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...
Guardado en:
| Autores principales: | , |
|---|---|
| Publicado: |
2015
|
| Materias: | |
| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00134686_v164_n_p125_Villalba http://hdl.handle.net/20.500.12110/paper_00134686_v164_n_p125_Villalba |
| Aporte de: |
| id |
paper:paper_00134686_v164_n_p125_Villalba |
|---|---|
| record_format |
dspace |
| spelling |
paper:paper_00134686_v164_n_p125_Villalba2023-06-08T14:35:47Z Electrocatalytic hydrogenation of acetophenone and benzophenone using palladium electrodes Villalba, Matias Ariel Calvo, Ernesto Julio 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. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00134686_v164_n_p125_Villalba http://hdl.handle.net/20.500.12110/paper_00134686_v164_n_p125_Villalba |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
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, Matias Ariel Calvo, Ernesto Julio 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. |
| author |
Villalba, Matias Ariel Calvo, Ernesto Julio |
| author_facet |
Villalba, Matias Ariel Calvo, Ernesto Julio |
| author_sort |
Villalba, Matias Ariel |
| 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 |
| publishDate |
2015 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00134686_v164_n_p125_Villalba http://hdl.handle.net/20.500.12110/paper_00134686_v164_n_p125_Villalba |
| work_keys_str_mv |
AT villalbamatiasariel electrocatalytichydrogenationofacetophenoneandbenzophenoneusingpalladiumelectrodes AT calvoernestojulio electrocatalytichydrogenationofacetophenoneandbenzophenoneusingpalladiumelectrodes |
| _version_ |
1768542968944263168 |