Chemistry: electrical and wave energy – Processes and products
Patent
1987-12-29
1988-12-27
Andrews, R. L.
Chemistry: electrical and wave energy
Processes and products
204DIG3, C25C 100
Patent
active
047939052
ABSTRACT:
A transition metal electrocatalyst surface (e.g. a porous surface of finely divided Group VIII or Group I-B metal with an attached current collector) is modified by a sulfur treatment, using an oxidized sulfur species of average sulfur oxidation state of about 4 or less, e.g. SO.sub.2 dissolved in aqueous acid. Treatment of the transition metal with SO.sub.2 or the like typically provides up to 100% coverage of the surface electrocatalyst sites with chemisorbed sulfur-containing species and perhaps subsurface effects as well, but washing or other non-electrochemical techniques can remove 5-90% (e.g. 25-70%) of the chemisorbed SO.sub.2 or the like from the surface, leaving substantially only a very strongly bound form of the sulfur-containing species. The strongly bound sulfur-containing species can then be reduced to form a highly beneficial, selectivity-improving pattern of sites containing reduced --S (e.g. sulfur or sulfide) on the electrocatalyst surface. Electrochemical synthesis cells can be constructed from a cathode and/or anode made form the S-treated electrocatalyst and used in highly selective syntheses of useful organic and inorganic compounds from various starting materials, e.g. by reduction of O.sub.2 to H.sub.2 O.sub.2, reduction of NO to NH.sub.2 OH, oxidation of RCH.sub.2 OH to RCOOCH.sub.2 R (R=lower alkyl, etc.), oxidation of RR'CHOH to RCOR' (R and R'=lower alkyl, etc.) or the like.
REFERENCES:
patent: 3336386 (1967-08-01), Dovell et al.
patent: 4656147 (1987-04-01), Iida et al.
Banholzer, W. F., et al, Surf. Sci. 128, 176 (1983).
Banholzer, W. F., et al, J. Catal. 85, 127 (1984).
Park et al, Surf. Sci. 155, 341 (1985).
Fischer, T. E., et al, J. Catal. 53, 24 (1978).
Gohndrone, J. M., et al, J. Catal. 53, 24 (1978).
Harris, P. J. F., Nature 323, 792-794 (1986).
Langer, S. H., et al, J. Electrochem. Soc. 122, 1619-1623 (1975).
Langer, S. H., et al, Ind. Eng. Chem. Proc. Des. Dev. 18, 567 (1979).
Langer, S. H., et al, Ind. Eng. Chem. Proc. Des. Dev. 22, 264-271 (1983).
Langer, S. H., et al, Pure and Appl. Chem. 58, 895-906 (1986).
Larry-Pitera, E., et al, Electrochim. Acta 30, 971 (1985).
Matsumoto et al, J.C.S. Faraday I, 76, 1116 (1980).
Pate, K. T., et al, Environ. Sci. Technol. 19, 371 (1985).
Pesselman, R. L., et al, Chem. Eng. Commun. 38, 265-273 (1985).
Shono, T., et al, Tetrahed, Letters 40, 3861-3864 (1979).
Loucka, T., J. Electroanal. Chem. 31, 319-332 (1971).
Schmidt, L. D., et al, J. Catalysis 22, 269-279 (1971).
Spotnitz, R. M., et al, Electrochim. Acta 28, 1053-1062 (1983).
Card John C.
Foral Michael J.
Langer Stanley H.
Andrews R. L.
Wisconsin Alumni Research Foundation
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