Abstract
Water photolysis over platinized TiO/sub 2/ (anatase and rutile) catalysts was carried out in the presence of inert gas (He) to examine the effect of ambient pressure on the reaction rate and stoichiometry. The evolution rates of hydrogen and oxygen were independent of the He pressure up to 1 atm over anatase and rutile catalysts. A thick water layer on the catalysts, however, gave a remarkable hindrance effect on the water photolysis even under reduced pressure. When the photolysis is very slow, a nonstoichiometric ratio of hydrogen to oxygen (H/sub 2//O/sub 2/ > 2) was observed due to the slow adsorption of oxygen on TiO/sub 3/. The photoadsorption of oxygen on the catalysts was trivial under the present experimental conditions. 26 references, 4 figures.
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