Influencia de la sal precursora sobre la actividad y mecanismo de reacción en la combustión catalítica de hollín.

MARTÍN S. GROSS*, CARLOS A. QUERINI

LA PLATA

Congreso; XV Congreso Argentino de Catálisis y 4° Congreso de Catálisis del MERCOSUR; 2007

CONACA

Elimination of diesel soot from automobiles involves three phases: catalyst as a solid phase, soot as another solid phase and gaseous phase (containing O2 and products of reaction, mainly CO2). The existence of two solid phases is the main limitation of the system. For this reason in the development of catalyst species with high mobility are preferred to favor the contact. In other words during combustion process in addition to intrinsically chemical phenomenon, physical phenomenon also takes place. It is well known that potassium among other properties presents compounds with good mobility, in this work catalysts of K/CeO2 are studied varying precursor potassium salt. Test of temperature-programmed oxidation were made to be able to infer the steps involved in the catalytic soot oxidation and also the effect of different precursors. It was found that anion of salt precursor has a strong influence over activity of catalyst. These results obtained are in agreement with those of other goups. Results of temperature-programmed oxidation test lead to complex combustion kinetic that cannot be represented by pseudohomogeneous models.