NO Oxidation Reaction Mechanisms over Microporous Materials

We show the occurrence of two reaction regimes for NO oxidation over H- and Na-zeolites: activity increases with decreasing temperature below 423 K, and activity increases with increasing temperature above 423 K. In-situ FTIR studies reveal that NO⁺ is the only N_xO_y species on the alumino-silicate zeolites at high temperatures.