Electrocatalytic hydrogenation of acetophenone and benzophenone using palladium electrodes
We have studied the electrocatalytic hydrogenation of acetophenone and benzophenone using a) potentiometric titration of adsorbed hydrogen by the organic reactant in excess, b) electrochemical impedance spectroscopy at a potential at the onset of hydrogen evolution and c) electrolysis at constant po...
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todo:paper_00134686_v164_n_p125_Villalba2023-10-03T14:10:50Z Electrocatalytic hydrogenation of acetophenone and benzophenone using palladium electrodes Villalba, M. Del Pozo, M. Calvo, E.J. Acetophenone Benzophenone Electrocatalysis Hydrogenation Palladium Charge transfer Electrocatalysis Electrochemical impedance spectroscopy Electrodes Electrolysis Hydrogen Hydrogenation Ketones Palladium Reaction intermediates Titration Voltammetry Acetophenones Benzophenone Charge transfer resistance Concentration dependence Electrocatalytic hydrogenation Langmuir adsorption isotherms Potentiometric titrations Product distributions Gas adsorption We have studied the electrocatalytic hydrogenation of acetophenone and benzophenone using a) potentiometric titration of adsorbed hydrogen by the organic reactant in excess, b) electrochemical impedance spectroscopy at a potential at the onset of hydrogen evolution and c) electrolysis at constant potential at high adsorbed hydrogen coverage. The rate of reactions between adsorbed hydrogen and adsorbed ketones and the respective alcohols intermediates of hydrogenation have been obtained from the titration curves at different organic reagent concentrations. Both the reaction rate and the charge transfer resistance, Rct, for the H+/Hads reaction follow a concentration dependence that can be interpreted by a Langmuir adsorption isotherm for the organic molecules and also a blockage of the palladium surface for the hydrogen adsorption. From the results of electrolysis at controlled potential under high hydrogen coverage, the faradaic yield and the product distribution, namely 1-phenylethanol, ethylbenzene, diphenylmethanol, diphenylmethane have been obtained. © 2015 Elsevier Ltd. Fil:Villalba, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Calvo, E.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00134686_v164_n_p125_Villalba |
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Universidad de Buenos Aires |
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I-28 |
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R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Acetophenone Benzophenone Electrocatalysis Hydrogenation Palladium Charge transfer Electrocatalysis Electrochemical impedance spectroscopy Electrodes Electrolysis Hydrogen Hydrogenation Ketones Palladium Reaction intermediates Titration Voltammetry Acetophenones Benzophenone Charge transfer resistance Concentration dependence Electrocatalytic hydrogenation Langmuir adsorption isotherms Potentiometric titrations Product distributions Gas adsorption |
| spellingShingle |
Acetophenone Benzophenone Electrocatalysis Hydrogenation Palladium Charge transfer Electrocatalysis Electrochemical impedance spectroscopy Electrodes Electrolysis Hydrogen Hydrogenation Ketones Palladium Reaction intermediates Titration Voltammetry Acetophenones Benzophenone Charge transfer resistance Concentration dependence Electrocatalytic hydrogenation Langmuir adsorption isotherms Potentiometric titrations Product distributions Gas adsorption Villalba, M. Del Pozo, M. Calvo, E.J. Electrocatalytic hydrogenation of acetophenone and benzophenone using palladium electrodes |
| topic_facet |
Acetophenone Benzophenone Electrocatalysis Hydrogenation Palladium Charge transfer Electrocatalysis Electrochemical impedance spectroscopy Electrodes Electrolysis Hydrogen Hydrogenation Ketones Palladium Reaction intermediates Titration Voltammetry Acetophenones Benzophenone Charge transfer resistance Concentration dependence Electrocatalytic hydrogenation Langmuir adsorption isotherms Potentiometric titrations Product distributions Gas adsorption |
| description |
We have studied the electrocatalytic hydrogenation of acetophenone and benzophenone using a) potentiometric titration of adsorbed hydrogen by the organic reactant in excess, b) electrochemical impedance spectroscopy at a potential at the onset of hydrogen evolution and c) electrolysis at constant potential at high adsorbed hydrogen coverage. The rate of reactions between adsorbed hydrogen and adsorbed ketones and the respective alcohols intermediates of hydrogenation have been obtained from the titration curves at different organic reagent concentrations. Both the reaction rate and the charge transfer resistance, Rct, for the H+/Hads reaction follow a concentration dependence that can be interpreted by a Langmuir adsorption isotherm for the organic molecules and also a blockage of the palladium surface for the hydrogen adsorption. From the results of electrolysis at controlled potential under high hydrogen coverage, the faradaic yield and the product distribution, namely 1-phenylethanol, ethylbenzene, diphenylmethanol, diphenylmethane have been obtained. © 2015 Elsevier Ltd. |
| format |
JOUR |
| author |
Villalba, M. Del Pozo, M. Calvo, E.J. |
| author_facet |
Villalba, M. Del Pozo, M. Calvo, E.J. |
| author_sort |
Villalba, M. |
| title |
Electrocatalytic hydrogenation of acetophenone and benzophenone using palladium electrodes |
| title_short |
Electrocatalytic hydrogenation of acetophenone and benzophenone using palladium electrodes |
| title_full |
Electrocatalytic hydrogenation of acetophenone and benzophenone using palladium electrodes |
| title_fullStr |
Electrocatalytic hydrogenation of acetophenone and benzophenone using palladium electrodes |
| title_full_unstemmed |
Electrocatalytic hydrogenation of acetophenone and benzophenone using palladium electrodes |
| title_sort |
electrocatalytic hydrogenation of acetophenone and benzophenone using palladium electrodes |
| url |
http://hdl.handle.net/20.500.12110/paper_00134686_v164_n_p125_Villalba |
| work_keys_str_mv |
AT villalbam electrocatalytichydrogenationofacetophenoneandbenzophenoneusingpalladiumelectrodes AT delpozom electrocatalytichydrogenationofacetophenoneandbenzophenoneusingpalladiumelectrodes AT calvoej electrocatalytichydrogenationofacetophenoneandbenzophenoneusingpalladiumelectrodes |
| _version_ |
1807316894990991360 |