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Current Catalysis
ISSN (Print): 2211-5447
ISSN (Online): 2211-5455
DOI: 10.2174/2211544702666131224233822      Price:  $58

Zirconia-Supported Copper and KNO3 Catalysts for Diesel Soot Combustion. Deactivation by Hydrotreatment and SO2

Author(s): Sandra Mosconi, Maria L. Ruiz, Maria S. Leguizamon Aparicio, Marta I. Ponzi, Esther N. Ponzi and Ileana D. Lick
Pages 206-212 (7)
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.
Graphical Abstract:
Diesel soot, Combustion, Hydrothermal stability, SO2.
CINDECA (CCT La Plata- CONICET-UNLP), Dpto. de Química, Fac. de Ciencias Exactas, 47 Nº 257, La Plata (Buenos Aires), 1900, Argentina.