Abstract
The selective catalytic reduction (SCR) of NOx by C 2H 5OH was studied in excess oxygen over Ag/Al 2O 3 catalysts with different Ag loadings at lab conditions. The 4% Ag/Al 2O 3 has the highest activity for the C 2H 5OH-SCR of NOx with a drawback of simultaneously producing CO and unburned THC in effluent gases. An oxidation catalyst 10% Cu/Al 2O 3 was directly placed after the Ag/Al 2O 3 to remove CO and unburned THC. Washcoated honeycomb catalysts were prepared based on the 4% Ag/Al 2O 3 and 10% Cu/Al 2O 3 powders and tested for the C 2H 5OH-SCR of NOx on a diesel engine at the practical operating conditions. Compared with the Ag/Al 2O 3 powder, the Ag/Al 2O 3 washcoated honeycomb catalyst (SCR catalyst) has a similar activity for NOx reduction by C 2H 5OH and the drawback of increasing the CO and unburned THC emissions. Using the SCR + Oxi composite catalyst with the optimization of C 2H 5OH addition, the diesel engine completely meets EURO III emission standards.
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