Reparation And Characterization Of Amorphous Co-Ni-B/γ-Al₂O₃Catalyst

Amorphous alloys have special physical and chemical properties for their unique spatial structure and uniformity of composition. Because of the metastability of thermodynamically with high surface energy, amorphous alloys have higher activation energy than crystalline alloy, and also have superior activity, high selectivity and good anti-poisoning ability in a catalytic reaction. There are so many types and inexpensive catalysts for the preparation and simple preparation methods of amorphous alloys with only a little environmental pollution, low energy consumption and high utilization rate of atomic. It is a new green chemical material.In this paper, the Co-Ni-B/γ-Al2O3amorphous alloy catalyst was prepared by impregnation-reduction method. As the liquid phase hydrogenation of furfural to furfuryl alcohol as a probe reaction. Investigated the influence of preparation conditionson to catalytic activity and selectivity, such as:loading quantity, molar ratio of Co/Ni, dipping time and calcination temperature. The catalyst’s properties was characterized by the X-ray Diffraction(XRD), Differential Scanning Calorimetry(DSC), Transmission Electron Microscopy(TEM), Selected Area Electron Diffraction(SAED), X-ray Photoelectron Spectroscopy(XPS), Specific Surface Area(BET), Temperature-Programmed Desorption(TPD) and Temperature-Programmed Reduction(TPR). The results shown that optimal conditions of preparation Co-Ni-B/γ-Al2O3amorphous alloy catalyst are30%metal atoms loaded, Co/Ni=9/1,24hours dipping and100℃drying, and in the reaction conditions: furfural/ethanol=1/1,3Mpa hydrogen gas pressure,100℃reaction temperature,2000rpm stirring speed, the catalyst have the highest activity and selectivity,50.72%furfural conversion rate and98.47%furfuryl alcohol selectivity. It Found that the Co-Ni-B/γ-Al2O3has better amorphous structure and higher thermal stability than Co-Ni-B by characterization. There is a strong interaction between Co-Ni-B amorphous alloys and carrier by the XPS analysis. That cause supported catalyst can improve its thermal stability and catalytic activity.