Abstract
Coke formation over a series of dealuminated mordenites was investigated by in-situ IR spectroscopy using dealkylation/disproportionation of ethylbenzene as a model reaction. The rates of coke formation and catalyst deactivation increased with increasing acidity, i.e. number and/or strength of the acidic sites. Comparison of deactivation by ethylbenzene and ethylene reaction suggested that deactivation during conversion of ethylbenzene is more likely due to partial pore blocking than to poisoning or consumption of active OH groups. Sensitivity to coke formation and increase of selectivity for para-diethylbenzene with increasing coke deposition seemed to be correlated to an increase in acid strength of the active centres.
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