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 language||English (US)|
|Number of pages||12|
|Journal||Sekiyu Gakkaishi (Journal of the Japan Petroleum Institute)|
|State||Published - Sep 1999|
All Science Journal Classification (ASJC) codes
- Fuel Technology
- Energy Engineering and Power Technology