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The Competition between 4-Nitrophenol Reduction and BH(4)(−) Hydrolysis on Metal Nanoparticle Catalysts

Assessing competitive environmental catalytic reduction processes via NaBH(4) is essential, as BH(4)(−) is both an energy carrier (as H(2)) and a reducing agent. A comprehensive catalytic study of the competition between the borohydride hydrolysis reaction (BHR, releasing H(2)) and 4-nitrophenol red...

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Autores principales: Varshney, Shalaka, Meyerstein, Dan, Bar-Ziv, Ronen, Zidki, Tomer
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10535303/
https://www.ncbi.nlm.nih.gov/pubmed/37764306
http://dx.doi.org/10.3390/molecules28186530
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author Varshney, Shalaka
Meyerstein, Dan
Bar-Ziv, Ronen
Zidki, Tomer
author_facet Varshney, Shalaka
Meyerstein, Dan
Bar-Ziv, Ronen
Zidki, Tomer
author_sort Varshney, Shalaka
collection PubMed
description Assessing competitive environmental catalytic reduction processes via NaBH(4) is essential, as BH(4)(−) is both an energy carrier (as H(2)) and a reducing agent. A comprehensive catalytic study of the competition between the borohydride hydrolysis reaction (BHR, releasing H(2)) and 4-nitrophenol reduction via BH(4)(−) on M(0)- and M/M′ (alloy)-nanoparticle catalysts is reported. The results reveal an inverse correlation between the catalytic efficiency for BH(4)(−) hydrolysis and 4-nitrophenol reduction, indicating that catalysts performing well in one process exhibit lower activity in the other. Plausible catalytic mechanisms are discussed, focusing on the impact of reaction products such as 4-aminophenol and borate on the rate and yield of BH(4)(−) hydrolysis. The investigated catalysts were Ag(0), Au(0), Pt(0), and Ag/Pt-alloy nanoparticles synthesized without any added stabilizer. Notably, the observed rate constants for the 4-nitrophenol reduction on Ag(0), Ag-Pt (9:1), and Au(0) are significantly higher than the corresponding rate constants for BH(4)(−) hydrolysis, suggesting that most reductions do not proceed through surface-adsorbed hydrogen atoms, as observed for Pt(0) nanoparticles. This research emphasizes the conflicting nature of BH(4)(−) hydrolysis and reduction processes, provides insights for designing improved catalysts for competitive reactions, and sheds light on the catalyst properties required for each specific process.
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spelling pubmed-105353032023-09-29 The Competition between 4-Nitrophenol Reduction and BH(4)(−) Hydrolysis on Metal Nanoparticle Catalysts Varshney, Shalaka Meyerstein, Dan Bar-Ziv, Ronen Zidki, Tomer Molecules Article Assessing competitive environmental catalytic reduction processes via NaBH(4) is essential, as BH(4)(−) is both an energy carrier (as H(2)) and a reducing agent. A comprehensive catalytic study of the competition between the borohydride hydrolysis reaction (BHR, releasing H(2)) and 4-nitrophenol reduction via BH(4)(−) on M(0)- and M/M′ (alloy)-nanoparticle catalysts is reported. The results reveal an inverse correlation between the catalytic efficiency for BH(4)(−) hydrolysis and 4-nitrophenol reduction, indicating that catalysts performing well in one process exhibit lower activity in the other. Plausible catalytic mechanisms are discussed, focusing on the impact of reaction products such as 4-aminophenol and borate on the rate and yield of BH(4)(−) hydrolysis. The investigated catalysts were Ag(0), Au(0), Pt(0), and Ag/Pt-alloy nanoparticles synthesized without any added stabilizer. Notably, the observed rate constants for the 4-nitrophenol reduction on Ag(0), Ag-Pt (9:1), and Au(0) are significantly higher than the corresponding rate constants for BH(4)(−) hydrolysis, suggesting that most reductions do not proceed through surface-adsorbed hydrogen atoms, as observed for Pt(0) nanoparticles. This research emphasizes the conflicting nature of BH(4)(−) hydrolysis and reduction processes, provides insights for designing improved catalysts for competitive reactions, and sheds light on the catalyst properties required for each specific process. MDPI 2023-09-08 /pmc/articles/PMC10535303/ /pubmed/37764306 http://dx.doi.org/10.3390/molecules28186530 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Varshney, Shalaka
Meyerstein, Dan
Bar-Ziv, Ronen
Zidki, Tomer
The Competition between 4-Nitrophenol Reduction and BH(4)(−) Hydrolysis on Metal Nanoparticle Catalysts
title The Competition between 4-Nitrophenol Reduction and BH(4)(−) Hydrolysis on Metal Nanoparticle Catalysts
title_full The Competition between 4-Nitrophenol Reduction and BH(4)(−) Hydrolysis on Metal Nanoparticle Catalysts
title_fullStr The Competition between 4-Nitrophenol Reduction and BH(4)(−) Hydrolysis on Metal Nanoparticle Catalysts
title_full_unstemmed The Competition between 4-Nitrophenol Reduction and BH(4)(−) Hydrolysis on Metal Nanoparticle Catalysts
title_short The Competition between 4-Nitrophenol Reduction and BH(4)(−) Hydrolysis on Metal Nanoparticle Catalysts
title_sort competition between 4-nitrophenol reduction and bh(4)(−) hydrolysis on metal nanoparticle catalysts
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10535303/
https://www.ncbi.nlm.nih.gov/pubmed/37764306
http://dx.doi.org/10.3390/molecules28186530
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