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Journal of Applied Electrochemistry

, Volume 8, Issue 4, pp 347–352 | Cite as

Analysis of the performance of packed-bed electrochemical reactors

  • Y. Volkman
Article

Abstract

The performance of a packed-bed electrochemical reactor with a parasitic reaction is analysed. Current efficiency and energy consumption are calculated using a linear approximation to the polarization equation. The results are presented as a function of dimensionless variables, which are characteristic of electrode and process parameters. The adverse effects of the parasitic reaction are estimated and ways to avoid them are discussed.

Keywords

Adverse Effect Physical Chemistry Energy Consumption Linear Approximation Electrochemical Reactor 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Nomenclature

a

specific interfacial area of the electrode bed (cm−2 cm−3)

c

concentration of reactants (g-mol cm−3)

F

Faraday constant (96 500 As g-mol−1)

I

superficial current density in the solution (A cm−2)

Id

superficial current density in the solution at the diaphragm (A cm−2)

IR

superficial current density in the solution of the useful reaction (A cm−2)

j

interfacial current density within the electrode (A cm−2)

j0

interfacial current density of the useful reaction within the electrode (A cm−2)

j1

interfacial current density of the parasitic reaction within the electrode (A cm−2)

km

mass transfer coefficient (cm s−1)

L

thickness of electrode bed (cm)

L1

Thickness of the ‘single reaction zone’ (Equation 6) (cm)

m

dimensionless variable (Equation 14)

n

number of electrons transferred in the electrochemical reaction

ΔW

excess specific power consumption (W/useful A)

w

dimensionless excess power consumption (Equation 21)

x

length variable (cm)

α

proportionality constant (Equation 2)

εi

current efficiency

η

electrode-electrolyte voltage difference (V)

η1

‘decomposition voltage’ for the parasitic reaction (V)

φ

dimensionless voltage drop variable (Equation 14)

k

effective conductivity of the electrolyte (Ω−1 cm−1)

Subscripts

0

the useful reaction; values atx=0.

1

the parasitic reaction; values atx=L1.

L

values atx=L

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References

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Copyright information

© Chapman and Hall Ltd. 1978

Authors and Affiliations

  • Y. Volkman
    • 1
  1. 1.Nuclear Research Centre - NegevAtomic Energy CommissionBeer-ShevaIsrael

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