Mechanism investigations of soot oxidation over Ag-supported YSZ.

Abstract

SSCI-VIDE+CARE+ASR:ABO:PVEInternational audienceAs Particulate Matter (PM) vehicle emissions are regulated by US/EU standards, the use of DPF (Diesel Particle Filter) has been widely spread to comply with the regulations. The main problematic associated with DPF comes from its regeneration. Numerous silver supported catalysts have been reported as active materials for soot oxidation [1,2]. Such activity is explained by the ability to provide oxygen to the soot and by the mobility of silver at the surface of the catalyst. We investigated the soot oxidation mechanism by silver nanoparticles supported over a non-reducible, ionic conductor oxide: Yttria-Stabilized Zirconia (YSZ). YSZ is an active support for soot oxidation thanks to its bulk oxygen mobility [3,4]. This study reports the mechanism of soot on Ag/YSZ catalysts by using isotopic temperature programmed oxidation (TP18O2), isotopic isotherm and isotopic oxygen exchange