Alkanes, exchange with deuterium ethane

Table 6.4 shows Arrhenius parameters, rates and multiplicity factors for higher alkane exchanges with deuterium, mainly on metal films rates are generally somewhat higher than for ethane, and the temperature ranges used correspondingly... 

There is evidence with nickel and platinum that molecular addition is unimportant virtually the same alkane profile is given by non-equilibrated and equilibrated mixtures of hydrogen and deuterium. Unfortunately the measurements with platinum were made with propene where direct addition as shown by semi-logarithmic plots is absent (it appears with ethene but not propene, Figure 7.9). In addition to the evidence provided by the high values of q and s for ruthenium and osmium, which incidentally overcome the extensive alkene exchange to make ethane-rf2 the major product, the orders in deuterium are often somewhat... 

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