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- W2003191938 abstract "The advantages that can be realized by immobilizing electrocatalysts on electrode surfaces have become well recognized [l]. However, among the disadvantages of confining catalysts to electrode surfaces are the greater difficulties that are often encountered in establishing reaction orders and mechanisms because of inevitable uncertainties about both the effective surface concentrations of catalysts and their actual composition in cases where participation in the catalytic mechanisms by functional groups present on the surface may be involved. Such difficulties have been encountered in previous studies of the electrocatalysis of the reduction of dioxygen by metalloporphyrins attached to the surfaces of graphite or glassy carbon electrodes [2]. With these problems in mind, we have been exploring various possibilities for conducting studies of the catalysis of electron transfer reactions by immobilized metalloporphyrins under conditions where their surface concentrations are well-defined and the variety of available surface functional groups is smaller and better characterized than is true for graphite and glassy carbon surfaces. We have found that stable colloidal suspensions of inert supports such as silica or clays provide an effective means for dispersing insoluble catalysts such as metalloporphyrins in aqueous media where the kinetics and mechanisms of the reactions which they catalyze can be examined by conventional kinetic techniques. In this preliminary account we present the first results obtained on the reductions of dioxygen as catalyzed by cobalt tetraphenylporphyrin (CoTPP) and a cofacial" @default.
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- W2003191938 date "1988-12-01" @default.
- W2003191938 modified "2023-10-16" @default.
- W2003191938 title "Colloidal dispersions of silica as supports for insoluble metalloporphyrins that catalyze the reduction of dioxygen" @default.
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- W2003191938 doi "https://doi.org/10.1016/0022-0728(88)87020-7" @default.
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