Catalysis of the electro-oxidation of carbon monoxide by cobalt octaethylporphyrin.
The electro-oxidation of cobalt (II) octaethylporphyrin adsorbed on graphite electrodes, Co(II)(OEP)(ads') to Co(III)(OEP)(ads)(+), in the presence of aqueous solutions of CO leads to catalytic oxidation of CO to CO(2). No such oxidation occurs with Co(II)(OEP) and CO dissolved in nonaqueous solvents. Coordination of the CO to Co(III)(OEP)(+) is the first step in the catalytic mechanism. Nucleophilic attack on the coordinated CO by H(2)O is the probable rate-limiting step in the catalytic oxidation. A pseudo first-order rate constant of 0.3 s(-1) was estimated for this reaction.
Shi
C
C
Arthur Amos Noyes Laboratories, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA.
Anson
F C
FC