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A Ru/RuO2 heterostructure boosting electrochemistry-assisted selective benzoic acid hydrogenation
Zifan Cao1, Chenhui Wang1, Yifan Sun1
1School of Chemical Engineering & Technology, Tianjin University Tianjin 300350 China fuyan@tju.edu.cn zhangjinli@tju.edu.cn.
Chemical Science
|January 26, 2024
Summary
This study presents a novel carbon fiber-supported Ruthenium catalyst for electrocatalytic hydrogenation of benzoic acid to cyclohexanecarboxylic acid. The Ru/RuO2 heterojunction catalyst demonstrates excellent efficiency and stability in alkaline media.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Electrocatalytic hydrogenation (ECH) offers a sustainable alternative to thermal hydrogenation using water as the hydrogen source.
- Existing Pt-based catalysts for benzoic acid hydrogenation are limited by acidic electrolyte conditions, affecting solubility and stability.
- Developing efficient and stable electrocatalysts in neutral or alkaline media is crucial for practical applications.
Purpose of the Study:
- To develop a novel electrocatalyst for efficient benzoic acid (BA) hydrogenation to cyclohexanecarboxylic acid (CCA) in an alkaline environment.
- To investigate the catalytic performance, stability, and reaction mechanism of the developed catalyst.
- To provide a new strategy for fabricating heterostructure electrocatalysts.
Main Methods:
- Fabrication of carbon fiber-supported Ru electrocatalysts with Ru/RuO2 heterojunctions via cyclic electrodeposition.
- Electrocatalytic hydrogenation of benzoic acid under ambient conditions.
- Characterization using in situ Raman spectroscopy and theoretical calculations.
- Kinetic studies to determine the reaction mechanism.
Main Results:
- The Ru/RuO2 catalyst achieved 100% BA conversion and 100% selectivity towards CCA within 180 minutes.
- The catalyst exhibited excellent reusability and long-term stability in an alkaline electrolyte.
- 1-Cyclohexenecarboxylic acid (CEA) was identified as an intermediate, with selectivity influenced by applied potential.
- Kinetic studies indicated a Langmuir-Hinshelwood (L-H) mechanism, and theoretical calculations confirmed the role of the Ru/RuO2 interface in enhancing CEA adsorption.
Conclusions:
- The developed Ru/RuO2 heterostructure electrocatalyst is highly effective for benzoic acid hydrogenation in alkaline media.
- The Ru/RuO2 interface plays a critical role in facilitating the hydrogenation pathway by enhancing intermediate adsorption.
- This work offers a promising methodology for designing advanced heterostructure electrocatalysts for sustainable chemical transformations.
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