Abstract
Abstract A 0.5 wt.% Pt/TiO 2 catalyst was prepared and used for the low-temperature selective catalytic reduction (SCR) of NO with C 3H 6 in the presence of excess oxygen. The effects of Pt loading and O 2 concentration on Pt/TiO 2 catalytic performance for low-temperature SCR were investigated. It was found that optimal Pt loading was 0.5 wt.% and excess O 2 favored low-temperature SCR of NO x. The mechanism of low-temperature SCR of NO with C 3H 6 was investigated with respect to the behavior of adsorbed species over Pt/TiO 2 at 150°C using in situ DRIFTS. The results indicated that surface nitrosyl species (Pt δ+-NO and Ti 3+-NO) and Pt 2+-CO are main reaction intermediates during the interactions of NO, C 3H 6 and O 2. A simplified NO decomposition mechanism for the low-temperature SCR of NO with C 3H 6 was proposed.
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