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Kinetics Study on the Thermal Decomposition of Lanthanum Oxalate Catalysed by Zn-Cu Nano Ferrites

Author Affiliations

  • 1 P.G. Department of Chemistry, Orissa University of Agriculture and Technology, Bhubaneswar 751003(Orissa), INDIA

Res. J. Material Sci., Volume 3, Issue (2), Pages 1-8, June,16 (2015)

Abstract

Nanostructured zinc-copper mixed ferrite was synthesized using sol-gel method. XRD patterns of different compositions of zinc copper ferrite, Zn(1 CuFe (x = 0.0, 0.25, 0.50, 0.75), revealed single phase inverse spinel ferrite in all the samples. With increasing copper concentration, the crystallite size increases from 30 nm to 50 nm. The surface morphology of all the samples studied by the Scanning Electron Microscopy showing porous structure of particles throughout the sample. The prepared samples were also analysed by XRD, FTIR, TEM. Catalytic activity of the prepared samples were studied on lanthanum oxalate decomposition by Thermogravimetric methods (TGA). The rate constant k has got the highest value with x=0.75 and 5 mol% concentration and highest value is attributed to high copper concentration and also due to ion pairs as a result of mutual charge interaction i.e. besides the one component sites Cu2+ Cu, Fe3+ Fe2+ , there will be also the mixed sites Cu2+ Fe as well as Cu Fe2+. In other words, the increasing activity of mixed oxides is attributed to enhanced concentration of active sites by creating new ion pairs. With increasing Zn content increases particle size thereby providing comparatively less surface area for the catalytic activities due to large ionic radii of Zinc. Catalytic activity of ferrite powders changes remarkably due to the changes of the valence state of the components of the ferrites, responsible for catalytic activities and that oxidises the carbon monoxide released from Lanthanum oxalate

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