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Ethanol Upgrading to n-Butanol Using Transition-Metal-Incorporated Poly(triazine)imide Frameworks
Sabrine M Cypher1, Magnus Pauly2, Leslie G Castro1
1Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States.
ACS Applied Materials & Interfaces
|July 24, 2023
Summary
Researchers developed a novel supported molecular catalyst for upgrading ethanol to n-butanol via the Guerbet reaction. This new catalyst achieved 59% selectivity for n-butanol, marking a significant advancement in alcohol production.
Area of Science:
- Catalysis
- Materials Science
- Organic Chemistry
Background:
- The Guerbet reaction is a key process for producing higher alcohols from primary alcohols.
- Developing efficient and selective catalysts for the Guerbet reaction remains a significant challenge in chemical synthesis.
Purpose of the Study:
- To investigate the efficacy of a supported molecular catalyst for the upgrading of ethanol to n-butanol.
- To explore the use of a poly(triazine)imide (PTI) support integrated with an iridium complex for the Guerbet process.
Main Methods:
- Synthesis of a supported molecular catalyst by treating PTI-LiCl with [(Cp*)IrCl2]2 (Cp* = pentamethylcyclopentadienyl).
- Characterization of the catalyst material using UV-vis absorption and powder X-ray diffraction.
- Testing the catalytic performance in the Guerbet reaction of ethanol at 145 °C with sodium hydroxide.
Main Results:
- The PTI-(Cp*)Ir catalyst achieved 59% selectivity for n-butanol with a 13% yield at 145 °C.
- The synthesized PTI-(Cp*)Ir material exhibited distinct spectral and structural properties compared to its precursors.
- The catalyst demonstrated a high iridium loading of 27% per empirical framework unit.
Conclusions:
- The developed supported molecular catalyst is effective for the Guerbet reaction, producing n-butanol from ethanol.
- The unique properties of the PTI-(Cp*)Ir material contribute to its catalytic activity.
- Further investigation into higher chain alcohol formation is warranted.
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