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Metallurgical Transactions B

, Volume 14, Issue 1, pp 95–99 | Cite as

The oxidation-reduction kinetics of palladium powder

  • Z. A. Munir
  • P. G. Coombs
Physical Chemistry

Abstract

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.

Keywords

Metallurgical Transaction Cyclic Oxidation Initial Reduction Reduction Cycle Palladium Oxide 
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Copyright information

© American Society for Metals and the Metallurgical Society of AIME 1983

Authors and Affiliations

  • Z. A. Munir
    • 1
  • P. G. Coombs
    • 1
  1. 1.Division of Materials Science and Engineering, College of EngineeringUniversity of CaliforniaDavis

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