Catalysis Letters, Vol.60, No.1-2, 51-57, 1999
Furfural hydrogenation over carbon-supported copper
Furfural hydrogenation over copper dispersed on three forms of carbon - activated carbon, diamond and graphitized fibers -were studied. Only hydrogenation of the C=O bond to form either furfuryl alcohol or 2-methyl furan occurred at temperatures from 473 to 573 K. Reduction at 573 K gave the most active catalysts, all three catalysts had activation energies of 16 kcal/mol, and turnover frequencies were 0.018-0.032 s(-1) based on the number of Cu-0 + Cu+ sites, which were counted by N2O adsorption at 363 K and CO adsorption at 300 K, respectively. The Cu/activated carbon catalyst showed no deactivation during 10 h on stream, in contrast to the other two catalysts. A simple Langmuir-Hinshelwood model invoking two types of sites was able to fit all kinetic data quite satisfactorily, thus it was consistent with the presence of both Cu-0 and Cu+ sites.