Abstract
The effect of hydrogen on catalytic soot oxidation was investigated to find new conditions for lowering the regeneration temperature in catalyzed diesel particulate filtration with hydrogen. Soot oxidation experiments using a flow reactor with a Pt/CeO2 catalyst were carried out to represent catalyzed diesel particulate filtration. Under conditions using more than 6% hydrogen with water, the soot oxidation by hydrogen started at 155 °C for loose contact conditions and at 175 °C for tight contact conditions. The soot oxidation rate tended to increase with increasing concentrations of hydrogen and oxygen. In contrast, no difference was observed with various water concentrations. The HO2 generated during hydrogen oxidation oxidized soot at low temperature. The soot oxidation temperature of 155 °C was lower than the regeneration temperature in catalyzed diesel particulate filtration reported previously.
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