The oxidation-reduction kinetics of palladium powder
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The cyclic oxidation-reduction of submicrometer sized palladium powder was investigated over the temperature range 848 to 923 K. The total oxygen uptake was found to decrease with increasing number of cycles as a consequence of sintering. Furthermore, sintering was found to be restricted to the reduction steps in these cycles. The relationships for the rate constants of the oxidation and reduction processes are, respectively, Kx, = (1.04)106 exp[-(74.1)103/RT],kr = (7.63)1012 exp[—(207.9)103/RT]. The activation energies for the oxidation of palladium powder and the reduction of palladium oxide are 74.1 and 207.9 kJ mol−1, respectively.
KeywordsMetallurgical Transaction Cyclic Oxidation Initial Reduction Reduction Cycle Palladium Oxide
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