ZIRCONIA-SUPPORTED COPPER AND KNO3 CATALYSTS FOR DIESEL SOOT COMBUSTION. DEACTIVATION BY HYDROTREATMENT AND SO2

SANDRA M. MOSCONI; MARÍA L. RUIZ; MARIA SILVIA LEGUIZAMÓN APARICIO; MARTA I. PONZI; ESTHER N. PONZI; ILEANA D. LICK

Current Catalysis

Shaobin Wang

Año: 2014 vol. 3 p. 1 - 13

2211-5455

In this study, the sulfur tolerance and hydrothermal stability of Cu-KNO3/ZrO2 catalysts in catalytic diesel sootoxidation were investigated. Supported alkaline nitrate catalysts have shown excellent activity for soot oxidation in thepresence of O2 or NO/O2. High-temperature water vapor treatments do not affect the catalytic activity, suggesting a goodhydrothermal stability of the catalysts. Treatments performed at high SO2 concentration lead to a partial deactivation ofthe catalysts for the combustion reaction in the presence of O2. The presence of copper improves the sulfur tolerance ofthe KNO3/ZrO2 catalyst for the combustion of soot in the presence of NOx. NO/O2 present in the feed flow of the reactorcan regenerate in situ nitrate anions that provide the redox cycles required for the reaction.