N-15 NMR-STUDIES OF THE NO-NH3-O-2 REACTION OVER ZSM-5 TYPE ZEOLITES AND VANADIA SUPPORTED CATALYSTS

N-15 nuclear magnetic resonance spectra produced by adsorption of NO t ogether with O-2 and NH3 on H-ZSM-5 and V2O5/Al2O3 catalysts have been examined. Several surface species and reaction intermediates have bee n identified by their characteristic N-15 MMR spectra. The intermediat e complexes between the products of disproportionation and partial oxi dation of NO, on one hand, and ammonia, on the other hand, were found to be formed in the reaction. On V2O5/Al2O3 catalyst the reaction proc eeds more rapidly compared with ZSM-5 but some details of the mechanis m are similar for both catalysts.