The Ru/C-catalyzed hydrogenation reactions of lactic acid and propionic acid in aqueous solution were performed in a laboratory-scale stirred batch reactor. Kinetic data were collected over the ranges of temperature (343-423 K), hydrogen pressure (3.4-10.3 MPa) and acid feed concentration (0.05-5 M). The adsorption and reduction of individual acids, acid mixtures, and combinations of acids with their alcohol products on fully reduced catalyst were investigated. The acid conversion rates were not limited by mass-transport resistances over the reaction conditions studied. A Langmuir-Hinshelwood kinetic model was proposed to fit the acid conversion kinetics; rate constants and competitive adsorption coefficients for the reaction species were determined.
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