INSTITUTO DE QUIMICA, FISICA DE LOS MATERIALES, MEDIOAMBIENTE Y ENERGIA
Unidad Ejecutora - UE
Electrocatalytic hydrogenation of acetophenone and benzophenone using palladium electrodes
MATIAS ARIEL VILLALBA; MARÍA DEL POZO; ERNESTO JULIO CALVO
PERGAMON-ELSEVIER SCIENCE LTD
Lugar: Amsterdam; Año: 2015 vol. 164 p. 125 - 125
We have studied the electrocatalytic hydrogenation of acetophenone and benzophenone using a)potentiometric titration of adsorbed hydrogen by the organic reactant in excess, b) electrochemicalimpedance spectroscopy at a potential at the onset of hydrogen evolution and c) electrolysis at constantpotential at high adsorbed hydrogen coverage. The rate of reactions between adsorbed hydrogen andadsorbed ketones and the respective alcohols intermediates of hydrogenation have been obtained fromthe titration curves at different organic reagent concentrations. Both the reaction rate and the chargetransfer resistance, Rct, for the H+/Hads reaction follow a concentration dependence that can beinterpreted by a Langmuir adsorption isotherm for the organic molecules and also a blockage of thepalladium surface for the hydrogen adsorption. From the results of electrolysis at controlled potentialunder high hydrogen coverage, the faradaic yield and the product distribution, namely 1-phenylethanol,ethylbenzene, diphenylmethanol, diphenylmethane have been obtained.