Abstract
Current potential curves for the total current flowing through the reactor and for the current passing through a single ring of the column packing have been measured using solutions containing the ferroferricyanide couple. The theoretical formulation of current-potential plots has been extended to incorporate a fast reversible reaction in the presence of diffusion polarization. A method for deriving the film thickness and mass transfer limiting current from these plots has been provided.
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Abbreviations
- a :
-
integration constant in Equation 6
- b :
-
integration constant in Equation 8
- E :
-
applied potential (V)
- E r :
-
potential of the ring electrode with respect to the feeder electrode at the entry position of the reactor (V)
- E 1,E 2 :
-
reversible potentials of an anodic and cathodic reaction, respectively
- F :
-
Faraday constant
- h :
-
film thickness (cm)
- I :
-
current passing through segmented rings (mA)
- I F :
-
Faradaic current per unit length of wetted perimeter (A cm−1)
- I NF :
-
non-Faradaic current per unit length of wetted perimeter (A cm−1)
- I T :
-
total current per unit length of wetted perimeter (A cm−1)
- L :
-
half-length of Raschig ring (cm)
- i D :
-
limiting mass-transfer controlled current (A cm−1)
- i ′D :
-
limiting mass transfer controlled current at the end of the rings (A cm−2)
- iD, 1mM :
-
limiting mass transfer controlled current for 1 mM of redox couple
- io1, io2 :
-
exchange current for two reactions (one anodic and the other cathodic)
- n :
-
number of electrons transferred in an electrochemical reaction
- n 1,n 2 :
-
number of electrons transferred in two reactions (one anodic and the other cathodic)
- n c :
-
number of mmol of ferro-ferricyanide
- n r :
-
number of graphite Raschig rings in a single layer of a packed column
- r :
-
reaction rate (mol cm−2 s−1)
- R :
-
gas constant (8.314JK−1mol−1)
- r o,r i :
-
radii of the outer and inner perimeter of the ring (cm)
- (Re)f :
-
film Reynolds number (dimensionless)
- T :
-
temperature (K)
- v :
-
volumetric liquid flow rate (cm3 min−1)
- x :
-
axial co-ordinate along Raschig ring (cm)
- α1, α2 :
-
transfer coefficients for two reactions (one anodic and the other cathodic) (dimensionless)
- β :
-
fraction of the end areas of the rings which overlap (dimensionless)
- η :
-
electrode overpotential (V)
- η T :
-
total overpotential for half of a bipolar ring (V)
- v :
-
kinematic viscosity (cm2 s−1)
- π :
-
solution resistivity (Ω cm)
- θ s :
-
potential in the solution phase (V)
References
C. L. K. Tennakoon, PhD Thesis, University of Southampton, (1972).
M. Fleischmann, J. W. Oldfield and C. L. K. Tennakoon,Symposium on Electrochemical Engineering, University of Newcastle-upon-Tyne1 (1971) 53.
F. Goodridge, C. J. H. King and A. R. Wright,25th Meeting of the International Society for Electrochemistry, Brighton (1974).
C. J. H. King, K. Lister and R. E. Plimley,J. Inst. Chem. Eng. 53 (1975) 20.
R. Alkire,J. Electrochem. Soc. 120 (1973) 900.
A. Boussoulengas, PhD Thesis, University of Southampton (1976).
A. Ibrisagić, PhD Thesis, University of Southampton (1977).
M. Fleischmann and Z. Ibrisagić,J. Appl. Electrochem. 10 (1980) 157.
Idem, ibid 10 (1980) 169.
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Fleischmann, M., Ibrisagić, Z. Electrical measurements in bipolar trickle reactors. J Appl Electrochem 10, 151–156 (1980). https://doi.org/10.1007/BF00726079
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DOI: https://doi.org/10.1007/BF00726079