Stability of Ba,K/CeO2 catalyst during diesel soot combustion: effect of temperature, water and sulfur dioxide

M.A. PERALTA, V. MILT, L.C. CORNAGLIA, C.A. QUERINI

Philadelfia, USA

Congreso; 19 NOrth American Meeting on Catalysis; 2005

Emissions from diesel engines contain soot and nitrogen oxides as main pollutants. The catalytic filter seems to be one of the most important alternatives in order to decrease the amount of soot in the exhaust gases. The catalyst deposited on a ceramic filter or foam must have activity at the temperature of the exhaust gases, which can be 400?C for heavy load engines, and 300?C or even lower for light duty engines. Additionally, the catalyst must have thermal and mechanical stability, and resistance to the presence of water and sulphided compounds. In spite of this, there are only few reports related to the stability of soot, specifically on the effect of water and SO2 tolerance [1,2]. In this paper, the stability of Ba,K/CeO2 catalysts during the oxidation of diesel soot is addressed. The effect of temperature, water and SO2 is studied in order to determine whether this material could be stable under real conditions. Activity is followed by Temperature-programmed-oxidation