Aqueous-phase hydrogenation of biomass-derived itaconic acid to methyl-gamma-butyrolactone over Pd/C catalysts: Effect of pretreatments of active carbon

摘要

The effect of active carbon pretreatment on the catalytic performance of Pd/C catalysts in the hydrogenation of itaconic acid was studied. The catalysts were prepared by deposition-precipitation and characterized by XRD, BET, NH3-TPD, TEM and FT-IR. Due to the modification of the surface functional groups, surface structure and surface acidities of active carbon via pretreatment, the Pd/C catalysts showed varied catalytic performances. High dispersion and uniform particles were conducive to the excellent activity of Pd/C catalyst with support copretreated with HNO3 and NaClO, which exhibited 89.5% selectivity towards methyl-gamma-butyrolactone at 180 degrees C, 4 MPa H-2 for 20 h. (C) 2014 Elsevier B.V. All rights reserved.