Electrochemical gas separation including catalytic regeneration

Details Electrochemical gas separation including catalytic regeneration Electrochemical gas separation including catalytic regeneration

C - Chemistry, Metallurgy

25

B

204/123, 204/80

C25B 1/10 (2006.01) C01B 13/02 (2006.01) C25B 1/00 (2006.01) C25B 1/02 (2006.01)

Patent

CA 1155085

ABSTRACT An electrochemical cell used to separate gas from a gaseous mixture by reduction of said gas at the cathode and regeneration of said gas at the anode is characterised in that one or more substances formed during the cathodic reduc- tion and/or the anodic regeneration is or are chemically converted, preferably by catalytic decomposition, to produce further quantities of said gas, the gas formed by both the anodic regeneration and the chemical conversion being re- covered as the product. In an especially preferred embodiment a plurality of said cells are used in apparatus for extracting oxygen from the air by using a cathode comprising high surface area graphite powder which reduce s oxygen to pro- duce peroxyl ions, each cell being further provided, externally of the cathode compartment, with means for catalytically decomposing the peroxyl ions produced d, suitable catalysts being CoFe2o4 or NiCo2o4.

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