• JAGADEESH PRASAD DASAPPA

      Articles written in Journal of Chemical Sciences

    • 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

      More Details Abstract Fulltext PDF

      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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