Shape-selective isopropylation of naphthalene over hydrogen-mordenite catalysts - Effect of mordenite dealumination

Chunshan Song, Andrew D. Schmitz

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9 Citations (Scopus)

Abstract

Mordenite-catalyzed shape-selective naphthalene isopropylation to produce 2,6-diisopropylnaphthalene (2,6-DIPN) was studied. Effects of dealumination of mordenite on the structural and acidic characteristics and on the shape selectivity and activity were examined by physico-chemical analysis, TPD, NMR, XRD, and catalytic alkylation reactions. Dealumination removes octahedral and tetrahedral Al species, decreases the unit cell dimensions, and reduces the number of strong acid sites in mordenites. Proper dealumination can improve selectivity to 2,6-DIPN from 33 to 61% and significantly increases 2,6-DIPN/2,7-DIPN ratio. Improved selectivity to 2,6-DIPN upon proper dealumination was attributed to decrease in mordenite acidity, reduction in unit cell dimension, and removal of some strong acid sites. However, neither the change in selectivity nor that in activity is a simple function of dealumination degree or SiO2/Al2O3 ratio. Some minor difference in the apparent framework SiO2/Al2O3 ratio can result in major difference in activity or selectivity.

Original languageEnglish (US)
Pages (from-to)287-298
Number of pages12
JournalSekiyu Gakkaishi (Journal of the Japan Petroleum Institute)
Volume42
Issue number5
DOIs
StatePublished - Jan 1 1999

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Naphthalene
Hydrogen
Catalysts
Acids
Alkylation
Temperature programmed desorption
Acidity
Nuclear magnetic resonance
Chemical analysis

All Science Journal Classification (ASJC) codes

  • Fuel Technology
  • Energy Engineering and Power Technology

Cite this

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abstract = "Mordenite-catalyzed shape-selective naphthalene isopropylation to produce 2,6-diisopropylnaphthalene (2,6-DIPN) was studied. Effects of dealumination of mordenite on the structural and acidic characteristics and on the shape selectivity and activity were examined by physico-chemical analysis, TPD, NMR, XRD, and catalytic alkylation reactions. Dealumination removes octahedral and tetrahedral Al species, decreases the unit cell dimensions, and reduces the number of strong acid sites in mordenites. Proper dealumination can improve selectivity to 2,6-DIPN from 33 to 61{\%} and significantly increases 2,6-DIPN/2,7-DIPN ratio. Improved selectivity to 2,6-DIPN upon proper dealumination was attributed to decrease in mordenite acidity, reduction in unit cell dimension, and removal of some strong acid sites. However, neither the change in selectivity nor that in activity is a simple function of dealumination degree or SiO2/Al2O3 ratio. Some minor difference in the apparent framework SiO2/Al2O3 ratio can result in major difference in activity or selectivity.",
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N2 - Mordenite-catalyzed shape-selective naphthalene isopropylation to produce 2,6-diisopropylnaphthalene (2,6-DIPN) was studied. Effects of dealumination of mordenite on the structural and acidic characteristics and on the shape selectivity and activity were examined by physico-chemical analysis, TPD, NMR, XRD, and catalytic alkylation reactions. Dealumination removes octahedral and tetrahedral Al species, decreases the unit cell dimensions, and reduces the number of strong acid sites in mordenites. Proper dealumination can improve selectivity to 2,6-DIPN from 33 to 61% and significantly increases 2,6-DIPN/2,7-DIPN ratio. Improved selectivity to 2,6-DIPN upon proper dealumination was attributed to decrease in mordenite acidity, reduction in unit cell dimension, and removal of some strong acid sites. However, neither the change in selectivity nor that in activity is a simple function of dealumination degree or SiO2/Al2O3 ratio. Some minor difference in the apparent framework SiO2/Al2O3 ratio can result in major difference in activity or selectivity.

AB - Mordenite-catalyzed shape-selective naphthalene isopropylation to produce 2,6-diisopropylnaphthalene (2,6-DIPN) was studied. Effects of dealumination of mordenite on the structural and acidic characteristics and on the shape selectivity and activity were examined by physico-chemical analysis, TPD, NMR, XRD, and catalytic alkylation reactions. Dealumination removes octahedral and tetrahedral Al species, decreases the unit cell dimensions, and reduces the number of strong acid sites in mordenites. Proper dealumination can improve selectivity to 2,6-DIPN from 33 to 61% and significantly increases 2,6-DIPN/2,7-DIPN ratio. Improved selectivity to 2,6-DIPN upon proper dealumination was attributed to decrease in mordenite acidity, reduction in unit cell dimension, and removal of some strong acid sites. However, neither the change in selectivity nor that in activity is a simple function of dealumination degree or SiO2/Al2O3 ratio. Some minor difference in the apparent framework SiO2/Al2O3 ratio can result in major difference in activity or selectivity.

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