Effects of Additives to Pt/Al₂O₃ on Catalytic Decomposition of NO

Abstract

Catalytic decomposition of NO to N₂ and O₂ was performed over Pt/Al₂0₃ which was modified by various additives. The addition of Tb oxide enhanced the activity by a factor of 4, while K, P and Au decreased the activity. XRD and TEM observations revealed that Pt particles on Pt/Al₂0₃ and Tb-added Pt/Al₂O₃ grew into large crystallites in a similar way during the reaction. Oxygen spillover from Pt to Tb oxide probably accelerated the desorption of oxygen from the catalyst.