Two catalytic ceramic filters for the treatment of a gas-oil burner exhaust were prepared by impregnation of ceramic filters with Cu/V/K/Cl powder catalyst supported on Al2O3 or TiO2. Catalytic performances were tested and compared with those of uncatalytic filters. Tests included temperature programmed soot oxidation in a flow reactor, constant temperature soot oxidation, and filter continuous operation at the burner exhaust. Experimental results showed that the catalyst significantly increases the rate of soot combustion reducing both light-off and burnout temperatures. Moreover, at 648 K the more active catalytic filter was continuously regenerated at the burner exhaust with a soot combustion rate of about 0.1 g/min.Tests performed in the presence of NO showed a further increase of the rate of catalytic combustion together with NO depletion. The extent and the rate of NO reduction depended on the soot/catalyst mass ratio. It is suggested that such a reduction was the result of two competitive reactions, i.e. the catalytic oxidation of NO to NO2 and the reaction of NOx with soot. The specific feature of the catalytic filter is the ability to catalyse both reactions.
Catalytic filter for diesel soot low temperature oxidation
1999
Conference paper
English
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