Study On The Synthesis And Application Of N-doped Porous Carbon Materials

Due to the controllable pore structure and surface chemical properties, porouscarbon materials are widely used on catalysis, absorption, sensor, electrochemistry etal. Doping and modification can be effective means to improve the performance ofporous carbon material. Nitrogen is an ideal doped element for carbon materials, andnitrogen doping can improve the physical, chemical properties of prous carbonmaterials. In this paper, series of N-doped porous carbon materials were synthesizedusing template methods, and the synthetic mechanisms were proposed. The catalysisof synthetic N-dopped materials for selective hydrogenation of nitrobenzene to aniline,and absorption of SO2were studied.Firstly, N-doped carbon materials with mesoporous structure were synthesizedby a one-step assembly synchronization template method using traditional ionic liquid(ILs) as the carbon and nitrogen sources. Through investigating the structure andcomponents of the materials, a possible synthesis mechanism was proposed and thefunctions of ILs as carbon source and structure-derecting agent of template werestudied. The catalytic properties for selective hydrogenation of nitrobenzene to anilinewere studied, and the results show that the prepared carbon material has a goodcatalytic activity with selectivity and conversion reaching97%and88.6%,respectively. The catalytic reaction mechanism on the N-dopped porous carbonmaterials was investigated.N-doped carbon fiber arrays with mesoporous structure were successful preparedusing AAO as template and the traditional ILs as the carbon and nitrogen sources. Theeffect of TOES to modulate the pore volume and pore size was studied and thepossible synthetic mechanism for the carbon fibers array was proposed. Theabsorption properties for SO2were tested, and the results show that the bimodalmesoporous carbon fibers array has a favorable desulfuration performance, and itsadsorption capacity is equal to the reported active carbon fibers （ACFs）.In order to reduce the cost of carbon materials and raise N content, SBA-15andcheap melamine were used as template and carbon and nitrogen sources to synthesizethe meso-macroporous carbon materials with high nitrogen content. Thepolymerization and carbonization mechanisms for the melamine formaldehyde resinwere discussed. The synthesis method using cheap melamine with high-content nitrogen as the raw materials, realizes the in-situ doping of N, simplified the synthesissteps and reduced the cost. The prepared carbon materials were tested for theadsorption of SO2. The role of N in the carbon materials was studied. The resultsindicated that the adsorption capacity for SO2is much higher than that of thecommercial ACFs.High nitrogen content of meso-macroporous carbon materials were preparedusing more inexpensive silica spheres as templates and melamine as carbon andnitrogen sources. The adsorption properties of the prepared carbon materials for SO2and its surface adsorption mechanism were studied. The effect of the surface nitrogen,oxygen and other elements for the adsorption properties were discussed.