NO x adsorption in ZSM-5 films containing Na + , H + or Ba 2+ as counter ions was studied. NaZSM-5 films showed a superior NO x adsorption capacity over the entire temperature range (30–350°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 NO x adsorption was mainly due to physisorption, surface nitric acid and nitrosium ion (NO + ) formation. Besides weakly adsorbed species and surface nitric acid, the NO x 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 NO 2 disproportionation pathway.