Effect of partial poisoning of acid sites on selectivity in the multiple reactions of mono‐substituted‐t‐Butylbenzenes

Abstract

The decomposition reaction of p–t‐butylcumene and t‐butylbromobenzene have been carried out over pyridine poisoned silica‐alumina and HY zeolite in order to examine the effect of acid strength on selectivity. Since the catalyst deactivation rate for isomerization over the poisoned silica‐alumina was greater than that of de‐t‐butylation in the reaction of p–t‐butylcumene, the selectivity of de‐t‐butylation gradually improved with process time. In the reaction of t‐butylbromobenzene over poisoned HY zeolite, the de‐bromination rate was suppressed by the poisoning because the nature of active sites was different between silica‐alumina and HY zeolite. The poisoned HY zeolite was found to be favorable for the de‐t‐butylation of halogenated‐t‐butylbenzenes.