Structural Properties and Catalytic Activity of Sr-Substituted LaFeO3 Perovskite

doi:10.1016/S1872-2067(11)60388-4

Abstract

Abstract: Partial substitution of La³⁺ by Sr²⁺ in LaFeO₃ resulted in significant changes in its structure and catalytic activity. The perovskite structure was changed from orthorhombic in LaFeO₃ to nearly cubic in La_0.8Sr_0.2FeO₃. Replacement of La³⁺ by Sr²⁺ induced a positive charge deficiency that was compensated for by the oxidation of some Fe³⁺ to Fe⁴⁺ and the generation of oxygen vacancies, which greatly promoted the reducibility of the perovskite. La_0.8Sr_0.2FeO₃ gave considerably enhanced activity in CO oxidation and methane combustion because the oxygen vacancies accelerated the dissociation of gaseous oxygen on the surface in CO oxidation and facilitated the diffusion of lattice oxygen from the bulk to the surface during CH₄ combustion.

Key words: perovskite, lanthanum ferrite, substitution, reducibility, carbon monoxide oxidation, methane combustion

ZHANG Xiao-Jing, LI Hua-Ju, LI Yong, SHEN Wen-Jie. Structural Properties and Catalytic Activity of Sr-Substituted LaFeO₃ Perovskite[J]. Chinese Journal of Catalysis, 2012, 33(7): 1109-1114.

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Structural Properties and Catalytic Activity of Sr-Substituted LaFeO₃ Perovskite

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