An evaluation of polyethylene glycol as a catalyst in liquid-gas phase transfer catalysis: the base-catalyzed isomerization of allylbenzene

Ronny Neumann, Yoel Sasson

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7 Citations (Scopus)

Abstract

The gas-phase base-catalyzed isomerization of allylbenzene has been used as a model reaction to evaluate the activity of polyethylene glycol in liquid-gas phase transfer catalysis by-use of pulse reaction kinetics. Polyethylene glycol-potassium carbonate complexes adsorb the allylbenzene and reaction occurs at the catalyst interface. The activity of the catalyst is determined by two factors: the equilibrium of adsorption of the organic substrate and the solvation of the carbonate anion. We have found that polyethylene glycol adsorbs poorly vis-à-vis high surface area γ-alumina, and that solvation of the carbonate anion by the polyethylene glycol also reduces its activity. Carbonate anions impregnated on γ-alumina are not solvated and therefore have high activity.

Original languageEnglish
Pages (from-to)201-208
Number of pages8
JournalJournal of Molecular Catalysis
Volume33
Issue number2
DOIs
Publication statusPublished - 1985

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Isomerization
Catalysis
Polyethylene glycols
Carbonates
Catalysts
Negative ions
Solvation
Liquids
Gases
Alumina
Potash
Reaction kinetics
Catalyst activity
Adsorption
Substrates

ASJC Scopus subject areas

  • Engineering(all)

Cite this

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title = "An evaluation of polyethylene glycol as a catalyst in liquid-gas phase transfer catalysis: the base-catalyzed isomerization of allylbenzene",
abstract = "The gas-phase base-catalyzed isomerization of allylbenzene has been used as a model reaction to evaluate the activity of polyethylene glycol in liquid-gas phase transfer catalysis by-use of pulse reaction kinetics. Polyethylene glycol-potassium carbonate complexes adsorb the allylbenzene and reaction occurs at the catalyst interface. The activity of the catalyst is determined by two factors: the equilibrium of adsorption of the organic substrate and the solvation of the carbonate anion. We have found that polyethylene glycol adsorbs poorly vis-{\`a}-vis high surface area γ-alumina, and that solvation of the carbonate anion by the polyethylene glycol also reduces its activity. Carbonate anions impregnated on γ-alumina are not solvated and therefore have high activity.",
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T2 - the base-catalyzed isomerization of allylbenzene

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AU - Sasson, Yoel

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N2 - The gas-phase base-catalyzed isomerization of allylbenzene has been used as a model reaction to evaluate the activity of polyethylene glycol in liquid-gas phase transfer catalysis by-use of pulse reaction kinetics. Polyethylene glycol-potassium carbonate complexes adsorb the allylbenzene and reaction occurs at the catalyst interface. The activity of the catalyst is determined by two factors: the equilibrium of adsorption of the organic substrate and the solvation of the carbonate anion. We have found that polyethylene glycol adsorbs poorly vis-à-vis high surface area γ-alumina, and that solvation of the carbonate anion by the polyethylene glycol also reduces its activity. Carbonate anions impregnated on γ-alumina are not solvated and therefore have high activity.

AB - The gas-phase base-catalyzed isomerization of allylbenzene has been used as a model reaction to evaluate the activity of polyethylene glycol in liquid-gas phase transfer catalysis by-use of pulse reaction kinetics. Polyethylene glycol-potassium carbonate complexes adsorb the allylbenzene and reaction occurs at the catalyst interface. The activity of the catalyst is determined by two factors: the equilibrium of adsorption of the organic substrate and the solvation of the carbonate anion. We have found that polyethylene glycol adsorbs poorly vis-à-vis high surface area γ-alumina, and that solvation of the carbonate anion by the polyethylene glycol also reduces its activity. Carbonate anions impregnated on γ-alumina are not solvated and therefore have high activity.

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