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An Alternate Green Route to Synthesis of Mono and Diesters using Solid Acid Catalysts

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Author Affiliations

  • 1Applied Chemistry Department, Faculty of Technology and Engineering, The M. S. University of Baroda, Vadodara, 390 001, Gujarat, INDIA

Res.J.chem.sci., Volume 5, Issue (2), Pages 48-58, February,18 (2015)

Abstract

The conventional catalysts used in esterification reactions are liquid acids that are not environment friendly. Keeping with global trends, in the present endeavour, an effort has been made to replace the conventional homogeneous liquid acid catalysts by heterogeneous solid acid catalysts. M(IV) Phosphotungstates [M(IV)= Zr, Ti and Sn] which possess inherent acidity have been synthesized by sol-gel route whereas, 12-Tungstophosphoric acid (12-TPA) has been supported onto ZrO2, TiO2 and SnO2 resulting in 12-TPA/ZrO2, 12-TPA/TiO2 and 12-TPA/SnO2 which possesses induced acidity have been synthesized by process of anchoring and calcination. All the catalysts have been characterized for elemental analysis by ICP-AES, TGA, FTIR, SEM, EDX, XRD, surface area (by BET method) and surface acidity (by NH3-TPD method). The potential utility of these materials as solid acid catalysts have been explored by studying esterification as a model reaction wherein mono and diesters have been synthesized. The catalytic activity of synthesized materials has been compared and correlated with acid properties of the materials.

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