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Reactions of 13C-labeled alkanes show that chain growth and cyclization reactions on H−ZSM5 require the initial formation of the corresponding alkene and its extensive participation in rapid oligomerization/β-scission reactions before cyclization occurs. The role of alkene intermediates was established by the initial formation of predominantly unlabeled products from mixtures of propene and propane-2-13C reactants. Aromatic products of propane-2-13C reactions on H−ZSM5 contain similar fractions of 13C-atoms and binomial isotopomer distributions. Sequential formation, rapid intramolecular isomerization, and β-scission reactions of long surface chains must occur during each aromatization turnover in order to form such binomial 13C isotopomer distributions.

Isotopic Tracer Studies of Propane Reactions on H−ZSM5 Zeolite