Selective electro-oxidation of carbon monoxide with carbon-supported Rh- and Ir-porphyrins at low potentials in acid electrolyte
✍ Scribed by J.F. van Baar; J.A.R. van Veen; N. de Wit
- Publisher
- Elsevier Science
- Year
- 1982
- Tongue
- English
- Weight
- 325 KB
- Volume
- 27
- Category
- Article
- ISSN
- 0013-4686
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✦ Synopsis
During our study of carbon-supported Group VIII metatloporphyrins as oxygen reduction electrocatalysts it was found that calalysts based on Rh and Ir are very active in theelectrochemical oxidation of CO, particularly when pretreated at elevated temperatures in an inert atmosphere. The active site appears to be an isolated metal ion in a (thermally modified) porphyrin framework. During this CO-electro-oxidation rwclion the following three stages am be envisaged: (i) adsorption of CO onto an isolated metal centre, (ii) nucleophilic attack of H,O on the adsorbed CO, and (iii) decarboxylation. The Rh-and Iroornhvrin-Norit BRX catafvsts have the unioue feature of selectively oxidizing the CO component of ?Olc, gas mixtures.