Abstract
Ceria-modification is an effective method for the deactivation of external acid sites of Hmordenite (HM). The selectivity of 2,6-diisopropynaphthalene (2,6-DIPN) in the isopropylation of naphthalene (NP) was enhanced by the modification with 10–50 wt-% of cerium without significant decrease of catalytic activity: the highest selectivity for 2,6-DIPN was up to 70% over HM (SiO 2 /Al 2 O 3 = 128) with 30 wt-% of cerium. The selectivity for 4,4′- diisopropylbiphenyl (4,4′-DIPB) in the isopropylation of biphenyl (BP) over HM decreased with reaction temperature because of the isomerization of 4,4′-DIPB. However, ceria-modification of HM was highly effective for the prevention of the isomerization. The enhancement of the selectivities of 2,6-DIPN and 4,4′-DIPB by ceria-modification is ascribed to the decrease of external acid sites which are active in non-regioselective alkylation and isomerization of products.
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