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Combinations of 14C labeled or unlabeled methanol and unlabeled or 14C labeled ethene or propene have been converted to hydrocarbons using a ZSM-5 catalyst. The relative 14C in the hydrocarbon products document that the alkylation of C3"1 11" alkenes is more rapid than the formation of these products from only methanol. Carbon isotope equilibration occurs by a combination of alkene oligomerization and cracking. Ethene participates in isotopic equilibration more slowly than C3"1" alkenes. For the low aluminum ZSM-5 catalyst, the acid site density is low enough so that carbon isotope equilibration, which obscures any mechanistic information for high aluminum ZSM-5, is slow enough that reliable kinetic data can be obtained.

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