Abstract: Using a novel experimental apparatus with an improved agitator, a lumped kinetic model for the intermolecular hydrogen transfer reaction of pine gum over a Pd/C catalyst was investigated under nitrogen atmosphere. The component concentrations were acquired by tracking analysis by gas chromatography. The lumped components of the complex reaction systems were defined and the reaction network was proposed. The lumped kinetic model of monoterpene, abietic type resin acid, pimaric acid type resin acid, p-cymene, hydro-monoterpene, dehydro-abietic acid, hydro-abietic type resin acid, and hydro-pimaric acid type resin acid was established based on the structural groups and approximate reaction kinetic theory according to the fundamental principles of the lumped method. The reaction orders of monoterpene and resin acid were1 and2, respectively. The kinetic model parameters were estimated and the activation energy was calculated for various reactions of the lumped kinetic model. The lumping model could characterize the kinetic behavior of the complicated reaction system and predict the reactant-product concentrations at 533 K. The dehydrogenation was the main reaction during the intermolecular hydrogen transfer reaction of pine gum, and the reaction rate of the resin acids was greater than that of monoterpene.

Key words: palladium, activated carbon, supported catalyst, pine gum, hydrogen, transfer reaction, lumped kinetic model