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- W2136037656 abstract "The mechanisms of exchange reactions of paraffins with deuterium on transition metal catalysts are briefly reviewed with an emphasis on those of ethane and cyclopentane on platinum. Convincing arguments are presented to show that the reactive sites are individual coordinatively highly unsaturated metal atoms such as those at corners, edges and on terraces, and thus relatively few in numbers. A key intermediate for multiple exchange formed on those sites is π-bonded alkene which exhibits a considerable degree of mobility including roll-over and inter-site transfer subsequent to the rupture of the weak metal-olefin π-bond. Mobility of transients is therefore a complicating factor which helps to explain the variety of features noted in initial deuteroisomer distributions, without requiring more than two or three fundamentally distinct types of single atom sites. An additional variable governing the relative rates of the various steps, including interconversion of σ-bonded alkyl and π-bonded olefin, is the electron density at each type of site. This can be varied for a given metal by dispersion, support effects, alloying and dopants." @default.
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- W2136037656 date "1994-04-01" @default.
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- W2136037656 title "Mobility of transient olefinic intermediates during exchange reactions of paraffins with deuterium on metal catalysts" @default.
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- W2136037656 doi "https://doi.org/10.1016/0304-5102(93)e0292-o" @default.
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