Abstract
Expressions for limiting currents are obtained to describe the heterogeneous electroxidation of a suspended solid particle in a stirred electrolyte. The electrochemical reaction involves oxidation of a dissolved cation (mediator) in the electrolyte followed by oxidation of the solid coal particle by the cation via an irreversible pseudo first order chemical reaction. This model is applied to bulk electrolysis of the acidic coal slurries containing dissolved Fe(II), and the observed limiting currents permit evaluation of the chemical rate constant of coal oxidation. In addition to Fe(III), multivalent cation of Cu(II) was found to enhance the rates of electrochemical oxidation of coal.
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