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Ceria-based fuel-borne catalysts have been used to promote regeneration of the DPF, by lowering the soot-combustion temperature and favoring propagation of the combustion process throughout the soot layer, and thus to ensure durability of DPF efficiency over the EURO 4 standard limits. Since the market introduction of the PSA Peugeot Citroën DPF System for series applications, extensive works have been done to improve and simplify the DPF technology. A new enhanced ceria-based fuel-borne catalyst has been designed and developed to limit the DPF system maintenance. This paper proposes comparative studies of two different Ceria-based fuel-borne catalysts for DPF regeneration, particularly focussing on the enhanced catalytic activity of soot combustion: correlation between soot combustion and oxygen buffering is proposed to explain difference in catalytic activity, while catalytic activity on NOx species is not affected.