Abstract

ROJAS, HUGO et al. HYDROGENATION OF FURFURAL ON Ir/Nb₂O₅ CATALYST STUDY KINETIC. Dyna rev.fac.nac.minas [online]. 2008, vol.75, n.155, pp.115-122. ISSN 0012-7353.

Kinetics of furfural hydrogenation over Ir/Nb₂O₅ catalyst with SMSI effect (Strong Metal Support Interaction) was studied. The effect of different parameters such as initial concentration (0,025 to 0,1 M), H₂ pressure partial (0,48 to 0,98 MPa), temperature (353 to 393 K) and catalyst loading (0,1 to 0,4 g) were examined. A high selectivity towards unsaturated alcohol (furfuryl alcohol) using this catalyst was demonstrated. The effect of solvent also was studied. The alcoholic solvents produces acetals traces, especially 2,6-diethyl-acetal. The initial rates of furfural hydrogenation increased linearly with the catalyst loading, indicating absence of mass transfer effects. The reaction kinetics was represented by a Langmuir-Hinshelwood model (LH). A single site Langmuir-Hinshelwood type model suggesting the addition of a hydrogen atom on the organic molecules as the rate determining step provided the best fit of the experimental data.

Keywords : Hydrogenation; furfural; Nb₂O₅; kinetics; SMSI.

        · abstract in Spanish     · text in Spanish     · Spanish ( pdf )