Abstract
The effect of NO and H 2O on the activity of a Cu/V/K/Cl/Ti based catalytic filter in the combustion of soot generated in the flame of a gas-oil burner has been investigated. Temperature programmed oxidation (TPO) of soot collected on a ceramic filter supporting the Cu/V/K/Cl/Ti catalyst was performed with a flow micro-reactor in the absence and in the presence of NO and H 2O in the reactant gas. The presence of NO and H 2O resulted in a substantial increase of the rate of carbon combustion, and also affected the selectivity (CO 2/CO ratio). The enhanced activity is mainly due to carbon oxidation by NO 2 formed by NO oxidation on the same catalyst. TPO test performed after sulphation of the catalytic filter evidenced a marked loss of activity. However, in the presence of NO and H 2O the activity of soot oxidation was mostly preserved.
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