Catalytic Reforming of Acetic Acid as a Model Compound of Bio-Oil for Hydrogen Production Over Ni-CeO_2-MgO/Olivine Catalysts

摘要

Olivine was used as a support with CeO_2/MgO as promoters to synthesize a series of Ni-based catalysts by wet impregnation for reforming acetic acid as a model compound of bio-oil for H_2 production. These catalysts were characterized by X-ray diffraction, N_2 physisorption, and scanning electron microscope, respectively. Catalytic steam reforming of the acetic acid was performed in a bench scale fixed bed reactor at temperature 750℃, using a molar ratio of steam/carbon (S/C) of 5, and gaseous hourly space velocity at 2987 h~(-1). The effect of catalyst type on carbon conversion and hydrogen yield was determined. The activity and stability of catalyst Ni/olivine were significantly improved by CeO_2 and MgO addition. The 6%Ni-3%Ce-1%Mg/ olivine catalyst exhibited the best performance with carbon conversion of almost 100% and hydrogen yield up to 75%. The catalyst can he sustained for 70 h without deactivation.