Catalytic reduction of N 2O by C 2H 4 over Fe-ZSM-5: formation and nature of carbonaceous deposits and influence of the addition of O 2

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The catalytic reduction of dinitrogen monoxide (N 2O) by ethylene (C 2H 4) in the absence and presence of O 2 is studied over Fe-ZSM-5 catalysts. Two types of carbonaceous deposits (C α, C β) are formed on Fe-ZSM-5 during the reduction of N 2O by C 2H 4 in the absence of O 2. The catalytic activity of Fe-ZSM-5 decreases with an increase in the amount of C α, while the catalytic activity is not affected by the presence of C β. The formation of these carbonaceous deposits is suppressed by the presence of O 2 in the feed gas, and the catalytic reduction of N 2O by C 2H 4 is promoted by O 2, since deactivation of Fe sites is prevented in the presence of O 2.