Mejora en la formulación catalítica de papeles cerámicos para la eliminación de contaminantes diesel

S.A. LEONARDI; E.M. GAIGNEAUX; D.P. DEBECKER; E.E. MIRÓ; V.G. MILT

Coimbra

Congreso; XXVI Congreso Iberoamericano de Catálisis, CICAT 2018; 2018

Two different series of flexible structured catalysts were prepared either by drip impregnation or by the spray method for the catalytic combustion of diesel soot, which consisted of Co,Ba,K or Co,Ce deposited on SiO2-Al2O3 ceramic paper matrixes. SEM images showed that the impregnation method generated catalytic particles concentrated as large chunks (> 10 m), mainly cumulated on ceramic fiber crossings, whereas the spraymethod produced smaller catalytic particles (< 1 m) well distributed throughout the ceramic paper. Co,Ba,K particulates appeared better dispersed on the surface of ceramic fibers than Co,Ce due to the presence of K. Additionally, FTIR spectra showed the formation of O22- and O2- species associated to CeO2 on those samples containing potassium that gave better catalytic properties to the Co,Ba,K-ceramic paper, resulting the Co,Ba,K drip impregnated the best catalyst both considering activity and stability. TPR experiments also indicated the formation of BaCoO3 in Ba-containing ceramic paper, which could help in maintaining the catalyst activity after several TPO runs through the capacity of this mixed perovskite-type oxide to trap and release NOx.