Selectivity to N//2 in the reaction of NH//3 with metal oxides has been markedly increased by the addition of Pt/Al//2O//3 to the metal oxides, whereas the activity of the metal oxides has not been changed. The metal oxides on their own have oxidized NH//3 to NO, NO//2, and N//2O as well as N//2, and furthermore, the selectivities in the reaction with metal oxides have depended markedly on the reaction temperature and inlet concentration of NH//3 in the pulse. In the oxidation of NH//3 with metal oxide-Pt/Al//2O//3 mechanical mixtures, N//2 has been selectively produced irrespective of the reaction temperature and the inlet concentration of NH//3 in the pulse. The activity of the mixtures has been shown, on the other hand, to be the same as that of the metal oxides.
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