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Abstract
Greatly increased yields of aromatics were obtainied in the reaction of ethanol over ZSM-5 zeolites if the protonated catalyst was pretreated in aqueous mineral acids or if hydrogen choloride or dichloroethane was added to the feed. The treated catalysts apparently contained less sodium than the ammonium-exchanged catalysts, and in some cases, some alumimum was removed. The product distributions at > 95% conversion were, e.g., 2% by wt benzene, 12% toluene, 24% xylenes, 34% trimethylbenzene, and 11% C/sub 10/+ aromatics from a catalyst treated in 0.6 M nitric acid, and 3% xylenes and 92% C/sub 10/+ aromatics from a catalyst treated in hydrofluoric acid.
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