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Perlite Supported Cobalt Oxide Catalyst for a Series of Liquid‐Phase Esterification Reactions

Perlite Supported Cobalt Oxide Catalyst for a Series of Liquid‐Phase Esterification Reactions Thermally activated perlite‐supported cobalt oxide (Co‐TAP) catalyst has been synthesized via the deposition‐precipitation method. FTIR peaks at around 663 and 565 cm–1 and XRD peaks arise from diffraction of FCC planes of CoO crystals confirm the presence of Co3O4 crystallites on Co‐TAP surface. UV–Vis DRS studies reveal the presence of octahedrally coordinated Co3+ and tetrahedrally coordinated Co2+ ions. EDX analysis of Co‐TAP clearly shows the enhanced percentage of silica and cobalt oxide. All characterization studies suggest the presence of Lewis acidic sites on Co‐TAP which have been utilized in a series of liquid‐phase esterification reactions of benzoic acid with various alcohols over three different reaction media (conventional, microwave, and sonication). The reactions are carried out in one‐pot, single‐step, solvent‐free reaction conditions, and the catalyst is filtered easily, regenerated, and reused up to five reaction cycles with analogous efficiency suggesting that acidic sites of the catalyst remain stable in all reaction mediums. The stability of regenerated Co‐TAP catalyst after the fifth reaction cycle is confirmed by FTIR spectrum which resembles the FTIR of fresh catalyst. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Macromolecular Symposia Wiley

Perlite Supported Cobalt Oxide Catalyst for a Series of Liquid‐Phase Esterification Reactions

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References (29)

Publisher
Wiley
Copyright
© 2022 Wiley‐VCH GmbH
ISSN
1022-1360
eISSN
1521-3900
DOI
10.1002/masy.202100369
Publisher site
See Article on Publisher Site

Abstract

Thermally activated perlite‐supported cobalt oxide (Co‐TAP) catalyst has been synthesized via the deposition‐precipitation method. FTIR peaks at around 663 and 565 cm–1 and XRD peaks arise from diffraction of FCC planes of CoO crystals confirm the presence of Co3O4 crystallites on Co‐TAP surface. UV–Vis DRS studies reveal the presence of octahedrally coordinated Co3+ and tetrahedrally coordinated Co2+ ions. EDX analysis of Co‐TAP clearly shows the enhanced percentage of silica and cobalt oxide. All characterization studies suggest the presence of Lewis acidic sites on Co‐TAP which have been utilized in a series of liquid‐phase esterification reactions of benzoic acid with various alcohols over three different reaction media (conventional, microwave, and sonication). The reactions are carried out in one‐pot, single‐step, solvent‐free reaction conditions, and the catalyst is filtered easily, regenerated, and reused up to five reaction cycles with analogous efficiency suggesting that acidic sites of the catalyst remain stable in all reaction mediums. The stability of regenerated Co‐TAP catalyst after the fifth reaction cycle is confirmed by FTIR spectrum which resembles the FTIR of fresh catalyst.

Journal

Macromolecular SymposiaWiley

Published: Apr 1, 2022

Keywords: microwave‐assisted esterification; perlite; sonication; UV–Vis DRS; XRD

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