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Supported ionic liquid catalysis--a new concept for homogeneous hydroformylation catalysis
Christian P Mehnert1, Raymond A Cook, Nicholas C Dispenziere
1ExxonMobil Research and Engineering Company, Corporate Strategic Research, and ExxonMobil Chemical Company, Basic Chemicals & Intermediates Technology, 1545 Route 22 East, Annandale, New Jersey 08801, USA. christian.p.mehnert@exxonmobil.com
Journal of the American Chemical Society
|October 31, 2002
Summary
Supported ionic liquid catalysis immobilizes ionic liquids on solid supports for efficient reactions. This approach combines benefits of homogeneous and heterogeneous catalysis, reducing ionic liquid usage.
Area of Science:
- Catalysis
- Materials Science
- Chemical Engineering
Background:
- Homogeneous catalysis offers high activity but suffers from difficult separation.
- Heterogeneous catalysis allows easy separation but can have lower activity.
- Ionic liquids provide unique reaction environments but are often expensive and difficult to recover.
Purpose of the Study:
- To introduce and describe the novel concept of supported ionic liquid catalysis (SILC).
- To highlight the advantages of SILC, including catalyst recovery and reduced ionic liquid use.
- To demonstrate the applicability of SILC in hydroformylation reactions.
Main Methods:
- Modification of a support material surface with covalently attached ionic liquid fragments.
- Formation of multiple layers of free ionic liquid on the modified support.
- Dissolution of a homogeneous hydroformylation catalyst within the supported ionic liquid phase.
Main Results:
- Successful application of supported ionic liquid catalysis for hydroformylation.
- Demonstration of combined advantages from ionic liquid media and solid support materials.
- Enabled application of fixed-bed technology for catalytic processes.
Conclusions:
- Supported ionic liquid catalysis offers an efficient method for combining homogeneous catalyst activity with heterogeneous process advantages.
- This technique significantly reduces the amount of ionic liquid required.
- The SILC concept shows potential for broad application in various catalytic processes beyond hydroformylation.
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