The Synthesis And Catalytic Properties Of MOFs-derived Porous Carbon Composite Materials

Metal-Organic Frameworks（MOFs）are compounds consisting of metal ions or clusters coordinated to organic ligands to form porous crystalline materials,which feature large surface area,high porosity and adjustable pore size.Recently,preparation of metal/metal oxide and porous carbon composite materials by pyrolysis of precursors of MOFs has attracted much attention of researchers.In this paper,two series of nanocomposites were prepared by using different MOFs as precursors.The Influence of the pyrolysis temperature on morphology,pore structure and catalytic performance were also studied.In the first chapter,we introduced the research background of MOFs materials and MOFs as precursors to synthesize porous carbon composite material.In addition,the applications of p-nitrophenol reduction of porous carbon composite material were briefly reviewed.In the second chapter,Co-MOF-1（Co₆（btb）₄（4,4’-bipy）₃×44（DMA））was synthesized by H₃BTB,4,4’-pyridine and cobalt salt.This MOF was pyrolyzed at different temperatures（600^oC and 700^oC and 800^oC and 900^oC）to obtained Co/Co₃O₄@nitrogen doped porous carbon materials.The composites were characterized by PXRD,X-ray Photoelectron Spectroscopy,transmission electron microscope and gas adsorption.In addition,the above four composite materials were studied for the reduction of p-nitrophenol,and the catalytic performance was discussed.In the third chapter,aseries of MOFs,[（CH₃）₂NH₂]₆[Co（H₂O）₆]₃{Co₆（h₆-TATAT）₄（H₂O）₁₂}(Co-MOF-2,[（CH₃）₂NH₂]₆[Ni（H₂O）₆]₃{Ni₆（h₆-TATAT）₄（H₂O）₁₂}（Ni-MOF-2）and CoNi-MOF-2（Co:Ni=1:1）have been synthesized.These MOFs were pyrolyzed at 800^oC to obtained nitrogen doped porous carbon materials.These composites were characterized by PXRD,SEM and Raman.Three nitrogen-doped porous carbon materials loaded with different metal nanoparticles were studied for the reduction of p-nitrophenol,and the catalytic performance was discussed.In the fourth chapter,we summarize the work of the synthesized composites and catalytic performance of p-nitrophenol reduction.Among them,Co-MOF-1 as the precursor through pyrolysis getting Co/Co₃O₄@C800 have uniform dispersion of Co/Co₃O₄ nanoparticles,large specific surface area,and own the best catalytic performance for reduction of p-nitrophenol.MOF-2 as the precursor through pyrolysis getting Co@C800 own the best catalytic performance for reduction of p-nitrophenol.In the cycle experiments,cycle stability of these catalysts are excellent.