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Title: Surface properties and catalytic performance of La1− xSrxCrO3 perovskite-type oxides for CO and C3H6 combustion
Authors: Benabbas, Abderrahim
Keywords: Catalytic combustion; Lanthanum chromite; La1 xSrxCrO3 perovskites; CO and C3H6 oxidation; SOFC
Issue Date: Apr-2006
Publisher: universite de bouira
Citation: Elsevier Science
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. 2006 Elsevier B.V. All rights reserved.
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