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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