Mechanism of the aromatization of n-hexane on alumina-platinum catalysts with additions of cadmium and rhenium
The influence of additions of Re and Cd to an alumina-platinum catalyst on the mechanism of the aromatization reaction has been studied with the aid of the kinetic isotope method.
The formation of benzene from hexane on alumina-platinum catalysts with addition of Re and Cd takes place with the participation both of hexene and of methylcyclopentane. Cyclohexane is not formed under the reaction conditions.
Additions of Re and Cd do not appreciably change the routes of the aromatization of n-hexane. The addition of Cd somewhat inhibits the reactions taking place on the acidic centers of the catalyst-in particular, the dehydroisomerization of five-membered rings to aromatic systems. Consequently, the introduction of Re and Cd somewhat changes the relative roles of each of the routes mentioned in the overall benzene-forming process.
On alumina-platinum catalysts, hexenes participate not only in aromatization but also in the C5-dehydrocyclization reaction, the contributions of the hexenes to the two reactions being comparable.
KeywordsBenzene Cadmium Hexenes Cyclohexane Rhenium
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