Effect of Ca-Substitution in La1-Xcaxfeo3 Perovskites on the Catalytic Activity for Soot Combustion

JIMÉNEZ, R.; ZAMORA, R.; G. PECTIN, G.; GARCÍA, X.; GORDON, A.
Fuel Processing Technology 91 (2010) 546-549.

DOI: 10.1016/j.fuproc.2009.12.017

Abstract

La_1 − xCa_xFeO₃ (x = 0.1, 0.2, 0.3 and 0.4) perovskites, prepared by the citrate method and characterized by AAS, XRD, TPR-H₂ and TPD-O₂, were assayed, and its catalytic activity evaluated for soot combustion, using carbon black as a model compound for soot. The catalytic activity was determined by non-isothermal thermogravimetric analysis. A significant enhancement of the catalytic activity was found by increasing the degree of La³⁺ substitution by Ca²⁺ in the perovskites, which coincided with an increase of the α-oxygen concentration and thus, a probable enrichment of the CB surface with these oxygenated species, at the start of the combustion.