RATES OF ADSORPTION OF HYDROGEN ON PALLADIUM AND ON RHODIUM

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Abstract
A study of the effects of temperature and initial gas pressure on the kinetics of chemisorption of hydrogen on alumina-supported palladium and rhodium catalysts revealed, for both gas–solid systems, that the adsorption proceeded via three distinct and consecutive kinetic stages. Each stage could be described by the Elovich equation. The temporal range of existence of each kinetic stage was temperature- and pressure-sensitive, low initial pressures and high temperatures favoring early appearance of each stage. On increasing the temperatures from 0° to 400 °C, the amounts of hydrogen adsorbed on both solids decrease. Over that temperature range the rates of adsorption on Pd decrease, while those on Rh increase, with increasing temperature. The general effect of increasing the initial gas pressure over the range 10–60°mm Hg is to increase both rates and extents of adsorption.

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