Intrinsic kinetics study of rosin hydrogenation on a nickel catalyst supported on spent equilibrium catalyst

Abstract

Reaction pathways and intrinsic kinetics of rosin hydrogenation over a spent equilibrium catalyst-supported nickel catalyst were investigated in a batch reactor. Gas chromatography-mass spectrometry (GC-MS) analysis revealed that the reaction pathway of rosin involved isomerization, hydrogenation, and dehydrogenation of various resin acids. In the temperature range between 423 and 453 K and stirring rates above 500 rpm, external and internal mass transfer limitations in catalyst particles with a size of 20-80 mm were eliminated. A power-law model was used to determine the intrinsic kinetic parameters of rosin hydrogenation based on the experimental data. The results showed that reactivity trends of rosin hydrogenation below 453 K are well-fitted by a pseudo-first-order kinetic model. Activation energies for neoabietic acid isomerization, palustric acid isomerization, abietic acid (AA) partial hydrogenation, AA hydrogenation, AA dehydrogenation, and pimaric acids hydrogenation were 66. 60, 58.06, 73.02, 86.67, 107.42, 37.60 kJ mol À1, respectively.

Catalytic methyl esterification of colophony over ZnO/SFCCR with subcritical CO 2 : catalytic performance, reaction pathway and kinetics

“…The composition of colophony is complex and consists of a variety of resin acids. The main components of the colophony used in this work were abietic acid (AA), palustric acids (PA), neoabietic acids (NA) and dehydroabietic acids (DA), and these compounds were able to undergo isomerization due to the presence of conjugated double bonds, while the CMEs include methyl abietate (MEA), methyl dehydroabietate (MEDA), methyl neoabietate (MENA) and methyl palustrate (MEPA) [ 33 , 34 ]. The catalysis of ZnO/SFCCR with sub-CO 2 promoted the esterification reaction between the carboxyl groups of these acids and the methanol hydroxyl groups, but there have been no reports regarding the methyl esterification reactions of colophony acids or examinations of the complex isomerization and esterification processes.…”

Synthesis, characterization and activity performance of nickel-loaded spent FCC catalyst for pine gum hydrogenation

“…According to the GC-MS results and in light of some previous reports, 54,55 the proposed reaction mechanism is shown in Fig. 11.…”

Advances in Rosin-Based Chemicals: The Latest Recipes, Applications and Future Trends

“…Hydroabietic acid can be prepared from rosin and hydrogen using palladium/SBA-15 mesoporous silica catalyst, according to Scheme 46 [207]. This catalyst is more efficient than others [208,209] Its applications include oxidation-resistant solvent-borne tackifiers and coatings, a substrate for esterification with glycerol [210], additives for polyvinylidene difluoride binders for lithium titanium oxide anodes [76]. It can be used in high-performance liquid epoxy resins [83], for synthesis of high adhesion polyurethane acrylate [173].…”