Abstract
Selective disproportionation of ethylbenzene, yielding benzene and diethylbenzenes in the ratio 1 : 1, was carried out in a micro flow reactor over various faujasite-type zeolites, hydrogen L zeolite and hydrogen ZSM-5. Ethylbenzene disproportionation occurs without any catalyst deactivation. The reaction rate depends on the Brönsted acidity of the zeolite catalysts as measured by i.r. spectroscopy. It is concluded from the acid strength distribution of HNa-Y, BeNa-Y, MgNa-Y, CaNa-Y, SrNa-Y and BaNa-Y, which was determined via butylamine titration, that only very strong Brönsted acid sites (H 0 ⩽ −8.2, H R ⩽ −13.3) are capable of catalysing the disproportionation of ethylbenzene.
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