Performance and mechanism study for low-temperature SCR of NO with
propylene in excess oxygen over Pt/TiO2 catalyst |
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Authors: | Zhixiang Zhang Mingxia Chen Zhi Jiang and Wenfeng Shangguan |
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Institution: | Research Center for Combustion and Environmental Technology,Shanghai Jiao Tong University,Shanghai 200240,China |
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Abstract: | A 0.5 wt.% Pt/TiO2 catalyst was prepared and used for the low-temperature selective catalytic reduction (SCR) of NO with C3H6 in
the presence of excess oxygen. The e ects of Pt loading and O2 concentration on Pt/TiO2 catalytic performance for low-temperature
SCR were investigated. It was found that optimal Pt loading was 0.5 wt.% and excess O2 favored low-temperature SCR of NOx. The
mechanism of low-temperature SCR of NO with C3H6 was investigated with respect to the behavior of adsorbed species over Pt/TiO2 at
150°C using in situ DRIFTS. The results indicated that surface nitrosyl species (Pt +-NO and Ti3+-NO) and Pt2+-CO are main reaction
intermediates during the interactions of NO, C3H6 and O2. A simplified NO decomposition mechanism for the low-temperature SCR
of NO with C3H6 was proposed. |
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Keywords: | NO low-temperature SCR Pt/TiO2 in situ DRIFTS |
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