Methods and apparatus for using gas and liquid phase cathodic de

Electrolysis: processes – compositions used therein – and methods – Electrolytic synthesis – Preparing inorganic compound

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205466, 205468, 205633, 205626, 205636, 205635, C25B 100, C25B 130, C25B 102

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active

057700338

ABSTRACT:
The invention provides methods for using gas and liquid phase cathodic depolarizers in an electrochemical cell having a cation exchange membrane in intimate contact with the anode and cathode. The electrochemical conversion of cathodic depolarizers at the cathode lowers the cell potential necessary to achieve a desired electrochemical conversion, such as ozone evolution, at the anode. When gaseous cathodic depolarizers, such as oxygen, are used, a gas diffusion cathode having the cation exchange membrane bonded thereto is preferred. When liquid phase cathodic depolarizers are used, the cathode may be a flow-by electrode, flow-through electrode, packed-bed electrode or a fluidized-bed electrode in intimate contact with the cation exchange membrane.

REFERENCES:
patent: 4020142 (1977-04-01), Davis et al.
patent: 4316782 (1982-02-01), Foller et al.
patent: 5595641 (1997-01-01), Traini et al.
Fenton, "Synthesis of Hydrogen Peroxide in a Proton Exchange Membrane Electrochemical Reactor", Apr. 1993.

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