Characterization of the hydrogenation process of ally! alcohol at a pt electrode using a double galvanostatic pulse technique

Itamar Willner, Murray Rosen, Yoav Eichen

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Abstract

The adsorption properties of ally alcohol and the kinetics of its hydrogenation at a Pt electrode are characterized by means of a double galvanostatic pulse technique. It is found that the adsorption of allyl alcohol on the Pt electrode follows a Langmuir isotherm with an adsorption constant Kad = 1.3 x 105 M-1. Hydrogenation of adsorbed allyl alcohol by cathodically generated H atoms proceeds on the Pt electrode. The hydrogenation process shows a saturation kinetics that can be analyzed in terms of active sites for ally alcohol activation. The number of active sites for activation of ally alcohol corresponds to 31% of a H atom monolayer with a surface density of 0.67 nmol/cm2. The rate constant for the hydrogenation of surface activated ally alcohol corresponds to kp- 438 S-1. The amount of Pt-adsorbed allyl alcohol remains constant during the hydrogenation process, implying rapid exchange of bulk alcohol solute and the adsorbed species.

Original languageEnglish
Pages (from-to)434-439
Number of pages6
JournalJournal of the Electrochemical Society
Volume138
Issue number2
DOIs
StatePublished - Feb 1991

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