Abstract
The kinetics of adsorption and desorption of carbon monoxide on palladium polycrystalline surfaces is examined by measuring the “net” adsorption rate and the “net” desorption rate while the adsorption is actually proceeding. The net adsorption rate is proportional to the pressure of CO gas and is almost independent of the surface coverage of CO below 0.5. The initial sticking probability is 0.88, which stays constant in the temperature range between 339 and 466 K. The net desorption rate includes the thermal desorption rate and the adsorption-assisted desorption rate which is an increasing function of the gas-phase pressure of CO. The adsorption-assisted desorption rate increases continuously with the temperature of palladium with an activation energy of 4.9 kcal mol −1.
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