P. Ciambelli et al., The role of NO in the regeneration of catalytic ceramic filters for soot removal from exhaust gases, CATAL TODAY, 60(1-2), 2000, pp. 43-49
The effect of NO and H2O 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 coll
ected on a ceramic filter supporting the Cu/V/K/Cl/Ti catalyst was performe
d with a flow micro-reactor in the absence and in the presence of NO and H2
O in the reactant gas. The presence of NO and H2O resulted in a substantial
increase of the rate of carbon combustion, and also affected the selectivi
ty (CO2/CO ratio). The enhanced activity is mainly due to carbon oxidation
by NO formed by NO oxidation on the same catalyst. TPO test performed after
sulphation of the catalytic filter evidenced a marked loss of activity. Ho
wever, in the presence of NO and H2O the activity of soot oxidation was mos
tly preserved. (C) 2000 Elsevier Science B.V. All rights reserved.