Zirconia supported La, Co oxides and LaCoO3 perovskite: structural characterization and catalytic CO oxidation |
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Authors: | S Colonna S De Rossi M Faticanti I Pettiti and P Porta |
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Institution: | a Istituto di Struttura della Materia, CNR, Via Fosso del Cavaliere 100, 00133, Rome, Italy b Centro di Studio, Struttura e Attività Catalitica di Sistemi di Ossidi’, CNR, c/o Dipartimento di Chimica, Università degli Studi di Roma, La Sapienza’, Piazzale Aldo Moro 5, 00185, Rome, Italy |
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Abstract: | ZrO2-supported La, Co oxide catalysts with different La, Co loading (2, 6, 8, 12 and 16 wt.% as LaCoO3) were prepared by impregnation of tetragonal ZrO2 with equimolar amounts of La and Co citrate precursors and calcination at 1073 K. The catalysts were characterized by X-ray diffraction (XRD), X-ray absorption spectroscopy (XAS), and BET specific surface area determination. Catalytic CO oxidation was performed at 298–800 K. XRD revealed the presence of tetragonal zirconia with traces of the monoclinic phase. LaCoO3 perovskite was also detected for loading higher than 6%. XAS experiments suggested that at high loading LaCoO3 and Co3O4 were formed, while at low loading, La, Co oxide species interacting with support, and hard to be structurally defined, prevailed. The catalysis study evidenced that the catalytic activity was due to segregated and highly dispersed cobalt oxide species. |
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Keywords: | Zirconia-supported La Co perovskites CO oxidation |
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