Kinetics and mechanism of dissolution of synthetic molybdenum disulphide MoS2in bromate solutions Part II: Kinetics of molybdenum disulphide dissolution in the MoS2KBrO3H2SO4H2O system

  • Bartecki A
  • Rycerz L
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Abstract

The dissolution of synthetic molybdenum disulphide MoS2in aqueous potassium bromate solution in the presence of sulphuric acid was investigated. The influence of agitation rate, temperature, concentration of KBrO3and H2SO4, MoS2specific surface and addition of MoO3and Br-ions on the course of the dissolution process was determined. The dissolution of MoS2as a function of time shows a monotonically decreasing rate with no induction period. The agitation rate has no effect on MoS2dissolution in the system studied in the range 300-1550 min-1. The reaction rate constants depend on temperature, KBrO3and H2SO4concentrations and MoS2specific surface. The apparent activation energy determined as 32.3 kJ/mol is too large for reactions controlled by diffusion through a layer of reacted solid body and at the same time relatively low, although possible, for reactions proceeding in the kinetic region. Considering the good agreement of experimental data with a Shrinking Core Model equation for reactions controlled by the chemical process and the independence of the reaction rate of agitation rate, it is possible to accept that reactions proceed in the kinetic region. © 1988.

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