Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases p. 3879 - 3890 (1989)
Update date:2022-08-17
Topics:
Halik, Christine
Chaudhuri, Satya N.
Lercher, Johannes A.
The catalytic properties of three SAPO5 samples for cracking of n-hexane and n-butane have been investigated.For characterization, both adsorption and temperature-programmed desorption of ammonia and pyridine were used.Only bridging hydroxyl groups (strong Broensted-acid sites) were found to be active for both reactions.The catalytic activities of these sites were the same for all samples investigated.Differences exist with respect to the accessibility of n-butane and n-hexane.The variations of the turnover frequencies suggest that n-butane was converted over all Broensted-acid sites present, whereas n-hexane was converted only over those sites that were able to adsorb pyridine.The product distribution and the apparent energies of activation suggest the prevalence of a monomolecular mechanism for cracking.As both molecules, n-butane and n-hexane, have nearly identical kinetic diameters, the transition state for n-hexane must be more bulky than that for n-butane.
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