Abstract

VALDERRAMA, Gustavo; URBINA DE NAVARRO, Caribay  and  GOLDWASSER, Mireya R. Dry reforming of methane over Co catalysts obtained of perovskite type oxides. Saber [online]. 2013, vol.25, n.1, pp.90-96. ISSN 1315-0162.

A series of perovskite-type precursors (La_1-xS_rxCoO₃ with x = 0; 0,2; 0,4) ) were studied which were prepared by the auto-combustion method and characterized by techniques such as X-ray powder diffraction (XRD), specific surface area (BET), temperature-programmed reduction (TPR) and transmission electron microscopy (TEM). After reduction, their catalytic activity toward CO₂ reforming of CH₄ was tested in a fixed bed reactor at 1073 ºK. X-ray diffraction patterns revealed the formation of the perovskite structure in all samples prepared. It was found that the activation route occurs through intermediary species producing Co⁰ nanoparticles highly dispersed in the La₂O₂CO₃-Sr_O solid matrix. These species are responsible of the high activity and inhibit the coke deposition despite the severe reaction conditions used.

Keywords : Syngas; heterogeneous catalysis; auto-combustion.

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