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The oxidation of allyl alcohol on Au-electrode in acidic electrolytes

✍ Scribed by R. Celdran; J. González-Velasco

Publisher
Elsevier Science
Year
1981
Tongue
English
Weight
742 KB
Volume
26
Category
Article
ISSN
0013-4686

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✦ Synopsis

Ahstrrct

-The ally1 alcohol oxidation on a gold electrode in acidic medium has been achieved by means of the triangular voltage scan method, potentiostatic transients and rde, and the determination of final products by analysing ftnal products of elcctroIysis. The following results were obtained: (1) The overall reaction yields 2 electrons per ally1 alcohol molecule. (2) The final products determined were: HXHO, CH,-CHO, CH,-OHXHO, ethanol, isopropanol and mpropanol. Presence of CO, was not verified. (3) The oxidation takes place after an adsorption of the ally1 alcohol molecules on the electrode has zketics of the overall reaction are determined by a chemical step after two rapid charge transfer steps. The anodic reaction orders of ally1 alcohol and H* ions were: Za,bI = 0.2 and Z,+ = -0.2, respectively. It was possible to explain the kinetics of the oxidation by using the Temkin adsorption isotherm in the interpretation of the mechanism. The proposed mechanism was also in agreement with every experimental fact observed.

The fact that one unsaturated alcohol compound oxidizes, while the aliphatic alcohol hardly exhibit this kind of readion oo gold in acidic medium, seems to enhance the importance of the adsorption step, which would be mible due to the interaction between PC+ antibonding of the double bond and the dfilled bonds of the gold &trade.

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