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Start Over Author "Glezakou, Vassiliki-Alexandra" Journal angewandte chemie
8 results on '"Glezakou, Vassiliki-Alexandra"'

3. Hydrogen Bonding Enhances the Electrochemical Hydrogenation of Benzaldehyde in the Aqueous Phase

Author

Sanyal, Udishnu, primary, Yuk, Simuck F., additional, Koh, Katherine, additional, Lee, Mal‐Soon, additional, Stoerzinger, Kelsey, additional, Zhang, Difan, additional, Meyer, Laura C., additional, Lopez‐Ruiz, Juan A., additional, Karkamkar, Abhi, additional, Holladay, Jamie D., additional, Camaioni, Donald M., additional, Nguyen, Manh‐Thuong, additional, Glezakou, Vassiliki‐Alexandra, additional, Rousseau, Roger, additional, Gutiérrez, Oliver Y., additional, and Lercher, Johannes A., additional

Published
2020
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5. Electrochemically Tunable Proton‐Coupled Electron Transfer in Pd‐Catalyzed Benzaldehyde Hydrogenation

Author

Koh, Katherine, primary, Sanyal, Udishnu, additional, Lee, Mal‐Soon, additional, Cheng, Guanhua, additional, Song, Miao, additional, Glezakou, Vassiliki‐Alexandra, additional, Liu, Yue, additional, Li, Dongsheng, additional, Rousseau, Roger, additional, Gutiérrez, Oliver Y., additional, Karkamkar, Abhijeet, additional, Derewinski, Miroslaw, additional, and Lercher, Johannes A., additional

Published
2019
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7. Hydrogen Bonding Enhances the Electrochemical Hydrogenation of Benzaldehyde in the Aqueous Phase.

Author

Sanyal, Udishnu, Yuk, Simuck F., Koh, Katherine, Lee, Mal‐Soon, Stoerzinger, Kelsey, Zhang, Difan, Meyer, Laura C., Lopez‐Ruiz, Juan A., Karkamkar, Abhi, Holladay, Jamie D., Camaioni, Donald M., Nguyen, Manh‐Thuong, Glezakou, Vassiliki‐Alexandra, Rousseau, Roger, Gutiérrez, Oliver Y., and Lercher, Johannes A.

Subjects
HYDROGEN bonding, HYDROGENATION, BENZYL alcohol, OXONIUM ions, CARBONYL group, BENZALDEHYDE, ADSORBATES
Abstract

The hydrogenation of benzaldehyde to benzyl alcohol on carbon‐supported metals in water, enabled by an external potential, is markedly promoted by polarization of the functional groups. The presence of polar co‐adsorbates, such as substituted phenols, enhances the hydrogenation rate of the aldehyde by two effects, that is, polarizing the carbonyl group and increasing the probability of forming a transition state for H addition. These two effects enable a hydrogenation route, in which phenol acts as a conduit for proton addition, with a higher rate than the direct proton transfer from hydronium ions. The fast hydrogenation enabled by the presence of phenol and applied potential overcompensates for the decrease in coverage of benzaldehyde caused by competitive adsorption. A higher acid strength of the co‐adsorbate increases the intensity of interactions and the rates of selective carbonyl reduction. [ABSTRACT FROM AUTHOR]

Published
2021
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8. Electrochemically Tunable Proton‐Coupled Electron Transfer in Pd‐Catalyzed Benzaldehyde Hydrogenation.

Author

Koh, Katherine, Sanyal, Udishnu, Lee, Mal‐Soon, Cheng, Guanhua, Song, Miao, Glezakou, Vassiliki‐Alexandra, Liu, Yue, Li, Dongsheng, Rousseau, Roger, Gutiérrez, Oliver Y., Karkamkar, Abhijeet, Derewinski, Miroslaw, and Lercher, Johannes A.

Subjects
BENZALDEHYDE, BENZYL alcohol, OXONIUM ions, HYDROGENATION, METAL ions
Abstract

Acid functionalization of a carbon support allows to enhance the electrocatalytic activity of Pd to hydrogenate benzaldehyde to benzyl alcohol proportional to the concentration of Brønsted‐acid sites. In contrast, the hydrogenation rate is not affected when H2 is used as a reduction equivalent. The different responses to the catalyst properties are shown to be caused by differences in the hydrogenation mechanism between the electrochemical and the H2‐induced hydrogenation pathways. The enhancement of electrocatalytic reduction is realized by the participation of support‐generated hydronium ions in the proximity of the metal particles. [ABSTRACT FROM AUTHOR]

Published
2020
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