Abstract
The adsorption of hydrogen and oxygen, as well as the reaction of hydrogen with adsorbed oxygen, was studied gravimetrically and volumetrically on platinum black. The water formed during the reaction leaves the surface and as it does so, it is not replaced by additional hydrogen. The amount of hydrogen adsorbed is the same on a reduced and evacuated surface as it is on a preoxidized surface. The ratio of adsorbed hydrogen and oxygen atoms to surface platinum atoms is close to unity at room temperature and a pressure of 50 torr.
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