Kinetics of Catalytic Hydrogenation of 5-Hydroxymethylfurfural to 2,5-bis-Hydroxymethylfuran in Aqueous Solution over Ru/C
ANANDKUMAR B. JAIN, PRAKASH D. VAIDYA
Department of Chemical Engineering, Institute of Chemical Technology, Matunga, Mumbai, 400 019, India
5-Hydroxymethylfurfural (5-HMF) is a cellulosic product of the hydrolysis of biomass, and it is widely considered for the production of several interesting chemicals and derivatives. In the present work, catalytic hydrogenation of 5-hydroxymethylfurfural to 2,5-bishydroxymethylfuran was investigated using 5% Ru/C in the aqueous phase. Kinetic data were experimentally obtained over a wide range of temperatures (313–343 K), H2 partial pressure (0.69–2.07 MPa), initial HMF concentration (19.8–59.5 mM), and catalyst loading (0.3–0.7 kg/m3) in a three-phase slurry reactor. Disappearance of initial 5-HMF concentrations was modeled using the power law and Langmuir–Hinshelwood–Hougen–Watson models. A model based on the competitive adsorption of molecular H2 and HMF was proposed. It is presumed that surface reaction between non dissociatively chemisorbed H2 and 5-HMF was rate determining. This model provided the best fit for the kinetic data. From the Arrhenius equation, the activation energy for the surface reaction was found to be 104.9 kJ/mol.
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