Supercritical hydroformylations
- Argonne National Lab., IL (United States)
The cobalt carbonyl catalyzed hydroformylation of propylene and related equilibrium and dynamic processes were investigated by means of high-pressure NMR spectroscopy with supercritical carbon dioxide as the reaction medium. Parameters measured in CO{sub 2} include: (1) the steady-state concentrations of the catalytic intermediates, (2) the thermodynamics and forward and reverse rate constants for the hydrogention of Co{sub 2}(CO){sub 8}, and (3) the net rate and product selectivity for the overall hydroformylation reaction. The results for the various measurements in the supercritical medium will be compared with literature values for conventional liquid solvents. Evidence for the presence of the radical, {center_dot}Co(CO){sub 4}, under hydroformylation conditions, and for a promotional effect of an added stable radical, {center_dot}V(CO){sub 6}, will also be presented. NMR spectral effects associated with the use of supercritical media, the use of toroid coils and cavities in high-pressure NMR probes, and a new toroid-cavity-imaging device will be described.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 126369
- Report Number(s):
- CONF-950402--
- Country of Publication:
- United States
- Language:
- English
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