Reaction of adsorbates derived from cyanuric acid on a Cu-MFI zeolite with nitrogen oxide and oxygen

The reaction of adsorbates derived from cyanuric acid on a Cu-MFI zeolite with NOx and O-2 has been studied by a pulse technique. The formation rate of N-2 in the NOx or NOx + O-2 pulse experiments on a cyanuric acid-preadsorbed Cu-MFI zeolite was much higher than that in the O-2 pulse system, indicating that the reactivity of the adsorbates with NOx is much higher than with O-2. The product distribution in the first five pulses was greatly changed by the presence of water but the summed product distributions were the same. The formation of surface NH3 or its derivatives during the reaction of NO and O-2 on cyanuric acid-preadsorbed Cu-MFI in the presence of H2O is postulated.