The Synthesis And Catalytic Performance Of Ni-Fe Bimetallic Catalyst

Although the nickel-iron bimetallic catalysts show good application prospects in the field of catalysis due to their special electronic structure and unique surface properties,there are still insufficient studies.In this paper,a series of carbon-loaded nickel-iron bimetallic catalysts were synthesized by simple,economic and efficient impregnation-reduction method and their application of biomass platform levulinic acid hydrogenation and electrocatalytic oxygen evolution were investigated.The paper has the following three parts:1.The Ni3Fe bimetallic catalyst(Ni3Fe NPs@C)was synthesized by a one-step carbon thermal reduction method and displayed bifunctional catalytic activity of direct hydrogenation(DH)and transfer hydrogenation(TH)of levulinic acid(LA)into ?-valerolactone(GVL),selectively.When the isopropanol was used as the solvent,the conversion of LA was 93.8%and the selectivity of GVL was 95.5%at 130 ?,2 MPa H2 and 2 h in the DH course;the conversion of LA was 99.7%and the selectivity of GVL was 99.5%at 180 ?,0.5 h and no external hydrogenation source condition in the TH course.Besides,the catalyst showed good recycling performance.Moreover,we also studied the relationship between catalytic performance and structure,and analyzed the specific path of DH and TH catalytic conversion of LA.2.Fe doped phosphate nickel nanostructures supported by biomass porous carbon((FexNi1-x)y)P/CNs was synthesized by phosphoric acid pretreatment and use cotton raw materials,its revealed excellent electrocatalytic oxygen evolution performance.Among them,the overpotential at 10 mA cm-2 and Tafel slope of(Fe0.25Ni0.75)i2P5/CNs catalyst were 131 mV and 37 mV dec-1,which were better than commercial RuO2,significantly.The relationship between structure and performance were investigated.In addition,the characterization of Mossbauer spectrum and synchrotron radiation spectrum showed that part of Fe2+ was transferred to a high state of Fe4+ in OER reaction process,incicating the unique synergy mechanism between Fe and Ni12P5.3.The structure and catalytic acitivity analysis of the synthesized nickel-iron bimetallic catalysts showed that the three-dimensional porous carbon-loaded nickel iron bimetallic catalyst had better catalytic performance.The obtained nickel iron bimetallic catalyst with N and P heteroatoms modified carbon as support showed higher catalyst activity and wider application,for instance,the phosphorus modified catalyst had excellent water phase hydrogenation catalyst performance.