Liquid-phase reaction of 2 '-hydroxyacetophenone and benzaldehyde over SO3H-SBA-15 catalysts: Influence of microwave and thermal effects

Saravanamurugan Shunmugavel, Sujandi Sujandi, Eko Adi Prasetyanto, Sang-Eon Park

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The influence of both microwave and thermal effects has been investigated for sulfonic acid functionalized SBA-15 catalysts synthesized by direct, prehydrolysis and post synthetic approaches under microwave and hydrothermal conditions. The XRD patterns revealed that the catalysts synthesized under microwave offered hexagonal type where as catalysts synthesized under hydrothermal offered cubic Ia3d as well as hexagonal type mesoporous silica. FTIR spectra indicated that the thiol groups were completely converted to sulfonic acid groups. The sulfonic acid functionalized SBA-15 catalysts were applied to the liquid-phase reaction of 2'-hydroxyacetophenone and benzaldellyde in the absence of solvent under both microwave and thermal reaction. In the case of microwave catalysts, the microwave reaction gave higher conversion of 2'-hydroxyacetophenone with higher selectivity to substituted flavanone than thermal reaction due to the strong absorption of microwave. The prehydrolysis period of the catalysts increased with decreasing the conversion of 2'-hydroxyacetophenone. It was due to the non-uniform dispersion of functional groups as well as transport limitations of bulky products such as T-hydroxychalcone, flavanone and substituted flavanone. (C) 2007 Elsevier Inc. All rights reserved.
Original languageEnglish
JournalMicroporous and Mesoporous Materials
Volume112
Issue number1-3
Pages (from-to)97-107
ISSN1387-1811
DOIs
Publication statusPublished - 2008
Externally publishedYes

Keywords

  • Aldehydes
  • Catalysts
  • Hydrolysis
  • Mesoporous materials
  • Thermal effects
  • Ketones
  • Flavanone
  • Mesoporous silica
  • 2′-Hydroxychalcone
  • Microwave
  • SO3H-SBA-15
  • Thermal
  • T
  • X
  • CHEMISTRY,
  • NANOSCIENCE
  • MATERIALS
  • MESOPOROUS MOLECULAR-SIEVES
  • ALUMINOSILICATE MCM-41
  • BASE CATALYSTS
  • CONDENSATION
  • FLAVONOIDS
  • STABILITY
  • SILICA
  • COMPOSITES
  • CHALCONES
  • SYSTEMS
  • microwave
  • thermal
  • 2 '-hydroxychalcone
  • flavanone

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