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- W2073655765 abstract "One of the key hindrances on development of solid catalysts containing cobalt species for partial oxidation of organic molecules at mild conditions in conventional liquid phase is the severe metal leaching. The leached soluble Co species with a higher degree of freedom always out-performs those of solid supported Co species in oxidation catalysis. However, the homogeneous Co species concomitantly introduces separation problems. We have recently reported for the first time, a new oxidation catalyst system for the oxidation of organic molecules in supercritical CO2 using the principle of micellar catalysis. [CF3(CF2)8COO]2Co·xH2O (the fluorinated anionic moiety forms aqueous reverse micelles carrying water-soluble Co2+ cations in scCO2) was previously shown to be extremely active for the oxidation of toluene in the presence of sodium bromide in water–CO2 mixture, giving 98% conversion and 99% selectivity to benzoic acid at 120 °C. In this study, we show that the effects of varying the type of surfactant counterions and the length of the surfactant chains on catalysis. It is found that the use of [CF3(CF2)8COO]2Mg·yH2O/Co(II) acetate is as effective as the [CF3(CF2)8COO]2Co·xH2O and the fluorinated chain length used has a subtle effect on the catalytic rate measured. It is also demonstrated that this new type of micellar catalyst in scCO2 can be easily separated via CO2 depressurisation and be reused without noticeable deactivation." @default.
- W2073655765 created "2016-06-24" @default.
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- W2073655765 date "2003-07-01" @default.
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- W2073655765 title "Micellar catalysis for partial oxidation of toluene to benzoic acid in supercritical CO2: effects of fluorinated surfactants" @default.
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- W2073655765 doi "https://doi.org/10.1016/s0920-5861(03)00165-2" @default.
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