期刊
JOURNAL OF ENVIRONMENTAL SCIENCES
卷 22, 期 9, 页码 1441-1446出版社
SCIENCE PRESS
DOI: 10.1016/S1001-0742(09)60273-4
关键词
NO; low-temperature SCR; Pt/TiO2; in situ DRIFTS
资金
- National Natural Science Foundation of China [20807027]
- Special Foundation of Nanometer Technology from Shanghai Municipal Science and Technology Commission of China [0752 nm005]
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 effects of Pt loading and O-2 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 O-2 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 degrees C using in situ DRIFTS. The results indicated that surface nitrosyl species (Pt delta+-NO and Ti3+-NO) and Pt2+-CO are main reaction intermediates during the interactions of NO, C3H6 and O-2. A simplified NO decomposition mechanism for the low-temperature SCR of NO with C3H6 was proposed.
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