Abstract
Intrinsic kinetics of the hydrogen reduction of cuprous sulfide (Cu2S) have been measured. Experiments were carried out in the temperature range 823 to 1023 K using a thermogravimetric analysis method. The reaction was studied in detail using both thin pellets and powder samples. The reaction followed first-order kinetics with respect to the solid reactant concentration as well as the hydrogen concentration. An activation energy of 92.0 kJ/mol (22.0 kcal/g-mole) was obtained for the reaction. Copper produced from the reaction formed filaments which sintered above about 1000 K.
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Abbreviations
- b :
-
number of moles of solid reacted by one mole of gaseous reactant
- CH2 :
-
molar concentration of hydrogen (mol ⋅ cm-3)
- E :
-
activation energy
- k :
-
reaction-rate constant defined in Eq. [4] (cm3 ⋅ mor-1 ⋅ s-1)
- k b :
-
apparent rate constant given in Eqs. [3] and [4] (s-1)
- k o :
-
pre-exponential factor fork (cm-3 ⋅ mol-1 ⋅ s-1)
- m :
-
constant in the nucleation and growth kinetics given in Eq. [3] (-)
- R p :
-
half thickness of the sample (cm)
- S :
-
term defined by Eq. [7]
- t :
-
time (s)
- T :
-
temperature (K)
- X B :
-
fractional conversion of the solid (-)
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Sohn, H.Y., Won, S. Intrinsic kinetics of the hydrogen reduction of Cu2S. Metall Trans B 16, 831–839 (1985). https://doi.org/10.1007/BF02667520
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DOI: https://doi.org/10.1007/BF02667520