Catalytic ceramic papers for diesel soot oxidation: A spray method for enhanced performance

• Ceramic papers are used as flexible structured supports for Ce and Co oxide.
• New spray deposition method is proposed and compared to classical drip impregnation.
• Spray method allows dispersing small active particles throughout the filter.
• Spray-made catalytic filters exhibit much higher performance in diesel soot oxidation.

A spray method is proposed to improve the catalytic properties of ceramic papers to be used as catalytic filters for removing diesel soot particles. Small particles of Ce and Co oxides, acting as active centers for the combustion of the soot retained by the filter, are efficiently and homogeneously deposited. On the contrary, the application of the conventional drip method results in bigger particles mainly agglomerated at the crossings between the fibers of the ceramic paper. As a result, catalytic papers prepared by the spray method exhibit much higher performance with soot combustion temperatures decreased by ~ 30 °C.

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