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SELECTIVE OXIDATION IN SUPERCRITICAL CARBON DIOXIDE USING CLEAN OXIDANTS
SahleDemessie*, E, M A. Gonzalez*, J Enriquez*, AND A Q. Zhao*. SELECTIVE OXIDATION IN SUPERCRITICAL CARBON DIOXIDE USING CLEAN OXIDANTS. INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH. American Chemical Society, Washington, DC, 39(12):4858-4864, (2000).
We have systematically investigated heterogeneous catalytic oxidation of different substrates in supercritical carbon dioxide (SC-CO2). Three types of catagysts: a metal complex, 0.5% platinum g-alumina and 0.5% palladium g-alumina were used at a pressure of 200 bar, temperatures 60-150C and for 3-18 hours for partial oxidation of organic substrates. The metal-oxo catalyst used gave as high as 3.9% conversion of cycloxene to its oxides and epoxides, where the major products being the ketone and alcohol. The oxidation of cyclohexene strongly depended on the concentration of oxygen, whereas, longer reactions period (3-18hours) and temperatures (60-150C) showed to be less significant on the conversion and selectivity of the reaction. Oxidation of cyclohexene over Pd and Pt/Al203 catalyst resulted in a mixture of dehydrogenation and oxygenated products.