[Selective catalytic reduction of NO on Ag, Co and Cu/Al2O3 in excess oxygen].
The catalytic activities of alumina-supported Ag, Co and Cu for selective reduction of NO with propene as reductant in the presence of excess oxygen were investigated. The catalytic performances of single-component catalysts with different metal loadings and of samples prepared by various methods such as mechanical mixing, one-step impregnation, two-step impregnation, etc. were studied. The experimental results showed that the Ag exhibited the highest conversion of NO to N2 (approximately 89% with 2% loading, wt.) among single-component catalysts, the lower was Co, and the lowest was Cu. The sequence of the temperature for the maximum conversion was on the order of Cu < Co < Ag. For Ag catalysts, the activities between samples of identical loadings prepared by one-step and two-step impregnation were almost the same. The activities of mixed samples were not the simple sum of the single-component catalysts. The mixed Ag-Co sample possessed the highest activity (80% above). The activities of the combinatorial samples declined comparatively to some extent. The activities of one-step impregnation samples descended more markedly and the highest conversion was only over 30%.
Cui
Xiang-yu
XY
Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China.
Hao
Ji-ming
JM
Fu
Li-xin
LX
Li
Jun-hua
JH
Zhu
Tian-le
TL
Liu
Zhi-ming
ZM
D000397:Air Pollution / Q000517:prevention & control*; D000475:Alkenes / Q000737:chemistry; D000537:Aluminum Oxide / Q000737:chemistry; D002384:Catalysis; D003035:Cobalt / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D009569:Nitric Oxide / Q000737:chemistry*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry; D012834:Silver / Q000737:chemistry*
D000475:Alkenes; D009569:Nitric Oxide; D003035:Cobalt; D012834:Silver; D003300:Copper; C013658:propylene; D000537:Aluminum Oxide; D010100:Oxygen