Abstract
An investigation of H2 O2 titration stoichiometry was carried out on Pt Al2O3 catalysts using the gas chromatographic pulse technique. The catalyst samples were given different pretreatments which included sintering in air and hydrogen atmosphere. The stoichiometry, expressed by the ratio of hydrogen chemisorption: oxygen chemisorption: hydrogen titration (HC:OC:HT), was found to be 1:1:3 with a very good degree of reproducibility and was independent of the mean Pt crystallite size or of the pretreatment given to the catalysts, provided that the HC and OC values were calculated from the hydrogen and oxygen titers (HT and OT), respectively. When the HC and OC values were obtained by determining chemisorption on freshly reduced catalyst surfaces, no consistent stoichiometry was observed. A few H2 O2 cycles at room temperature smooth out or homogenize the surface to give reproducible results in the titrations.
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