Zeolite supported Pt catalysts for reduction of NO under oxygen excess: a comparison of C_3H_6, HNCO and NH_3 as reducing agents

摘要

The effect of the zeolite SiO_2/Al_2O_3 ratio of ZSM-5 supported Pt catalysts on the reduction of NO under oxygen excess has been investigated. The activity and selectivity of three reducing agents were compared, i. e. C_3H_6, HNCO and NH_3. The maximum NO reduction with both C_3H_6 and HNCO as the reducing agent was affected by the SiO_2/Al_2O_3 ratio of the support. Although no effect was observed on the maximum NO reduction for NH_3, the yields of N_2 ad N_2O were affected. The results are put in perspective of reaction mechanisms proposed in the literature.