%0 Journal Article
%T Effect of Potassium on Sol-Gel Cerium and Lanthanum Oxide Catalysis for Soot  Combustion
%A Daniela Salinas
%A Gina Pecchi
%A Vicente Rodr¨ªguez
%A Jos¨¦ Luis Garc¨ªa Fierro
%J Modern Research in Catalysis
%P 68-77
%@ 2168-4499
%D 2015
%I Scientific Research Publishing
%R 10.4236/mrc.2015.43009
%X 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<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> and La<sub>2</sub>O<sub>3</sub>-Al<sub>2</sub>O<sub>3</sub> with charges of 3 and 5 wt% of CeO<sub>2</sub> and La<sub>2</sub>O<sub>3</sub>. Potassium impregnation is performed to reach 3 atoms of K per nm<sup>2</sup> 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<sub>2</sub>O and oxygen responsible for the vacancies and/or lattice defects (O<sup>2<span style=\"white-space:normal;\"><span style=\"font-size:6.5pt;\" \"=\"\"><span style=\"font-size:6.5pt;font-family:'} ';\">&amp;minus;</span></span></span></sup>) 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.
%K Sol-Gel
%K Potassium
%K Cerium
%K Lanthanum
%K Soot Combustion
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=58065