CATALYST DEACTIVATION IN DECOMPOSITION OF p -SUBSTITUTED- t -BUTYLBENZENES OVER SILICA-ALUMINA CATALYST

Publisher Website
Google Scholar
Abstract
The vapor phase de-t-butylation of p-alkylaled-t-butylbenzenes, p-halogenated-t-butylbenzenes and p-t-butylanisole were carried out over a commercially obtained silica-alumina catalyst. The surface area of the catalyst and the quantity of pyridine chemisorbed by the catalyst were also measured to obtain the information about the catalyst deactivation. Most of the substituted t-butylbenzenes decomposed to the corresponding substituted-benzene, but p-t-butylcumene and t-butylbromobenzene reacted to the products via complicated networks. In the decomposition of p-alkylated-t-butylbenzenes, the deactivation coefficients tended to be proportional to the reaction rates, that is, the activity of the catalyst decreased with increasing the rate constants. The introduction of halogeno group to t-butylbenzene caused to decrease the rate of de-t-butylalion. The surface area of the catalyst diminished in progress of the reaction, but the diminishment up to 8% was not responsible for the deactivation. The acid site, especially having relatively strong acid strength, decreased in the order of the deactivation coefficients.

This publication has 3 references indexed in Scilit: