Surface properties and catalytic performance of La1−xSrxCrO3 perovskite-type oxides for CO and C3H6 combustion |
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Authors: | K. Rida, A. Benabbas, F. Bouremmad, M.A. Pe a,A. Martí nez-Arias |
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Affiliation: | aLaboratoire d’Etudes sur les Interactions Materiaux-Environnements, Université de Jijel, Algeria;bInstituto de Catálisis y Petroleoquímica, CSIC, C/Marie Curie 2, Cantoblanco, 28049 Madrid, Spain |
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Abstract: | Catalytic CO oxidation and C3H6 combustion have been studied over La1−xSrxCrO3 (x = 0.0–0.3) oxides prepared by solid-state reaction and characterised by X-ray diffraction (XRD), nitrogen adsorption (BET analysis) and X-ray photoelectron spectroscopy (XPS). The expected orthorhombic perovskite structure of the chromite is observed for all levels of substitution. However, surface segregation of strontium along with a chromium oxidation process, leading to formation of Cr6+-containing phases, is produced upon increasing x and shown to be detrimental to the catalytic activity. Maximum activity is achieved for the catalyst with x = 0.1 in which mixed oxide formation upon substitution of lanthanum by strontium in the chromite becomes maximised. |
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Keywords: | Catalytic combustion Lanthanum chromite La1− xSrxCrO3 perovskites CO and C3H6 oxidation SOFC |
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