Effect of Mo Promoter on Catalysis Mechanism of Hydrodeoxygenation over Nickel-based Catalyst

A series of Ni-Mo/γ-Al2O3 catalysts were prepared by impregnation method.The effect of Mo addition on the catalyst properties,hydrodeoxygenation(HDO) products,active sites of HDO and adsorbed species of acetic acid(or ethanol) were studied by X-ray diffraction,Temperature programmed surface reaction and Fourier transform infrared spectroscopy.The HDO activity and selectivity were measured using a continuous flow fixed-bed microreactor.Addition of Mo improved the dispersion of NiO and partially inhibited the C-C bond cleavage of acetic acid,also supplied new oxygen vacancies which promoted the C-O bond dissociation of acetic acid or ethanol.This gave an increase of HDO activity and ethane selectivity.It was presumed that the catalysis mechanism of HDO over Nickel-based catalyst was changed by Mo addition.