Stephen A. Butter

TL;DR: In this paper, a controlled reduction in the effective dimensions of the catalyst pore openings, and/or channels, along with deactivation of acidic surface sites, has been proposed as a mechanism for the selective production of p-xylene.

TL;DR: In this article, data were presented for para-selective and nonselective formation of xylenes from alkylation of toluene with methanol and disproportionation over ZSM-5 class zeolite catalysts.

TL;DR: Chang and Silvestri as discussed by the authors showed that methanol and/or its ether reacted on the phosphorus-modified ZSM-5 zeolite to yield ethylene as the primary products, probably via a methyl ethyl ether intermediate, followed by alkylation of the ethylene with methanoline or its ether to give an olefin with one additional carbon atom.

TL;DR: In this paper, a mechanism was proposed where oxides of these elements, present in the zeolites, reduce the dimensions of pore openings and channels sufficiently to favor formation and outward diffusion of p-xylene, the isomer with the smallest minimum dimension.

TL;DR: In this article, the authors discuss the process of converting alcohols, aliphatic mercap-tans and substituted aromatic rings to other desirable products by contacting such with a particular type of aluminosilicate molecular sieve catalyst at elevated temperature.