Zirconia-Supported Copper and KNO3 Catalysts for Diesel Soot Combustion. Deactivation by Hydrotreatment and SO2
Sandra Mosconi, Maria L. Ruiz, Maria S. Leguizamon Aparicio, Marta I. Ponzi, Esther N. Ponzi and Ileana D. Lick
Affiliation: CINDECA (CCT La Plata- CONICET-UNLP), Dpto. de Química, Fac. de Ciencias Exactas, 47 Nº 257, La Plata (Buenos Aires), 1900, Argentina.
In this study, the sulfur tolerance and hydrothermal stability of Cu-KNO3/ZrO2 catalysts in catalytic diesel soot
oxidation were investigated. Supported alkaline nitrate catalysts have shown excellent activity for soot oxidation in the
presence of O2 or NO/O2. High-temperature water vapor treatments do not affect the catalytic activity, suggesting a good
hydrothermal stability of the catalysts. Treatments performed at high SO2 concentration lead to a partial deactivation of
the catalysts for the combustion reaction in the presence of O2. The presence of copper improves the sulfur tolerance of
the KNO3/ZrO2 catalyst for the combustion of soot in the presence of NOx. NO/O2 present in the feed flow of the reactor
can regenerate in situ nitrate anions that provide the redox cycles required for the reaction.
Keywords: Diesel soot, Combustion, Hydrothermal stability, SO2.
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