TITLE:
Cesium as Alkali Promoter in Me-Cs (Me = Cu, Co, Fe)/ Al2O3 Structured Catalysts for the Simultaneous Removal of Soot and NOx
AUTHORS:
Sonia Ascaso, María Elena Gálvez, Rafael Moliner, María Jesús Lázaro
KEYWORDS:
Exhaust Gas Cleaning; NOx Selective Reduction; Soot Oxidation; Cesium; Washcoating; Structured Catalysts
JOURNAL NAME:
Modern Research in Catalysis,
Vol.2 No.3,
June
24,
2013
ABSTRACT:
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 NOx was assayed in a lab-scale installation, using a carbon black as diesel surrogate. Catalysts containing Cs exhibited significant activity in deNOx, however soot oxidation activity is poorly enhanced probably due to the low NO2 evolution, pointing to a different NOx adsorption mechanism in the present case, in comparison to previous observations on analogous K and Ba containing catalysts.