Electrochemical removal of H2S from hot coal gas: electrode kinetics
1985; Elsevier BV; Volume: 30; Issue: 4 Linguagem: Inglês
10.1016/0013-4686(85)80041-4
ISSN1873-3859
AutoresKenneth Alan White, Jack Winnick,
Tópico(s)Thermal and Kinetic Analysis
ResumoThe reaction kinetics attending the electrochemical reduction of H2S in molten sulfide at 830°C are examined. A mixture of sodium and potassium sulfides, melting around 700°C is used throughout, as are graphite electrodes. Potential-step experiments show large exchange currents, of the order of 10−1 A cm−2. The reaction rate is dependent on nearly the square-root of the H2S pressure. The oxidation reaction, of sulfide to elemental sulfur, is zero-order in H2S pressure. The results are in agreement with mechanisms found by others at lower temperatures. Melting points of several binary alkali sulfides were also determined.
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