Hydrogen production by reforming of diesel fuel over catalysts derived from LaCo1-xRuxO3 perovskites: Effect of the partial substitution of Co by Ru (x =0.01-0.1)

摘要

LaCoi _XKU;J3 perovskites with different substitutions of Co by Ku (x = 0.01 -u. 1) have been investigated as precursors of catalysts for the oxidative reforming of diesel for hydrogen production. The physicochemical characterization of LaCoi_xRuxO3 perovskites revealed modifications in their structure, crystalline size and surface area with the incorporation of ruthenium into the perovskite lattice. The modifications in the perovskites affect the structure and morphology of the catalysts obtained by reduction of perovskites prior the reaction. In the catalysts derived from ruthenium-containing perovskites it is observed a better reducibility, smaller particle size of La2O3 and Co0 phases and better surface concentration of Ru° particles with the increase in the degree of Co substitution in the perovskite. The modifications in the characteristics of the catalysts induced by the Co substitution in perovskite directly affect their catalytic behaviour in the oxidative reforming of diesel. It is found that the greater Co° + Ru° exposition and the higher extension of the l^ChCCh phase achieved in catalysts derived from perovskites with higher cobalt degree of substitution produces an increase in the activity and stability of the catalysts derived.