Highly selective synthesis of trans-stilbene oxide over mesoporous Mn-MCM-41 and Zr-Mn-MCM-41 molecular sieves

M. Selvaraj, K. S. Seshadri, A. Pandurangan, T. G. Lee

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Abstract

trans-Stilbene oxide have been synthesized under liquid phase reaction conditions using trans-stilbene in the presence of different oxidants and different solvents over synthesized and characterized Zr-Mn-MCM-41 and Mn-MCM-41 as catalysts. On increasing the Si/(Zr + Mn) ratios of Zr-Mn-MCM-41 and Si/Mn ratios of Mn-MCM-41 catalysts from 49 to 327 and 15 to 102, respectively, the conversion of trans-stilbene, yield and selectivity of trans-stilbene oxide decreased. This may be due to the number of Lewis acid sites in Zr-Mn-MCM-41 and Mn-MCM-41 are found to decrease almost linearly with increasing ratios of Si/(Zr + Mn) and Si/Mn, respectively. Both the Zr-Mn-MCM-41(49) and Mn-MCM-41(31) possesses stronger affinity with trans-stilbene and TBHP, but, the conversion of trans-stilbene, yield and selectivity of trans-stilbene oxide decreased in only recyclable Mn-MCM-41. This may be due to decreasing the catalytic activity on the surface of catalysts. In the context, the Si/(Zr + Mn) ratio of 49 is found to be more suitable for the epoxidation of trans-stilbene to highly selective synthesis of trans-stilbene oxide. Thus the yield (76.3%) and selectivity of trans-stilbene oxide (84.58%) are higher in Zr-Mn-MCM-41(49) than that in other Zr-Mn-MCM-41 and Mn-MCM-41 catalysts.

Original languageEnglish
Pages (from-to)261-268
Number of pages8
JournalMicroporous and Mesoporous Materials
Volume79
Issue number1-3
DOIs
Publication statusPublished - 2005 Apr 1

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials

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