Published November 5, 2001
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Journal Article
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Catalysis of the Electro-Oxidation of Carbon Monoxide by Cobalt Octaethylporphyrin
- Creators
- Shi, Chunnian
- Anson, Fred C.
Abstract
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_2O 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.
Additional Information
© 2001 American Chemical Society. Received May 21, 2001. Publication Date (Web): September 26, 2001. This work was supported by the National Science Foundation. We are grateful to Prof. Karl Kadish for calling our attention to the reaction between Co(III) porphyrins and CO.Attached Files
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