Abstract
The turnover rate for CO oxidation on palladium increases by a factor of 7.4, at 445 K and an equimolar ratio of reactants, when the total pressure increases from 10{sup {minus}6} to 10{sup 2} mbar. This effect of pressure is contrary to that expected from previous kinetic studies that predict no effect of pressure on rate, with one exception. Additionally, the apparent activation energy changes from ca. 110 kJ mol{sup {minus}1} at high pressure (10{sup 2} mbar) to ca. 75 kJ mol{sup {minus}1} at lower pressures (10{sup {minus}1} and 10{sup {minus}6} mbar), suggesting a change in reaction mechanism with pressure.
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