IR studies of the transformations of nitrogen-containing organic intermediates during selective reduction of nitrogen oxides by hydrocarbons

Thermal transformations of nitromethane and deuterated acetonitrile adsorbe d on the surface of H-ZSM-5, Cu-ZSM-5, Co-ZSM-5 has been studied by IR spec troscopy. The nature of cation has been found to greatly affect the transfo rmation pathways of these species as possible intermediates in the NOx sele ctive reduction by hydrocarbons, thus explaining the different selectivitie s of these catalysts.