N_2O formation over CeO_2-ZrO_2 mixed oxides supported metal (Pt,Pd, Rh) catalysts for automotive exhaust control

摘要

N_2O formation under stoichiometric cycled condition over three monometallic ceriazirconia catalysts has been investigated. A strong dependence between the N_2O production and the temperature at which NO reduction occurs wa snoted, i.e. the lower temperature the higher the amount of N_2O produed. Among the three monometallic catalysts, the one with Rh produces lower N_2O concentration. The N_2O disappearance observed at high temperature is suggested to be due to both its removal and unfavorable conditions for its formation.