Selective Hydrogenation of 1-Octyne over Ni-B/Al2O3 Catalyst
1. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;
2. State Key Laboratory of Green Chemical Engineering and Industrial Catalysis, Shanghai Research Institute of Petrochemical Technology, SINOPEC, Shanghai 201208, China
Abstract：Ni/Al2O3 and Ni-B/Al2O3 catalysts were prepared by hydrogen and potassium borohydride reduction respectively, and were characterized by X-ray diffraction (XRD), Transmission electron microscope (TEM), H2-temperature program reduction (H2-TPR), UV-visible diffuse-reflectance spectrum (UV-vis DRS) and X-ray photoelectron spectroscopy (XPS). The catalytic performance of prepared catalysts was evaluated by selective hydrogenation of 1-octyne. Physicochemical characterizations revealed that the introduction of chemical reduction method resulted in the formation of small Ni nanoparticles, the limited amount of Ni active sites for hydrogenation and the presence of electron-enriched Ni species. Owing to the decreased Ni particle size, Ni-B/Al2O3 catalyst exhibited good activity compared to the Ni/Al2O3 catalyst with more active sites but larger size. The electron-enriched Ni species weakened the adsorption of 1-octene and thus suppressed over hydrogenation of 1-octene, which contributed to the obviously enhanced selectivity. As a result, Ni-B/Al2O3 showed 91% of 1-octene selectivity at 99% of 1-octyne conversion.
