Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases p. 281 - 296 (1983)
Update date:2022-08-11
Topics:
Coughlan, Brendan
Carroll, William M.
Nunan, John
The alkylation of toluene with methanol under non-isomerizing conditions has been studied over a range of ion-exchanged zeolite catalysts.Rapid deactivation with increasing time on stream was observed in the case of LaY and NH4Y catalysts, whereas a NiY and a range of Ni,SnY samples manifested a high steady-state activity; the catalytic activity at the steady state could be related to the chemical composition of these latter samples.Catalyst deactivation was always associated with the formation of polysubstituted products.From a detailed study of the systems at the steady state it was concluded that (i) methylation of toluene is always a ssociated with the formation of tri- or tetra-methylbenzenes to a greater or lesser extent over the partially deactived catlysts; (ii) the origin of the polymethylated products is a weakly adsorbed o-xylene species: (iii) the selectivity towards polysubstitution varies with time on stream.This results from a change in the strength of interaction between the xylenes and the catalyst surface as shown by studies of the heats of immersion of the catalysts.
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