Room temperature synthesis of diphenylmethane over novel mesoporous Lewis acid catalysts

M. Selvaraj, Tai Gyu Lee

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Highly selective synthesis of diphenylmethane (DPM) was carried out by Friedal-Crafts benzylation of benzene using benzyl chloride (BC) as alkylating agent in the presence of a flow of nitrogen under liquid phase reaction conditions over novel mesoporous SO42-/Al-MCM-41 catalysts with different Si/Al ratios. For these reactions, the influences of various reaction parameters, such as different catalysts, reaction temperature, time, mmol ratios of reactants and recyclability are discussed. With increasing the Si/Al ratios of SO42-/Al-MCM-41 catalysts from 21 to 83, the conversion of BC and selectivity of DPM decreased because the number of Lewis acid sites in SO42-/Al-MCM-41 catalysts are found to decrease almost linearly with increasing ratios of Si/Al. Further the catalytic results were compared with those obtained by using 0.8N sulfuric acid, different Si/Al ratios of Al-MCM-41, HY, Hβ, HM and H-ZSM-5 zeolites. From the comparison of the results, SO42-/Al-MCM-41(21) is found to be a highly active and recyclable heterogeneous catalyst for the highly selective synthesis of DPM. Thus, the selectivity of DPM in SO 42-/Al-MCM-41(21) is higher than that in other SO 42-/Al-MCM-41 (Si/Al = 42 and 83), Al-MCM-41 (Si/Al = 21, 42 and 83), HY, Hβ, HM and H-ZSM-5.

Original languageEnglish
Pages (from-to)176-182
Number of pages7
JournalJournal of Molecular Catalysis A: Chemical
Volume243
Issue number2
DOIs
Publication statusPublished - 2006 Jan 16

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Lewis Acids
Multicarrier modulation
catalysts
acids
Catalysts
Acids
room temperature
synthesis
Temperature
selectivity
chlorides
sulfuric acid
zeolites
vehicles
Zeolites
liquid phases
benzene
diphenylmethane
MCM-41
Alkylating Agents

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Process Chemistry and Technology
  • Physical and Theoretical Chemistry

Cite this

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title = "Room temperature synthesis of diphenylmethane over novel mesoporous Lewis acid catalysts",
abstract = "Highly selective synthesis of diphenylmethane (DPM) was carried out by Friedal-Crafts benzylation of benzene using benzyl chloride (BC) as alkylating agent in the presence of a flow of nitrogen under liquid phase reaction conditions over novel mesoporous SO42-/Al-MCM-41 catalysts with different Si/Al ratios. For these reactions, the influences of various reaction parameters, such as different catalysts, reaction temperature, time, mmol ratios of reactants and recyclability are discussed. With increasing the Si/Al ratios of SO42-/Al-MCM-41 catalysts from 21 to 83, the conversion of BC and selectivity of DPM decreased because the number of Lewis acid sites in SO42-/Al-MCM-41 catalysts are found to decrease almost linearly with increasing ratios of Si/Al. Further the catalytic results were compared with those obtained by using 0.8N sulfuric acid, different Si/Al ratios of Al-MCM-41, HY, Hβ, HM and H-ZSM-5 zeolites. From the comparison of the results, SO42-/Al-MCM-41(21) is found to be a highly active and recyclable heterogeneous catalyst for the highly selective synthesis of DPM. Thus, the selectivity of DPM in SO 42-/Al-MCM-41(21) is higher than that in other SO 42-/Al-MCM-41 (Si/Al = 42 and 83), Al-MCM-41 (Si/Al = 21, 42 and 83), HY, Hβ, HM and H-ZSM-5.",
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Room temperature synthesis of diphenylmethane over novel mesoporous Lewis acid catalysts. / Selvaraj, M.; Lee, Tai Gyu.

In: Journal of Molecular Catalysis A: Chemical, Vol. 243, No. 2, 16.01.2006, p. 176-182.

Research output: Contribution to journalArticle

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AB - Highly selective synthesis of diphenylmethane (DPM) was carried out by Friedal-Crafts benzylation of benzene using benzyl chloride (BC) as alkylating agent in the presence of a flow of nitrogen under liquid phase reaction conditions over novel mesoporous SO42-/Al-MCM-41 catalysts with different Si/Al ratios. For these reactions, the influences of various reaction parameters, such as different catalysts, reaction temperature, time, mmol ratios of reactants and recyclability are discussed. With increasing the Si/Al ratios of SO42-/Al-MCM-41 catalysts from 21 to 83, the conversion of BC and selectivity of DPM decreased because the number of Lewis acid sites in SO42-/Al-MCM-41 catalysts are found to decrease almost linearly with increasing ratios of Si/Al. Further the catalytic results were compared with those obtained by using 0.8N sulfuric acid, different Si/Al ratios of Al-MCM-41, HY, Hβ, HM and H-ZSM-5 zeolites. From the comparison of the results, SO42-/Al-MCM-41(21) is found to be a highly active and recyclable heterogeneous catalyst for the highly selective synthesis of DPM. Thus, the selectivity of DPM in SO 42-/Al-MCM-41(21) is higher than that in other SO 42-/Al-MCM-41 (Si/Al = 42 and 83), Al-MCM-41 (Si/Al = 21, 42 and 83), HY, Hβ, HM and H-ZSM-5.

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