Abstract
Batch electrochemical reactor models for parallel reaction sequences are developed for cells operating galvanostatically. Independent and dependent parallel reactions and a parallel-series reaction scheme are considered and emphasis is placed on the development of analytical expressions to predict reactor behaviour. Electro-organic synthesis reactions such as the production of betaalanine and glyoxylic acid are considered as examples. Experimental data for the electro-oxidation of aqueous oxalic acid and glyoxylic acid solutions are shown to be in reasonable agreement with the reaction analysis.
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Abbreviations
- a :
-
Parameter defined in Equation 21
- C sj :
-
Surface concentration of species j
- C j :
-
Bulk concentration of species j
- C jo :
-
Initial concentration of species j
- C Bmax :
-
Maximum concentration of species B
- CE :
-
Current efficiency
- E :
-
Electrode potential
- F :
-
Faraday constant
- i p :
-
Partial current density of step p of reaction scheme
- i t :
-
Total current density
- k fp :
-
Forward electrochemical rate constant of step p
- k Lj :
-
Mass transfer coefficient for species j
- K L :
-
Dimensionless mass transfer parameter
- n p :
-
Number of electrons in step p of reaction scheme
- S :
-
Electrode area
- t :
-
Reaction time
- V :
-
Batch reactor volume
- β p :
-
Constant describing potential dependency of reaction rate constant of reaction step p
- Y 1,Y 2,Y 3 :
-
Effective overall resistance factors
- τg :
-
Dimensionless reaction time for galvanostatic operation
- τp :
-
Dimensionless reaction time for potentiostatic operation
References
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Scott, K. Reactor engineering models of complex electrochemical reaction schemes. III. Galvanostatic operation of parallel reactions in batch reactors. J Appl Electrochem 15, 837–858 (1985). https://doi.org/10.1007/BF00614360
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DOI: https://doi.org/10.1007/BF00614360