The conversion of glucose and sorbitol in the presence of Ru and Pt catalysts supported on carbon was carried out at different pressure and temperature conditions, using a batch and a semi-batch reactor. Attempts were made to improve the selectivity of glycols and alcohols (ethanol), introducing a promoter and inhibiter of the hydrogenolysis in the reactant mixture. On the basis of these results, which confirm the higher activity of Ru with respect to Pt, and the important role of an inhibitor like sulphur, the mechanism driving these reactions and the promising thermocatalytic conditions are clearer
The excess molar enthalpies H", of (xN20+(1-x)C,H,,) were measured in the liquid and supexcritical region covering the whole concentration range. Mixtures at 308.15 K and 7.64, 9.48 and 12.27 MPa show moderately endothermic and exothermic mixing in the heptane-rich region and nitrous oxide-rich region, respectively. The exothermic-mixing region is confiied to a smaller range of x as pressure increases and disappears completely at 308.15 K and 15.00 MPa. Mixtures at 318.15 K and 7.64 and 9.48 MPa show very exothermic mixing. Mixtures at 318.15 K and 12.27 and 15.00 MPa show moderately endothermic and exothermic mixing in the heptane-rich region and nitrous oxide-rich region, respectively. The changes observed in the excess enthalpy with temperature and pressure are discussed in terms of liquid-vapor equilibrium and critical constants for nitrous oxide-heptane. Excess enthalpies for nitrous oxide-heptane mixtures are also calculated by means of the Peng-Robinson equation of state and the resulting H", values are compared with experiment.
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