CATALYTIC HYDROGENATION OF NITROBENZENE IN SUPERCRITICAL CARBON DIOXIDE USING PD-CONTAINING CATALYSTS

Catalytic hydrogenation of nitrobenzene is studied using palladium catalysts in supercritical CO2, in a conventional solvent (isopropanol), and without a solvent. The reaction conditions in CO2 were as follows: temperature of 90 °С, nitrobenzene weight of 2,4 g, catalyst weight of 0,1 g, partial pressure of hydrogen of 5 MPa, and partial pressure of carbon dioxide of 20 MPa. The hydrogenation of nitrobenzene was shown to accelerate in CO2. The rate of formation of the target product – aniline – was shown to be 3,5–5 times higher in CO2 than in isopropanol or without a solvent. The selectivity in this case was 92–95 %. 

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