Means and method for reducing carbon dioxide to provide formic a

Details Means and method for reducing carbon dioxide to provide formic a Means and method for reducing carbon dioxide to provide formic a

1985-01-31

1986-11-04

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

204263, 204265, 204283, 204296, 429111, C25B 300

Patent

active

046209069

ABSTRACT:
A process and apparatus for reducing carbon dioxide to formic acid includes two redox couple electrolyte solutions separated by a first membrane having photosensitizers. The carbon dioxide to be reduced is provided to a second membrane which is contiguous to one of the redox couple electrolyte solutions. The second membrane has photosensitizers, a catalyst and high hydrogen overpotential material. Water provides hydrogen ions, which participate in the reduction of the carbon dioxide, via a separator. In operation both membranes are illuminated and produce excited photosensitizers which cause electron transfer from a first redox solution to a second redox solution and then to the carbon dioxide in the second membrane thereby, in cooperation with the hydrogen ions, reducing at least some of the carbon dioxide at a surface of the second membrane to provide formic acid.

REFERENCES:
patent: 4240882 (1980-12-01), Ang et al.
patent: 4523981 (1985-06-01), Ang et al.
patent: 4547273 (1985-10-01), Ayers

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