A series of Cu-Mn-Ce/Al
2O
3 anodic alumina catalysts synthesized using the multi-impregnation method were employed to investigate the selective reduction of NO with C
3H
6 in the presence of excess O
2. The presence of Cu additive greatly promoted the low-temperature de-NO
x activity. A moderate loading of copper gave the most promising NO
x conversion. In contrast, no promotional effect on low-temperature de-NO
x activity was found when Mn was added to the alumina support. Although the Mn-supported catalyst exhibited a higher activity for the oxidation of NO to NO
2, the addition of Mn to the Cu-Ce/Al
2O
3 catalyst had no positive effect on NO
x reduction, due to the wasteful consumption of propene. The de-NO
x activity of the Cu-Ce/Al
2O
3 catalyst was maintained at a relatively high level, even in the presence of excess SO
2 (500 ppm) and H
2O (10 vol%). Furthermore, the presence of SO
2 was observed to greatly promote NO
x reduction at 723 K.
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