Abstract
The effects of CO on the catalytic activities of Ag/Al2O3 for NOx reduction by propane were investigated. Unlike on 1% Ag/Al2O3, the significant promotion effect of CO was observed on Ag catalyst with higher Ag loading. The presence of CO obviously broadened the operation window of C3H8-SCR on 5% Ag/Al2O3, and the temperature range was expanded from 425–510°C to 375–545°C. CO did not involve in NO reduction directly. In situ DRIFTS in different feed gases showed that the presence of CO promoted the partial oxidation of C3H8 on 5% Ag/Al2O3 and led to the obvious increases in the amount and variety of intermediate species of C3H8 partial oxidation, namely the enolic and acetate species, which promoted NOx removal significantly.
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