Photoenhanced reduction process

Details Photoenhanced reduction process Photoenhanced reduction process

1978-07-10

1979-09-11

Weisstuch, Aaron

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204 59R, 204101, 204128, 204DIG3, 429111, C25B 100

Patent

active

041674618

ABSTRACT:
A system for the photoenhanced reduction of nitrogen. A p-type semiconductor cathode with a band gap between about 0.8 and 3.0 eV is irradiated with light falling within such energy range. The cathode is in contact with an electrolyte and capable of injecting photogenerated electrons into the electrolyte. An anode provides for removal of the resulting holes from the cathode. Cathode and anode are short circuited. For nitrogen molecule reduction, the electrolyte solution contains a chemical species capable in reduced form of chemically binding molecular nitrogen and of facilitating a series of reduction steps on the nitrogen. Specifically, such a chemical species is titanium isopropoxide.

REFERENCES:
patent: 4011149 (1977-03-01), Nozik
patent: 4094751 (1978-06-01), Nozik
patent: 4117202 (1978-09-01), Beck
Anonymous, "Prototype Solar Cell Used in Ammonia Process", C and EN, pp. 19-20, (Oct. 3, 1977).
G. N. Schrauzer et al., "Photolysis of H.sub.2 O and Photoreduction of N.sub.2 on TiO.sub.2 ", J. Am. Chem. Soc. vol. 99, pp. 7189-7193 (1977).
S. N. Frank et al., "Semiconductor Electrodes 12. Photoassisted Oxidations and Photoelectrosynthesis at Polycrystalline TiO.sub.2 Electrodes", J. Am. Chem. Soc. vol. 99, pp. 4667-4675 (1975).
E. E. Van Tamelen et al., "The Catalytic Fixation of Molecular Nitrogen by Electrolytic and Chemical Reduction", J. Am. Chem. Soc. vol. 91, p. 5194 (1969).
E. E. Van Tamelen et al., "Electrolytic Reduction of Molecular Nitrogen", J. Am. Chem. Soc. vol. 90, pp. 4492-4493 (1968).

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