Issue 2, 1983

Alkylation reactions over ion-exchanged molecular sieve zeolite catalysts. Part 1.—Alkylation of toluene with methanol: consideration of the effects of reaction parameters on catalyst deactivation and the extent of polysubstitution

Abstract

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 associated with the formation of tri- or tetra-methylbenzenes to a greater or lesser extent over the partially deactivated catalysts; (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.

Article information

Article type
Paper

J. Chem. Soc., Faraday Trans. 1, 1983,79, 281-296

Alkylation reactions over ion-exchanged molecular sieve zeolite catalysts. Part 1.—Alkylation of toluene with methanol: consideration of the effects of reaction parameters on catalyst deactivation and the extent of polysubstitution

B. Coughlan, W. M. Carroll and J. Nunan, J. Chem. Soc., Faraday Trans. 1, 1983, 79, 281 DOI: 10.1039/F19837900281

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Spotlight

Advertisements