Abstract
The kinetics of oxidation reaction pf hydrogen over silica-supported platinum catalyst was investigated in the temperature range ef O-45 C and the pressure range of 10-150mmHg.The kinetic behavior of the reaction depends on hydrogen pressure.In the low pressure range (10-20mmHg), the kinetic order with respect to hydrogen is 1. O and a significant isotope of effect is observed. The apparent activation energy is 6. O kcal/mol.In the high pressure range (20-150mmHg), the kinetic order is -0.5 and no isotope effect is observed. The apparent activation energy is 8. Okcal/mol.The kinetic order with respect to oxygen is 1.0 regardless of the hydrogen pressure. The reaction is not retarded by the product during the reaction.The experimental resuIts can be explained on the basis of the mechanism resulting from surfaee reaction between dissociatively adsorbed hydrogen and weakly bound oxygen molecules.
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