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ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.

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The partial substitution of Co by Ru in lanthanum cobaltite perovskites (LaCo 1-x Ru x O 3 , x = 0.05 and 0.2) and its influence on the reducibility and structural modifications in the perovskite lattice have been evaluated by N 2 adsorption isotherms, in-situ XRD, TPR and XPS. Characterization of LaCo 1-x Ru x O 3 perovskite precursors reveal that Ru is incorporated into the perovskite lattice, producing a distortion of the original rhombohedral structure, a decrease in mean crystallite size and some increase in the surface area. The structural evolution of the LaCo 1-x Ru x O 3 precursors under a reductive treatment indicates that Ru promotes the reducibility of the perovskite leading to a greater reduction degree of cobalt species. Moreover, the smaller perovskite crystallites obtained with the partial substitution of cobalt by ruthenium evolve to smaller crystal domains of both Co 0 and La 2 O 3 after reduction. The catalysts formed after the reduction of perovskite precursors present very high catalytic efficiency to extract hydrogen from diesel molecules by oxidative reforming. However, those catalysts derived from Ru-substituted perovskites show better catalytic performance associated to the higher development of active metallic phases achieved on the surface of these catalysts. Additionally, Ru promotes the catalytic activity and stability for this reaction increasing the reduction degree of cobalt and decreasing coke formation and sulfur poisoning through the formation of smaller cobalt crystallites.

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