Electrochemistry of carbonaceous materials
1992; Elsevier BV; Volume: 71; Issue: 4 Linguagem: Inglês
10.1016/0016-2361(92)90038-p
ISSN1873-7153
AutoresRenato Tomat, Romeo Salmaso, Sandro Zecchin,
Tópico(s)Electrochemical Analysis and Applications
ResumoOxidation of subbituminous coal (Sulcis basin, Sardinia, Italy) by Fe(III) ions in aqueous H2SO4 solution was investigated over a wide temperature range (20–80 °C). Experimental results are in accord with a reaction scheme involving a reversible complex between coal particles and Fe(III) ions as a first step in the oxidation process. At low coal concentration, the reaction rate follows first-order kinetics in both coal and ferric ions (overall second order), while at sufficiently high coal concentration, the reaction rate is consistent with first-order kinetics in Fe(III) concentration, appearing to be independent of coal concentration. The kinetic results obtained give preliminary information on the advantageous use of the Fe(III)/slurried coal reaction system to depolarize the anodic compartment of an electrolysis cell, for the production of H2.
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