Enhanced catalyst reactivity and separations using water/carbon dioxide emulsions
The difficulty of catalyst separation and recovery continues to create economic and environmental barriers to the broader industrial application of homogeneous catalysts for chemical transformations, despite the remarkable activity and selectivity attainable through sophisticated ligand design in these systems. A number of approaches termed biphasic catalysis have been advanced where a soluble catalyst is immobilized in one liquid phase (often aqueous) and the substrates and products are isolated in a separate immiscible phase. The authors wish to report a new aqueous biphasic homogeneous catalysis system that uses only water and environmentally benign supercritical carbon dioxide (CO{sub 2}) along with water-soluble catalysts and emulsion-forming surfactants which are active at the water/CO{sub 2} (w/c) interface. After reaction, the emulsion can be broken by simply decreasing the pressure to effect product separation and catalyst recycle.
- Research Organization:
- Univ. of Texas, Austin, TX (US)
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 20017319
- Journal Information:
- Journal of the American Chemical Society, Vol. 121, Issue 50; Other Information: PBD: 22 Dec 1999; ISSN 0002-7863
- Country of Publication:
- United States
- Language:
- English
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