Abstract
The surface area of dispersed platinum on different supports has been measured by means of a “titration” technique involving the interaction between chemisorbed oxygen and carbon monoxide. This reaction proceeds rapidly at room temperature in accordance with the stoichiometry O(s) + 2CO → CO(s) + CO2. Thus quantitative determination of the CO consumed and/or the CO2 formed offers a suitable measurement of the number of oxygen atoms chemisorbed on the platinum surface. It is found that on bulk as well as supported Pt catalysts the maximum value of OPt = 12, so that quantitative information on the surface area on Pt may be obtained from the CO titration. Repeated exposures of a PtAl2O3 catalyst to molecular oxygen at room temperature followed by CO titration result in an apparent increase in Pt dispersion caused most likely by crystal reorientation.
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