• M P Gupta

      Articles written in Journal of Chemical Sciences

    • Mössbauer studies on ferrous-zinc ferrites prepared by a novel technique

      C E Deshpande S K Date M P Gupta M N S Murthy

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      Ferrous-zine ferrites, ZnxFe3−xO4(0<x<1) have been prepared using a new method involving the stabilization of FeO prior to its reaction with ZnO and Fe2O3. Mössbauer studies on these ferrites have given results regarding the hyperfine fields, quadrupole interactions and isomer shifts in good agreement with those reported earlier on the same ferrites prepared by more elaberate and expensive techniques. This confirms the reliability of the new technique, which being much simpler, is less prone to errors in stoichiometry.

    • Structural, magnetic and Mössbauer studies on MnxFe3−xO4 (0⩽x⩽1)

      P P Bakare M P Gupta S K Date A P B Sinha

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      Polycrystalline samples of MnxFe3−xO4 (0⩽x⩽1) have been prepared following a novel route involving a reaction of desired quantities of stabilized MnO and FeO with Fe2O3 at high temperatures. The novel route of preparation of pure MnxFe3−xO4 precludes the presence of Mn3+ and Fe2+ ions. These samples have been characterized for their structural and magnetic properties using x-ray diffraction, Fe57 Mössbauer spectroscopy and bulk magnetic measurements such as initial permeability, loss factor, remanence and coercivity. All our experimental data clearly show the formation of single cubic phase over the entire range of composition. The degree of inversion in these systems decreases with increasing manganese concentration.

    • Structural and catalytic studies of promoted iron oxide catalysts used in the dehydrogenation of ethylbenzene to styrene

      B A Sayyed M P Gupta S K Date K R Kamble A Y Sonsale A K Chatterjee

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      Alkali-ion promoted iron oxide was used as a catalyst for the non-oxidative dehydrogenation of ethylbenzene to styrene. Catalytic performance studies showed high activity, with selectivity ≈93% and conversion ≈49%. The fresh and used catalysts were characterised by various physicochemical techniques like scanning electron microscopy, x-ray diffraction and Mössbauer spectroscopy. X-ray and Mössbauer data clearly show the presence of α-Fe2O3 and Fe3O4 in the used catalysts and α-Fe2O3 in the fresh catalyst, the phases being identified from their standardd values and hyperfine interaction parameters.

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