Hydrogen dissociation on platinum

However, a slight decrease in So by 10-20% is observed at high nozzle temperature (Tn) which is thought to be due to rotational excitation of D2 molecules [86]. Microscopic reversibility would lead one to predict that rotational cooling should occur on Pt(l 11) upon associative desorption, although no such measurement has been made. Note that a small rotational cooling has been observed for desorption not only from Cu surfaces [98], but also from Pd(l 0 0) surface where hydrogen dissociation is un-activated [99]. 

The coverage dependence, S o(0) on Pt(l 1 1) for a thermal source exhibits a rapid decrease with increasing coverage on Pt(l 1 1) at 7 s = 150 K [77, 83, 103], following a second order Langmurian behaviour with, S o(0) a (1 — 0)2, consistent with a direct adsorption process which requires two 

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It has been proposed that the reaction mechanism for n-hexane and n-heptane isomerization over platinum promoted WZ (PtAVZ) at temperatures about 200 °C is a bifunctional non-classic one [9,10]. Active sites are formed by the interaction of hydrogen dissociated on platinum, migrating by spillover, with WOx surface species. Room temperature... 

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