Tert-butylation of phenol over H beta, HY, HZSM-5 and HAlMCM-41
Studies in Surface Science and Catalysis(2007)
Abstract
Tert-butylation of phenol with different alkylating agents, i.e., iso-butylene, MTBE and tert-butyl alcohol (TBA), was studied over various molecular sieve catalysts. It revealed that the reactivity followed the order of H beta > HY > HZSM-5 approximate to HAlMCM-41 in the catalysts and of iso-butylene > MTBE > TBA in the alkylating agents. The selectivity of the product depended not only on the nature of the catalysts but also on the reaction conditions. p-TBP is a more favorable primary product than o-TBP owing to its less steric hindrance in the transition state, and the amount of o-TBP is always trace in the product. o-TBP may play a less important role than p-TBP in the formation of 2,4-DTBP.
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