Selective electrogenerative oxidation of benzyl alcohol with platinum-graphite packed-bed anodes

The selective electrogenerative oxidation of benzyl alcohol in 1 M sulfuric acid solutions was studied on several types of graphite supported platinum packed-bed anodes in a hybrid continuous-flow cell with an oyxgen gas diffusion cathode. Benzaldehyde formed preferentially on all three catalytic pa...

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Bibliographic Details
Published in:Journal of applied electrochemistry 1997, Vol.27 (1), p.1-8
Main Authors: DIECKMANN, G. R, LANGER, S. H
Format: Article
Language:English
Subjects:
Chemistry
Electrochemistry
Exact sciences and technology
General and physical chemistry
Kinetics and mechanism of reactions
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Summary:The selective electrogenerative oxidation of benzyl alcohol in 1 M sulfuric acid solutions was studied on several types of graphite supported platinum packed-bed anodes in a hybrid continuous-flow cell with an oyxgen gas diffusion cathode. Benzaldehyde formed preferentially on all three catalytic packed beds under electrogenerative conditions (E sub anode < 0.75V), where the platinum catalyst was not irreversibly oxidized. Tin-palladium chloride-graphite pretreatment before platinum deposition through ethanol reduction significantly enhanced catalytic activity. This electrocatalyst provided current densities as high as 77 mA cm exp -2 (superficial packed-bed cross sectional area) with a platinum loading of 0.89 wt% Pt on graphite at relative low polarization. The origin of the catalytic activity is discussed, and evidence is presented on the roles of tin and palladium. Benzyl alcohol oxidation appears to provide a sensitive probe reaction for demonstrating the existence of special types of catalytic centers.
ISSN:0021-891X
1572-8838
DOI:10.1023/A:1026497229223