Baldev Singh, Jyoti Patial, Parveen Sharma
Apr 2, 2007
Citations
1
Influential Citations
36
Citations
Journal
Journal of Molecular Catalysis A-chemical
Abstract
Abstract Isolongifolene and various other isolongifolene-based products are commercially important chemicals that find applications in perfumery and fragrance industry. These important commodity chemicals are generally prepared by homogeneous catalyzed reactions of longifolene in liquid phase. In the present study, role of acidity and acid distribution on montmorillonite, pillared interlayered clay and modified pillared clay catalysts have been studied for the first time in vapor phase system for the conversion of longifolene to isolongifolene. The number and strength of acid sites of montmorillonite clay mineral have been modified by steps of synthesis and by cations selection. Reaction of Al- pillared montmorillonite with Ru 3+ yielded a catalyst with significantly higher distribution of weak acid sites while fortification of montmorillonite with Ce 3+ and La 3+ had little effect on total acidity and its distribution. In the present study, an attempt has been made to correlate the activity of the catalysts with total acidity, number and strength of the acid for the conversion of longifolene to isolongifolene. NH 3 TPD determined the concentration and strength of acid sites.