Electrifying Hydroformylation Catalysts Exposes Voltage-Driven C-C Bond Formation.
Joy S Zeng1, Emma L Cosner2, Spencer P Delgado-Kukuczka2
1Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States.
Journal of the American Chemical Society
|June 10, 2024
Summary
Researchers developed a new electrocatalyst for electrochemical hydroformylation (electro-HFN), a challenging carbon-carbon bond-forming reaction. This novel approach significantly enhances reaction rates compared to traditional methods, paving the way for greener chemical manufacturing.
Area of Science:
- Catalysis
- Electrochemistry
- Green Chemistry
Background:
- Electrochemical reactions offer mild conditions for chemical synthesis, crucial for decarbonizing manufacturing.
- Many established thermochemical reactions, like hydroformylation (thermo-HFN), are challenging to perform electrochemically.
- Electrochemical hydroformylation (electro-HFN) is a complex C-C bond-forming reaction difficult to achieve with heterogeneous electrocatalysts.
Purpose of the Study:
- To develop an effective electrocatalyst for electrochemical hydroformylation (electro-HFN).
- To adapt a known thermochemical hydroformylation catalyst for electrochemical applications.
- To investigate the mechanism of the electro-HFN reaction.
Main Methods:
- Importing Rh-based thermochemical hydroformylation catalysts onto electrode surfaces.
- Conducting electro-HFN reactions under mild conditions (room temperature, 5 bar CO).
- Utilizing reaction kinetics and *operando* X-ray absorption spectroscopy for mechanistic studies.
Main Results:
- Achieved Faradaic efficiencies up to 15% and turnover frequencies up to 0.7 h-1 for electro-HFN.
- Observed electro-HFN rates an order of magnitude higher than corresponding thermo-HFN rates.
- Identified distinct elementary steps in the electro-HFN mechanism compared to thermo-HFN.
Conclusions:
- Demonstrated a viable strategy for electrifying a well-studied thermochemical reaction.
- Unveiled a novel electrocatalyst for the complex and underexplored electro-HFN reaction.
- The findings support the potential of electrochemistry in advancing sustainable chemical manufacturing.
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