title: Performance and mechanism study for low-temperature SCR of NO with propylene in excess oxygen over Pt/TiO2 catalyst.
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 effects 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 degrees C using in situ DRIFTS. The results indicated that surface nitrosyl species (Ptdelta(+)-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.
authors.affiliation: Research Center for Combustion and Environmental Technology, Shanghai Jiao Tong University, Shanghai 200240, China. zixon@139.com
authors.forename: Zhixiang
authors.initials: Z
authors.lastname: Zhang
authors.forename: Mingxia
authors.initials: M
authors.lastname: Chen
authors.forename: Zhi
authors.initials: Z
authors.lastname: Jiang
authors.forename: Wenfeng
authors.initials: W
authors.lastname: Shangguan
mesh_terms: D000475:Alkenes / Q000737:chemistry*; D002384:Catalysis; D009569:Nitric Oxide / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*; D010984:Platinum / Q000737:chemistry*; D013696:Temperature; D014025:Titanium / Q000737:chemistry*
chemical_list: D000475:Alkenes; C009495:titanium dioxide; D009569:Nitric Oxide; D010984:Platinum; C013658:propylene; D014025:Titanium; D010100:Oxygen