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The catalytic activity in the soot combustion is reported for a series of potassium-promoter alumina supported catalysts prepared by the sol-gel method to be used in the catalytic combustion of soot. The studied systems correspond to CeO 2-Al 2 O 3 and La 2 O 3-Al 2 O 3 with charges of 3 and 5 wt% of CeO 2 and La 2 O 3. Potassium impregnation is performed to reach 3 atoms of K per nm 2 of the mixed oxide. The effect of the potassium incorporation increases its reducibility, decreases the surface area and forms a new type of oxygen that is stronger than the oxygen in mixed oxides with similar chemical nature. The existence of potassium oxides, K 2 O and oxygen responsible for the vacancies and/or lattice defects (O 2−) are related to good catalytic activity. Additionally, the presence of alkali affects the structural and textural characteristics of the catalyst, promoting the catalytic activity in soot combustion.

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CUBA RESUMENSe presentan resultados obtenidos en el estudio cinético realizado al sistema de molienda de la fábrica de cemento de "Palmarito de Cauto ", Santiago de Cuba, con vistas a la producción de cementopuzolánico PZ'250 con adición de hasta un 40 % de puzolanas. El presente trabajo avala satisfactoriamente las predicciones realizadas y permiten recomendar su utilización como un medio idóneo de eficiencia económica. SUMMARY A kinetic study realized in a moulding system in a cement factory ("Palmito de Cauto " Santiago de Cuba) is presented. This objective of this study is the production ofapozzolonic cement PZ-250 with an addition until 40% ofpozzolan.The present paper confirms the satisfactory predictions and permits to recommend the utilization it as a available way of economical efficiency.