Controllable Synthesis And Catalytic Properties Of Composite Nano Catalyst With Spatially Confined Pt Nanoparticles

Due to their good stability and activity,the core-shell catalysts with spatially confined noble metal nanopartices have become a promising catalyst in liquid-phase catalysis.When the inner core is inorganic matter and the shell is organic matter,the shell material possess abundant functional groups and its chemical structure is adjustable,which makes it possible to control the performance of the catalyst.However,for the core-shell catalysts with spatially confined noble metal nanopartices mentioned above,the inorganic core,the noble metal nanoparticles and the organic shell material exhibit poor compatibility because of their different surface properties.Moreover,the synthesis method is usually complicated,and the size of noble metal nanoparticles is large which lower the catalyst activity of the catalysts.Therefore,it is still a challenge to develop small size,high activity core-shell catalysts with spatially confined noble metal nanopartiles by a simple method.A one-step redox deposition synthesis strategy is proposed to synthesize core-shell catalysts with spatially confined noble metal nanopartices.Firstly,the polyvinyl pyrrolidone（PVP）was absorbed on the surface of Fe₂O₃by the hydrogen bond,Fe³⁺produced by partial dissolution of ferric oxide,and the surface modified PVP induce the adsorption of EDOT on the surface of ferric oxide,the monomer EDOT was oxidated by K₂Pt Cl₄and Fe³⁺,so that PEDOT and Pt are simultaneously deposited on the inner core ferric oxide,and finally a small size core-shell catalysts with spatially confined noble metal nanopartices Fe₂O₃@PEDOT/Pt was successfully synthesizad.Pt nanoparticles are confined in the shell of the conductive polymer PEDOT,and the interaction of Pt and S makes platinum nanoparticles possess higher stability.In addition,small size platinum nanoparticles and ultra-thin shell layer endow the catalyst high activity.The nano-composite catalyst exhibits high activity and stability in the reduction reaction of nitro compounds.The synthesis method is relatively simple and easy to repeat,and is a simple method for preparing small size,high activity core-shell catalysts with spatially confined noble metal nanopartiles.A one-step redox deposition synthesis strategy is used to synthesize core-shell catalysts with spatially confined noble metal nanopartices.Firstly,the polyvinyl pyrrolidone（PVP）was absorbed on the surface of Fe₂O₃by the hydrogen bond Fe³⁺produced by partial dissolution of ferric oxide,and the surface modified PVP induce the adsorption of Py on the surface of ferric oxide,the monomer Py was oxidated by K₂Pt Cl₄and Fe³⁺,so that PPy and Pt are simultaneously deposited on the inner core ferric oxide,and finally a small size core-shell catalysts with spatially confined noble metal nanopartices Fe₂O₃@PPy/Pt was successfully synthesizad.Pt nanoparticles are confined in the shell of the conductive polymer PPy,and the interaction of Pt and N makes platinum nanoparticles possess higher stability.In addition,small size platinum nanoparticles and ultra-thin shell layer endow the catalyst high activity.The nano-composite catalyst exhibits high activity and stability in the reduction reaction of nitro compounds.The one-step redox deposition synthesis strategy can be extended to the design and synthesis of other polymer-based core-shell shell catalysts with spatially confined noble metal nanopartiles.