[Alumina-supported catalysts for the catalytic purification of lean-burn automobile exhaust].
Catalytic properties of Ag/Al2O3, In/Al2O3, Sn/Al2O3, Co/Al2O3, Pt/Al2O3 and a two-stage catalyst composed of Ag/Al2O3 and Pt/Al2O3 were investigated for the selective reduction of NO by C3H6 or C2H5OH in excess oxygen. The Ag/Al2O3 showed the highest NO reduction activity among the catalysts studied. A substantial amount of CO was formed over alumina-based transient metal oxides. HC and CO oxidations over Pt/Al2O3 occurred in relatively low temperatures, compared with the other catalysts. The sequential use of Ag/Al2O3 and Pt/Al2O3 was effective to broaden the temperature window for the reduction of NO, to improve oxidation of HC and CO and to inhibit the formation of N2O and CH3CHO.
Zhu
Tian-le
TL
Department of Environmental Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China. zhutl@buss.edu.cn
Hao
Ji-ming
JM
Fu
Li-xin
LX
Wang
Jian-xin
JX
Li
Jun-hua
JH
Liu
Zhi-ming
ZM
Cui
Xiang-yu
XY
D000393:Air Pollutants / Q000032:analysis*; D000537:Aluminum Oxide / Q000737:chemistry*; D002384:Catalysis; D010084:Oxidation-Reduction; D001335:Vehicle Emissions / Q000032:analysis* / Q000517:prevention & control*
D000393:Air Pollutants; D001335:Vehicle Emissions; D000537:Aluminum Oxide