Preparation And Catalytic Study Of Small Size Metallic Nanoparticles Limited Growth In Metal Organic Framework

As a new type of porous material,metal-organic framework?MOF?has shown high porosity,structural adjustment and high stability characteristics.It has been applied in an extremely wide range from catalysis,drug delivery,gas storage et al.Obviously,to further design and synthesis of composite materials combined with the advantages of the metal organic framework has been a hot research direction.In this work,we mainly use porphyrin-based metal-organic framework materials as precursors.And then treated with other methods and obtained a series of composite carbon materials and supported nanocomposites.The composite materials were characterized through single crystal X-ray diffractions,high revolution transmission electron microscopy?HRTEM?,Powder X-ray diffraction?XRD?and IR spectra et al.Electrocatalytic oxygen reduction and catalytic properties of hydrogenation continued to be studied based on these composite materials.1.Compound of In-Fe?TCPP??1?was obtained by reaction of the In³⁺,Fe³⁺and containing nitrogen and carboxyl groups porphyrin ligands under the solvothermal condition.The structure is a two-dimensional layer interpenetrating porous material with three-dimensionaltopologicalstructure.Moreover,In-In?TCPP?-MOFand In-Co?TCPP?-MOF reported in the literature were synthesized by removing the porphyrin metal center and replacing the porphyrin metal center species.And then,the synthesized MOF precursors were calcinated at different temperature to produce In/NC-700,In-Fe/NC-700,In-Co/NC-700,In-Fe/NC-1000,In-Co/NC-1000.Meanwhile,their electrochemical oxygen reduction properties have been studied under alkaline conditions.2.Under the irradiation of visible light,platinum salt was reduced by alternating light exposure and light protection using a photosensitive metal-organic framework PCN-221.We successfully controlled growth of Pt nanoparticles,a composite material Pt@PCN-221 loaded with small-size uniformly dispersed Pt nanoparticles was synthesized.Multiple supported nanocomposites were obtained via different platinum concentrations and different periods of exposure and light protection.?1?Pt@MOF-5C series:Pt@MOF-5C-2h,Pt@MOF-5C-1h,Pt@MOF-5C-20min.?2?Pt@MOF-10C series:Pt@MOF-10C-1h,Pt@MOF-10C-2h,Pt@MOF-10C-3h.And do the research on hydrogenation cinnamaldehyde activities of these Pt@MOF-5C composite materials.?3?PCN-221 was immersed in metal nitrate for metallization and then loaded with Pt nanoparticles to prepare four composites.Pt@MOF-Ni-5C-1h,Pt@MOF-Ni-5C-2h,Pt@MOF-Co-5C-1h,Pt@MOF-Co-5C-2h.?4?PCN-221,Pt@MOF-5C,Pt@MOF-10C and complexes of post-metallized reload platinum through thermal treatment,ten carbides are obtained:NC,Pt@C-5C-20min,Pt@C-5C-1h,Pt@C-5C-2h,Pt@C-10C-1h,Pt@C-10C-2h,Pt@C-10C-3h,Pt@C-Co-5C-1h,Pt@C-Co-5C-2h,Pt@C-Ni-5C-1h,Pt@C-Ni-5C-2h,respectively.The electrocatalytic hydrogen production properties of the above composite carbon materials have been studied.