Author/Authors :
Obeid، نويسنده , , E. and Tsampas، نويسنده , , M.N. and Jonet، نويسنده , , S. and Boréave، نويسنده , , A. and Burel، نويسنده , , L. and Steil، نويسنده , , M.C. and Blanchard، نويسنده , , G. and Pajot، نويسنده , , K. and Vernoux، نويسنده , , P.، نويسنده ,
Abstract :
Long-term isothermal experiments of soot combustion were performed on Yttria-stabilized Zirconia, an oxygen ionic conductor, at 370, 390 and 410 °C. At these temperatures, isotopic experiment confirms that mobile YSZ bulk oxygens oxidize soot at the soot/YSZ interface. In parallel, the surface oxygen exchange process replenishes YSZ oxygen atoms. After long-term isothermal experiments, HR-TEM observations reveal that the remaining soot particles form a continuous thin film on some YSZ grains, which inhibits the oxygen potential gradient, then stopping the oxidation process. All these experiments are in good agreement with the proposed fuel-cell type mechanism of soot on YSZ.
Keywords :
Soot combustion , Yttria-stabilized zirconia , Surface oxygen exchange , Fuel-cell type mechanism , Diesel Particulate Filters
