Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases p. 3767 - 3784 (1989)
Update date:2022-08-11
Topics:
Bond, Geoffrey C.
Gelsthorpe, Michael R.
The hydrogenolysis of propane, n-butane and isobutane on Pt/Al2O3 (0.3 and 0.6 percent Pt) and on Pt-Re/Al2O3 (0.3 percent Pt, 0.3 percent Re) has been investigated by a thermal cycling technique that permits evaluation of initial rates of deactivation and of consequential changes in product distributions.Less deactivation is found with propane than with the butanes; with n-butane on Pt/Al2O3 catalysts, two types of sites are apparent, one of which, having a higher probability of giving central C-C bond fission, is selectively deactivated.However, the relative chances of desorption and of further hydrogenolysis of the adsorbed intermediates are the same at both types of site.With the Pt-Re/Al2O3 catalyst, further bond-breaking in the adsorbed species formed from all three alkanes is relatively more favoured than with the Pt/Al2O3 catalysts, and with n-butane the chance of central bond-fission is enhanced.No changes in product distribution result from initial deactivation, which is comparable to that found with Pt/Al2O3 catalysts.Isomerisation of n-butane is slight (<3 percent) on all three catalysts.Multiply adsorbed species are suggested as possible intermediates, and differences in product selectivities are attributed chiefly to variations in electron density at the active site.
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