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Title: Effect of calcination temperature on the structural characteristics and catalytic activity for propene combustion of sol–gel derived lanthanum chromite perovskite
Authors: Benabbas, Abderrahim
Keywords: LaCrO3–LaCrO4; Perovskite; Sol–gel; Calcination temperature; C3H6 combustion; SOFC
Issue Date: Mar-2007
Publisher: universite de bouira
Citation: Elsevier Science
Abstract: The perovskite type lanthanum chromite LaCrO3 has been synthesized by a sol–gel method. Its bulk structural and surface characteristics have been examined by X-ray diffraction (XRD), SEM, SBET measurements, Fourier Transform Infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) as a function of the calcination treatment performed between 200 and 1000 8C over the precursor powder and in correlation with information achieved from TG-DTA thermal analysis. The characterization results are employed to rationalize the catalytic behaviour of the system towards propene complete oxidation. It is shown that the catalytic activity becomes optimized when a single perovskite LaCrO3 phase is achieved upon calcination at T > ca. 700 8C. In contrast, coexistence of perovskite LaCrO3 and monazite LaCrO4 at lower calcination temperatures appears detrimental to the combustion activity of the system. # 2007 Elsevier B.V. All rights reserved.
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