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Co2+ substituted La2CuO4/LaCoO3 perovskite nanocomposites: synthesis, properties and heterogeneous catalytic performance

Abstract

Cobalt substituted La2CuO4/LaCoO3 perovskite nanocomposites were prepared using microwave combustion method. X-ray diffraction analysis showed that Co2+ substitution in La2CuO4 induced the formation of secondary LaCoO3 phase with rhombohedral structure along with the existing orthorhombic (La2CuO4) structure. The orthorhombic/rhombohedral structured nanocomposites possessed an average crystallite size in the range 36 - 46 nm and 21 - 49 nm respectively. The Rietveld analysis confirmed the formation of these two phases. The appearance of FT-IR bands around 682 and 516 cm-1 were correlated to the orthorhombic stretching modes while 580 and 445 cm-1wereassociated to rhombohedral stretching modes thereby confirming the two-phase perovskites system. Optical study revealed, two linear regions depicting two band gaps related to La2CuO4 and LaCoO3 phases. The band gap was foundto increase with the increase in Co2+ doping fraction. Morphological observations using scanning electron microscopy showed intragranular pores and fused grains with distinct grain boundaries. The modification in magnetic properties was associated most probably withthe exchange of A and B sites within La2CuO4 host lattice because of Co2+ doping, as well as the important phase composition of La2CuO4/LaCoO3 occurrence from ferromagnetic-to-paramagnetic transition. The BET surface area of pure and doped nanocomposites was found to vary considerably within the range 12.2 - 43.7 m2/g. The as-fabricated La2CuO4/LaCoO3 perovskite nanocomposites were evaluated for the conversion of glycerol to formic acid in liquid phase batch reactor at atmospheric conditions. This La3+ based nanocomposite behaves as an efficient bifunctional catalyst with high conversion efficiency and selectivity around 96.5% and 95.1% respectively.

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Publication details

The article was received on 14 Aug 2018, accepted on 08 Oct 2018 and first published on 09 Oct 2018


Article type: Paper
DOI: 10.1039/C8NJ04133D
Citation: New J. Chem., 2018, Accepted Manuscript
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    Co2+ substituted La2CuO4/LaCoO3 perovskite nanocomposites: synthesis, properties and heterogeneous catalytic performance

    M. Sukumar, L. J. Kennedy, J. J. Vijaya, B. Al-Najar and M. Bououdina, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ04133D

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