期刊
JOURNAL OF SUPERCRITICAL FLUIDS
卷 51, 期 2, 页码 202-208出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.supflu.2009.08.011
关键词
Homogeneous catalyst; Hydrogenation; Supercritical carbon dioxide; Perfluorinated BINAP
资金
- Scientific and Technical Research council of Turkey [TUBITAK, 106T363]
- Cukurova University Research Foundation [FEF2007 BAP19]
New perfluorinated BINAP ligands and their cationic rhodium complexes have been synthesized and characterized. The catalysts have been tested in homogeneous hydrogenation of the styrene in both methanol and supercritical carbon dioxide (scCO(2)). The selective hydrogenations of the styrene in scCO(2) were carried out under the same reaction conditions of 343.15 K temperature and 120 bar CO2 pressure after 3 h (molar ratio of substrate to catalyst = 500). While all catalysts showed 100% conversion in methanol, same activity was not carried out in scCO(2). (R)-6.6-diperflorooktit-2,2'-bis(diphenylphosphino)-1,1'-binaphtyl-[Rh(COD)]BArF was showed the highest conversion (96.4%) in scCO(2). Furthermore, methanol was used as co-solvent in the supercritical media in hydrogenation of styrene for the perfluorinated catalysts, which were inactive in scCO(2). Addition of methanol in scCO(2) has rather increased the conversion. (C) 2009 Elsevier B.V. All rights reserved.
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