• SHRIKANTH K BHAT

      Articles written in Journal of Chemical Sciences

    • Recyclable Pd ionic catalyst coated on cordierite monolith for high TOF Heck coupling reaction

      SHRIKANTH K BHAT JAGADEESH D PRASAD M S HEGDE

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      Pd2+ ionic catalyst, Ti0.97Pd0.03O1.97 was coated over cordierite monolith by solution combustion method. The catalyst coated on the cordierite is nano-crystalline as seen from XRD studies. Coated catalyst was used for Heck coupling reactions with different substrates of aryl halides and olefins. Thus handling nanocrystalline catalyst powder is avoided by fixing it on a solid catalyst cartridge. Heck coupled products were characterized using 1H NMR, 13C NMR, Mass and FTIR spectroscopy. This catalyst showed high selectivity towards Heck coupling reaction. Turnover frequencies (TOF) for each of the reactions were found to be very high. The catalyst was recycled up to 7 times with total TOF 3017 h -1, which is found to be a new green technique in the Heck coupling reaction

    • An efficient Ti0.95Cu0.05O1.95 catalyst for ipso – hydroxylation of arylboronic acid and reduction of 4-nitrophenol

      SHRIKANTH K BHAT PRASANNA JAGADEESH PRASAD DASAPPA HEGDE M S

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      A stable, active and selective Ti0.95Cu0.05O1.95 catalyst, crystallized in anatase TiO2 structurewith 5% Cu2+ ions substituted for Ti4+ ions with 5% oxide ion vacancy has been synthesized by solutioncombustion method. The catalyst was coated over a cordierite monolith (Mg2Al4Si5O18) by solution combustionmethod. By the first principle density functional theory (DFT) calculations, 48 atoms bulk structurehas been optimized and density of states (DOS) has been calculated. Ti – O bond distribution in Ti0.95Cu0.05O1.95 has been compared with pure TiO2. Bond distribution analysis has shown longer Cu – O and Ti –O bonds compared to those in CuO and TiO2 creating Cu2+ and oxide ion vacancy as electrophilic andnucleophilic active sites, respectively. This catalyst was found to be very active for ipso – hydroxylation ofarylboronic acid and 4-nitrophenol reduction reactions at room temperature. Catalyst coated cordieritemonolith was used in the recycling process of the reaction for 20 cycles and cumulative turnover frequencywas found to be 184,840 h-1. Ti0.95Cu0.05O1.95 catalyst coated on cordierite monolith enhanced the rate of thereaction compared to powder catalyst and made the handling and recycling of the catalyst very easy.

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