Efecto del Anión de la Sal de K sobre el Mecanismo de Reacción en la Combustión Catalítica de Hollín.

MARTÍN S. GROSS; MARÍA A. ULLA; CARLOS A. QUERINI

Armaçao dos Búzios, Rio de Janeiro, Brasil

Congreso; 15º Congresso Brasileiro de Catálise – 5º Congreso Mercosur de Catálisis; 2009

The aim of this work is to understand the reaction mechanism of catalytic soot combustion with K(7)/CeO2 catalysts prepared with different potassium precursors. Catalysts activity were determined by temperature programmed oxidation techniques (TPO) over catalyst:soot mixtures. By correct design of these experiments it was possible to observe transient phenomena which suggest that the oxidation mechanism involve several steps. It was found that the reaction rate keep increasing at constant temperature (for determinate precursors and certain temperatures values). By characterization techniques like FTIR, SEM, XRD, XPS and high frequency CO2 pulses, enough information was gathered in order to propose a reaction mechanism. With the kinetic model that correspond to this mechanism it was possible to satisfactorily simulate a series of complete and partial combustions in conditions completely different to those that had been used to obtain the kinetic parameters