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Fundamental studies on a new concept of flue gas desulphurization

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Abstract

A new process for removal of sulphur dioxide from waste gases is proposed consisting of both electrochemical and catalytic sulphur dioxide oxidation. In the catalytic step a part of the sulphur dioxide is oxidized by oxygen on copper producing sulphuric acid and copper sulphate. The other part is oxidized electrochemically on graphite. The cathodic reaction of this electrolysis is used for recovering the copper dissolved in the catalytic step. The basic reactions of this process have been studied experimentally in detail. It has been shown that sulphur dioxide can be electrochemically oxidized on carbon electrodes to sulphuric acid with high current efficiency. The reaction rate of the electrochemical copper deposition is increased by dissolved sulphur dioxide in the electrolyte. The catalytic oxidation of sulphur dioxide on copper has been investigated for different sulphur dioxide concentrations and temperatures. The ratio of the reaction products, sulphuric acid and copper sulphate, varies over a wide range depending on the experimental conditions.

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Abbreviations

\(C_{{\text{SO}}_2 }^g \) :

SO2 concentration (gas phase) (vol % SO2)

\(C_{{\text{SO}}_2 }^1 \) :

SO2 concentration (electrolyte) (g l−1)

E :

potential vs saturated calomel electrode (V)

E s :

specific energy consumption (W g−1 SO2)

F :

Faraday constant (A s−1 mol−1)

i :

current density (mA cm−2)

\(M_{{\text{SO}}_2 } \) :

molecular weight (g mol−1)

T :

temperature (° C)

U c :

cell voltage (V)

v e :

number of electrons being transferred

\(\rho _{{\text{SO}}_{\text{2}} } \) :

space-time yield of SO2-oxidation (g SO2 h−1 dm−3)

θ cu :

space-time yield of Cu-corrosion (g Cu h−1 dm−3)

γ :

ratio\(\rho \)

\(\rho \) :

fractional conversion of SO2

\(\rho \) :

current efficiency for SO2 oxidation

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Author notes

  1. J. M. Bisang

    Present address: Facultad de Ingenieria Quimica, Universidad Nacional del Litoral, Santa Fe, Argentina

Authors and Affiliations

  1. Dechema-Institute, Frankfurt/Main, Federal Republic of Germany

    G. Kreysa, J. M. Bisang, W. Kochanek & G. Linzbach

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  1. G. Kreysa
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  2. J. M. Bisang
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  3. W. Kochanek
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  4. G. Linzbach
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Kreysa, G., Bisang, J.M., Kochanek, W. et al. Fundamental studies on a new concept of flue gas desulphurization. J Appl Electrochem 15, 639–647 (1985). https://doi.org/10.1007/BF00620559

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  • DOI: https://doi.org/10.1007/BF00620559

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