An AgMnOx catalyst (3.5 wt% Ag) incorporating silver ions in a Mn2O3 phase exhibits high performances for soot oxidation below 300�C. Its structural and redox properties have been investigated under reaction conditions using in situ XRD and DTA-TGA measurements. The catalyst appears unmodified during soot combustion experiments under oxygen, but in the absence of oxygen the soot is stoichiometrically oxidized by lattice oxygen leading to catalyst bulk reduction according to the steps Mn2O3 ? Mn3O4 ? MnO.The isotopic reaction product composition (C16O2, C18O16O, C16O2, C16O and C18O) obtained during soot combustion experiments under 18O2 reveals that the reaction follows a redox mechanism, in which the transfer of lattice oxygen from the catalyst to the soot is responsible for the soot ignition at low temperature.

Mechanistic study of diesel soot combustion over an AgMnO<sub>x</sub> catalyst

244th National Meeting (2012)

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Mechanistic study of diesel soot combustion over an AgMnOx catalyst

Mechanistic study of diesel soot combustion over an AgMnO_x catalyst