Abstract
Skeletal reactions of neopentane have been studied over a range of supported platinum-gold catalysts. The activation energy and frequency factor for the overall reaction rise with increasing gold content, and these changes are most pronounced in the gold-rich part of the composition range. The selectivity for isomerization passes through a maximum at an intermediate composition. This behavior is interpreted in terms of two different reaction mechanisms which require different types of active sites. The active sites are identified as different ensembles of surface platinum atoms, and ensemble probabilities at various gold contents have been estimated by computer simulation experiments for comparison with reaction data. Reaction selectivity is influenced by both ensemble availability and surface hydrogen concentration.
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