Limonene hydrogenation in high-pressure CO2: effect of hydrogen pressure

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The effect of hydrogen partial pressure on the hydrogenation of limonene in high-pressure carbon dioxide, catalysed by carbon-supported palladium, was studied. Experiments were performed at various hydrogen pressures in the range from 2.5 up to 4.4 MPa at a fixed total pressure of 12.5 MPa, where the reaction mixture remains biphasic-liquid + gas. In these conditions, the liquid phase volume is expanded in relation to the initial volume of limonene in a fashion that is strongly dependent on the hydrogen to carbon dioxide pressure ratios. Surprisingly, the main factor in the kinetics of hydrogenation turns out to be the concentration (mol dm-3) of limonene, which decreases due to the volumetric expansion of the liquid phase when the CO2 pressure increases.

Original languageEnglish
Pages (from-to)225-230
Number of pages6
JournalJournal of Supercritical Fluids
Issue number2
Publication statusPublished - 1 Jun 2008


  • Biphasic hydrogenation
  • CO-expanded liquids
  • High-pressure carbon dioxide
  • Limonene


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