Abstract
The kinetics of liquid-phase hydrogenation of cinnamaldehyde (CALD) were studied over Ru/Al2O3 catalysts of different metal dispersion in a slurry reactor, using ethanol as solvent, in the temperature range between 283 and 333 K. The reaction pathway has been described by using Langmuir−Hinshelwood type rate expressions. A two-site model was used to describe the kinetic experiments. The adsorption and hydrogenation of the CC and CO groups are suggested to occur on different sites with competitive adsorption of substrate and products. The kinetic parameters of the individual reaction steps have been determined by a nonlinear regression of the experimental data. The specific rate constants of the CC double-bond hydrogenation are smaller at the lowest Ru dispersion as a consequence of the weaker adsorption of the olefinic bond on the flat surface of the larger Ru crystallites. The specific activity of CO bond hydrogenation increases as the dispersion decreases. The adsorption strength of the carbonyl group r...
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