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Abstract
A novel true differential calorimeter was used to measure the differential heat and kinetics of oxygen adsorption (approximately 300 K) on graphite-supported rhodium particles. The particle size distribution was determined using a transmission electron microscope and the phases of rhodium present were determined using X-ray diffraction. It was found that only true chemisorption occurs (not bulk oxidation), and that the differential heat of adsorption and the adsorption stoichiometry are a function of particle size. This is consistent with many earlier studies which show the catalytic behavior of rhodium particles to be dependent on size.
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