In the present work, the cracking and isomerization of methylcyclohexane on a partially exchanged NaHY zeolite has been studied in the presence of H2 and N2, at atmospheric pressure and 350, 400 and 450 °C. Hydrogen has a negative influence on the reaction rates for the two reactions, while activation energies remain unaffected. A possible mechanism for the interaction of H2 with carbocations has been studied by molecular orbital calculations, and it has been found that H2 can inhibit these reactions by formation of a complex [carbocation-H2].
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