Abstract
The decomposition of hydrogen peroxide has been examined on a range of PdAu alloy compositions in a grease-free high-vacuum apparatus. The catalytic activity per cm 2 at 8.15M and 250°C varies little with the alloy composition, from 100 Pd0 Au to 10 Pd90 Au, where there is an increase by a factor 3 to 0 Pd100 Au. Much larger differences in activity, however, appear to be brought about by differences in surface pretreatment, attributed to the formation of a monolayer of adsorbed oxygen, which it is postulated may react with the perhydroxyl anion by the mechanism MO+O 2H −→M+OH −+O 2 To a first approximation this mechanism accounts for the effects of pH and the apparent frequency factor of the reaction and the absence of any correlation with holes in the d bands of the alloy.
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