Catalytic Performance of La0.6Ca0.4Fe1-xNixO3 Perovskites in DME Oxidation

Abstract

Substituted La0.6Ca0.4Fe1-xNixO3 (0.0 ≤ x ≤ 1.0) perovskite-type oxides prepared by the amorphous citrate method have been investigated as catalysts in the dimethyl ether (DME) oxidation reaction. The samples with an x ≤ 0.3 composition show an orthorhombic structure, while the intermediate compositions with 0.5 ≤ x ≤ 0.9 show a less crystalline orthorhombic perovskite structure with segregated phases that increase upon increasing the Ni content. The progressive substitution of Fe3+ by Ni2+ in La0.6Ca0.4FeO3 entails the progressive formation of oxygen vacancies and Fe4+ species for Ni substitution degrees of x ≤ 0.5. For larger degrees of substitution with x > 0.7, segregated phases and a progressive loss of the perovskite structure are detected. The highest catalytic performance for the total combustion of DME is obtained from equimolar substitution in the B-site position (Fe0.5Ni0.5), in which a large extent of Fe4+ species and oxygen vacancies are present.

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Pecchi, G. , Morales, R. , Salinas, D. , Delgado, E. and Fierro, J. (2015) Catalytic Performance of La0.6Ca0.4Fe1-xNixO3 Perovskites in DME Oxidation. Modern Research in Catalysis, 4, 97-106. doi: 10.4236/mrc.2015.44012.

Conflicts of Interest

The authors declare no conflicts of interest.

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