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versão impressa ISSN 0012-7353versão On-line ISSN 2346-2183
Resumo
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.
Palavras-chave : Hydrogenation; furfural; Nb2O5; kinetics; SMSI.