 (eISSN)

Vol. 72 82-91