SYNTHESIS OF DIISOPROPYLBENZENE OVER DEALUMINATED ZEOLITE-BETA

Zeolite beta was used for isopropylation of cumene to diisopropylbenze nes. This zeolite deactivated with increase in time-on-stream period. To overcome the catalyst deactivation during reaction, two different s tabilization methods viz. steaming and treatment with (NH4)2SiF6 were examined. A combination of these two methods resulted in obtaining a s teady stable catalytic performance during alkylation. The effects of v arious reaction conditions on the activity/selectivity behaviour of th e stabilized zeolite have been studied.