“Potassium Precursor Effect on Catalytic Soot Combustion Reaction Mechanism”

M.S. GROSS; M.A. ULLA; C.A. QUERINI

Salamanca (España)

Congreso; IX EUROPACAT; 2009

Diesel soot elimination is a very difficult problem. Catalytic filters seem to be one of the technological alternatives in order to trap and burn the soot, at the exhaust gas temperature. In order to advance in a rational catalyst design, the reaction mechanism must be understood. In spite of this need, and even though there are many papers in the field, detailed studies regarding soot combustion mechanism are scarce, and the real kinetic is not typically reported. In this study, we report data using potassium/ceria as catalyst for soot combustion, with the objective of obtaining a more realistic model for this reaction. Combining temperature programmed oxidation analyses using different heating rates and final temperatures with characterization techniques it was possible to observe transient phenomena during soot combustion that provided new insights on reaction mechanism. These findings help in the advancement towards a rational catalyst de