Highly selective synthesis of 2,6-bis(4-methylphenyl)pyridine over novel mesoporous solid acid catalysts

M. Selvaraj, T. G. Lee

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Aminocyclization reaction of 4-methyl acetophenone (4-MAP) with formaldehyde and ammonia was contacted under vapor phase reaction conditions over novel mesoporous Zn-Al-MCM-41 catalysts with different Si/(Zn + Al) ratios for highly selective synthesis of 2,6-BP (2,6-bis(4-methylphenyl)pyridine). For the reactions, the influences of various reaction parameters such as different catalysts, reaction temperature, reactant molar ratio, WHSV, TOS and recyclability are discussed. With increasing the Si/(Zn + Al) ratios of Zn-Al-MCM-41 catalysts from 75 to 380, the conversion of 4-methyl acetophenone (4-MAP), and the yield and selectivity of 2,6-BP decreased because the number of Brønsted acid sites in Zn-Al-MCM-41 catalysts is found to decrease almost linearly with increasing ratios of Si/(Zn + Al). Further the catalytic results were compared with those obtained by using Al-MCM-41, HY, Hβ, HM and H-ZSM-5 zeolites. The conversion and selectivity is increased in Zn-Al-MCM-41(21) with each cycling of reaction because its catalytic activity does not change. The Si/(Zn + Al) ratio of 21 is found to be more suitable for the aminocyclization reaction of 4-MAP to highly selective synthesis of 2,6-BP. Thus the selectivity of 2,6-BP is higher in Zn-Al-MCM-41(21) than that in other Zn-Al-MCM-41, Al-MCM-41, HY, Hβ, HM and H-ZSM-5.

Original languageEnglish
Pages (from-to)52-58
Number of pages7
JournalMicroporous and Mesoporous Materials
Volume85
Issue number1-2
DOIs
Publication statusPublished - 2005 Oct 23

All Science Journal Classification (ASJC) codes

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

Fingerprint Dive into the research topics of 'Highly selective synthesis of 2,6-bis(4-methylphenyl)pyridine over novel mesoporous solid acid catalysts'. Together they form a unique fingerprint.

  • Cite this