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

M. Selvaraj, Tai Gyu 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

Fingerprint

Multicarrier modulation
Pyridine
pyridines
catalysts
acids
Catalysts
Acids
synthesis
selectivity
Zeolites
pyridine
MCM-41
formaldehyde
zeolites
catalytic activity
ammonia
Ammonia
Formaldehyde
Catalyst activity
vapor phases

All Science Journal Classification (ASJC) codes

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

Cite this

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title = "Highly selective synthesis of 2,6-bis(4-methylphenyl)pyridine over novel mesoporous solid acid catalysts",
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 Br{\o}nsted 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.",
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Highly selective synthesis of 2,6-bis(4-methylphenyl)pyridine over novel mesoporous solid acid catalysts. / Selvaraj, M.; Lee, Tai Gyu.

In: Microporous and Mesoporous Materials, Vol. 85, No. 1-2, 23.10.2005, p. 52-58.

Research output: Contribution to journalArticle

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T1 - Highly selective synthesis of 2,6-bis(4-methylphenyl)pyridine over novel mesoporous solid acid catalysts

AU - Selvaraj, M.

AU - Lee, Tai Gyu

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AB - 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.

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