Shape-selective alkylation of naphthalene with isopropanol over large pore zeolites

Para-selective tert-butylation of phenol over nano sulfated titania catalysts prepared via sol-gel route

“…However, the reaction or tertiary butylation of phenol gives numerous products depending on the nature of the catalyst as well as on the reaction temperature. Generally, in the alkylation of aromatics using catalytic activity was controlled by acidity and selectivity was controlled by pore structure and acid strength of zeolites [7][8][9][10][11]. Sakthivel et al had reported the vapour phase tertiary butylation of phenol over sulfated zirconia catalyst with a high selectivity to para isomer [12].…”

Isopropylation of naphthalene over modified-mordenite zeolites

“…Therefore, besides 2,6-DAN, more than 10 isomers are formed simultaneously. Selective alkylation of polynuclear aromatics has only received limited attention [1,2], despite the fact that zeolites have been investigated extensively with respect to alkylation of aromatics. Fraenkel et al [3,4] demonstrated the nonselective methylation of naphthalene and 2-methyinaphthalene over Hmordenite and HY zeolites, whereas a high l-selectivity was obtained over HZSM-5 zeolite.…”

Unusual results in the liquid phase alkylation of naphthalene with isopropyl alcohol over zeolite H-beta

“…Owing to the steric hindrance of naphthalene, medium pore zeolites, such as HZSM-5, show moderate activity in naphthalene alkylation. 4,5 Large pore zeolites, such as Mordenite, beta, Y, and more recently mesoporous aluminosilicates, have been investigated. Alkylating agents bulkier than MeOH, such as isopropyl [5][6][7][8][9] or cyclohexyl derivatives 7,10 and butanol, 11,12 have been also applied successfully to the selective formation of 2,6-dialkylnaphthalenes.…”

“…4,5 Large pore zeolites, such as Mordenite, beta, Y, and more recently mesoporous aluminosilicates, have been investigated. Alkylating agents bulkier than MeOH, such as isopropyl [5][6][7][8][9] or cyclohexyl derivatives 7,10 and butanol, 11,12 have been also applied successfully to the selective formation of 2,6-dialkylnaphthalenes. Among these studies, substantial advances have been made in naphthalene isopropylation for both the understanding of the alkylation mechanism and the design of catalysts leading to high selectivity in forming 2,6-diisopropylnaphthalenes.…”

“…Among these studies, substantial advances have been made in naphthalene isopropylation for both the understanding of the alkylation mechanism and the design of catalysts leading to high selectivity in forming 2,6-diisopropylnaphthalenes. [5][6][7][8][9] H-beta has been shown to be more active and selective than HY in the alkylation of benzene with propylene 13 but did not demonstrate selectivity in the alkylation of polyaromatics until recently. 5,9,11,12 Nevertheless, it has been reported that H-beta shows an unexpected high selectivity for sec-butylbenzene in the alkylation of benzene with isobutyl alcohol.…”