Abstract
Perovskite-type oxides La 1− x Ce x CoO 3 ( x = 0, 0.05 and 0.10) were prepared, characterized and evaluated in the selective CO oxidation reaction (SELOX). The citrate synthesis methodology favored the formation of perovskites with rhombohedral structure and low specific surface area (<14 m 2 g −1). TPR profiles showed intermediates during the reduction process but the addition of cerium not only inhibited its formation but also promoted structural modifications in the perovskite lattice. XRD diffractograms showed the formation of perovskite without phase segregation. Temperature programmed reactions showed selective CO oxidation at low temperature besides undesired reactions at higher temperatures. Catalytic tests of the SELOX reaction showed 100% of CO conversion at 200 °C. Higher temperatures favored hydrogen oxidation and methanation. Catalysts LaCoO 3 and La 0.95Ce 0.05CoO 3 presented good stability during 48 h of reaction. The LaCoO 3 catalyst was sensitive to the presence of H 2O and CO 2 in the feed stream, however its CO conversion was easily restored after removing these compounds from the feed stream.
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