Isotopic study of the influence of oxygen interaction and surface species over different catalysts on the soot removal mechanism

In order to improve the catalytic formulations for soot removal in after-treatment emission control technologies gasoline and diesel engine vehicle, an isotopic study was approached using transitory labeled oxygen response method over model catalysts that allows unraveling of oxidation mechanism. Ce-based materials promote exchange associated with high population lattice species (O 2- ) denoted as O I type. The incorporation praseodymium produces a Pr 3+ enrichment decrease energy release increase mobility through surface subsurface centers II type) depending on synthesis procedure. For PtBaK catalyst, III are responsible exchange. Gas-solid reaction between gas phase molecular is direct uncatalyzed oxidation. ceria containing catalysts, low-temperature takes place intervention atomic superoxide species. DPNR PtBaK/Al 2 3 , elimination occurs type centers. presence NO, assisted cooperative mechanism due NO adsorbed nitrate trimetallic catalyst enhances capacity. • CeO 18 / 16 prevails increases uptake. promotes single-atom being main detected Soot depends or mobility. CePr mixed oxides able remove at low temperature under inert conditions. more efficient intervention.