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Isotopic Tracer Studies of Propane Reactions on H−ZSM5 Zeolite

Joseph A. BiscardiDepartment of Chemical Engineering, University of California at Berkeley, Berkeley, California 94720Enrique IglesiaDepartment of Chemical Engineering, University of California at Berkeley, Berkeley, California 94720

1998en

ABI

Annotatsiya

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.

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Identifikatorlar

DOI: 10.1021/jp9824860

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