• Fulltext

       

        Click here to view fulltext PDF


      Permanent link:
      https://www.ias.ac.in/article/fulltext/jcsc/122/02/0193-0201

    • Keywords

       

      Salol; solid acids; diphenyl ether; zirconia; vapour phase transesterification.

    • Abstract

       

      The transesterification of methyl salicylate with phenol has been studied in vapour phase over solid acid catalysts such as ZrO2, MoO3 and SO$^{2-}_4$ or Mo(VI) ions modified zirconia. The catalytic materials were prepared and characterized for their total surface acidity, BET surface area and powder XRD patterns. The effect of mole-ratio of the reactants, catalyst bed temperature, catalyst weight, flowrate of reactants, WHSV and time-on-stream on the conversion (%) of phenol and selectivity (%) of salol has been investigated. A good yield (up to 70%) of salol with 90% selectivity was observed when the reactions were carried out at a catalyst bed temperature of 200°C and flow-rate of 10 mL/h in presence of Mo(VI)/ZrO2 as catalyst. The results have been interpreted based on the variation of acidic properties and powder XRD phases of zirconia on incorporation of SO$^{2-}_4$ or Mo(VI) ions. The effect of poisoning of acid sites of SO$^{2-}_4$ or Mo(VI) ions modified zirconia on total surface acidity, powder XRD phases and catalytic activity was also studied. Possible reaction mechanisms for the formation of salol and diphenyl ether over acid sites are proposed.

    • Author Affiliations

       

      S Z Mohamed Shamshuddin1 N Nagaraju2

      1. Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012
      2. St. Joseph’s Research Center, 46, Langford Road, Shanthinagar, Bangalore 560 027
    • Dates

       
  • Journal of Chemical Sciences | News

© 2022-2023 Indian Academy of Sciences, Bengaluru.