Abstract
The effect of soot on the NO x storage-reduction performances of a Pt–K/Al2O3 catalyst is analysed in this work by performing lean-rich cycles at constant temperature. The interaction between soot and the stored NO x has been also investigated by temperature programmed methods. It has been found that the presence of soot reduces the NO x storage capacity of the catalyst; besides the presence of soot favours the decomposition of the stored nitrates. A direct reaction between the stored nitrates and soot is suggested, that has been explained on the basis of the surface mobility of the adsorbed nitrates.
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