Abstract
Thiosulfate (S 2O 3 2−) and tetrathionate (S 4O 6 2−)are oxidized to sulfate by air at atmospheric pressure and 50–70°C in the presence of cuprous oxide (Cu 2O) as catalyst. Sulfate is produced from S 2O 3 2− by series-parallel reaction paths involving S 4O 6 2− as an intermediate. The rate data obtained for air oxidation of S 2O 3 2− on Cu 2O agree well with a pseudo-homogeneous first order kinetic scheme, yielding values of rate constants for series parallel reaction paths which have been used in modelling the catalyzed air oxidation of S 2O 3 2−. Air oxidation of S 4O 6 2− on Cu 2O proceeds at a higher rate in the presence of S 2O 3 2− than in its absence. Cu 2O is less active than Cu 2S for the air oxidation of S 2O 3 2−, as shown by the rate constant values which for Cu 2O catalyzed oxidation are an order of magnitude smaller than those for the Cu 2S catalyzed oxidation.
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