Author(s)

Sonia Ascaso, María Elena Gálvez, Rafael Moliner, María Jesús Lázaro

Instituto de Carboquímica, Consejo Superior de Investigaciones Científicas, Miguel Luesma Castán, Zaragoza, Spain.

Structured catalysts for the simultaneous removal of soot and nitrogen oxides were prepared by means of coating cordierite monoliths with alumina-based suspensions containing Cu, Co or Fe and Cs as the catalytically active phase. Textural and chemical properties of the coated monoliths were determined by means of N₂-physisorption, SEM and temperature programmed reduction. Their activity in the simultaneous removal of soot and NO_x was assayed in a lab-scale installation, using a carbon black as diesel surrogate. Catalysts containing Cs exhibited significant activity in deNO_x, however soot oxidation activity is poorly enhanced probably due to the low NO₂ evolution, pointing to a different NO_x adsorption mechanism in the present case, in comparison to previous observations on analogous K and Ba containing catalysts.

Exhaust Gas Cleaning; NOx Selective Reduction; Soot Oxidation; Cesium; Washcoating; Structured Catalysts

S. Ascaso, M. Gálvez, R. Moliner and M. Lázaro, "Cesium as Alkali Promoter in Me-Cs (Me = Cu, Co, Fe)/ Al₂O₃ Structured Catalysts for the Simultaneous Removal of Soot and NO_x," Modern Research in Catalysis, Vol. 2 No. 3, 2013, pp. 57-62. doi: 10.4236/mrc.2013.23009.