Abstract
The adsorption and isomerization of n-butenes on tin-antimony oxide catalysts have been studied by 13C-NMR spectroscopy. From linewidths and intensity variations with temperature, the nature of the adsorbed species was assessed: a cyclic complex describes the low-temperature adsorption (<240 K) and at higher temperature (>240 K) a contact-type complex accounts better for the interaction between the admolecule and the surface. A cyclic complex-like intermediate occurs probably on the reaction path for the double-bond shift and the geometric isomerization of n-butenes. By proton abstraction, this complex can give rise to a negatively charged intermediate which accounts for the kinetic observations in the above reactions.
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