C NMR spectroscopy and computer simulations have shown that the chain length of hydrocarbons has a surprising effect on where these molecules reside in the zeolite FER. Propane and butane can access the entire two-dimensional channel structure, while hexane only the one-dimensional substructure. This difference has important consequences for the catalytic activity and explains some of the experimental observations.
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Well et al. (1998) studied this question.
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