Adsorption and co-adsorption of NO and water on LaCu-ZSM5

The effect of water on NO adsorption on LaCu-ZSM5 has been studied by in-situ FIR at 50 degrees C identifying for which copper sites NO adsorption competes with water. The relative thermal stability of NO and H2O ad-species have been also determined by increasing the sample temperature from 50 to 400 degrees C. Water was removed from zeolite at temperature lower than that necessary to desorb NO, as both bridged and chelating nitrates, from copper sites.