Synthesis And Catalytic Properties Of Porous Carbon Based Composite Materials

Porous carbon materials with nanosized structure, narrow pore size distribution, and large surface area have shown charming potential application in gas separation, water purification, and catalyst support. However, wide application of porous carbon materials is still facing challenge because of the difficult separation of nanosized carbon particles from the system, the difficult synthetic conditions for the use of hard templates, and limitation in large scaled synthesis. Recently, the functionality of porous carbon materials is becoming important. Thus, it is valuable to synthesize functional porous carbon materials with regular morphology by a simple and cheap method.On the other hand, transition metal carbides and nitrides have been widely applied in many fields for their special characters. Especially, these materials show the similar activity to rare metal in series of catalytic reactions. However, the conventional synthetic method only leads to the carbide and nitride with low surface area. It is desirable to synthesis of new porous carbon-based functional materials by combination of porous carbon materials with nitride and carbide.We demonstrate here a unique, facile, and controllable route for the synthesis of porous sphere composite by carbonization of ion charged resin with inorganic salt .Porous VN/C composite is synthesized by carbonization of anion charged resin D201 with inorganic salt of sodium metavanadate. These samples show the similar morphology to the ion charged resin. The inner sides are macroporous, and VN nanosized particles of 80-100 nm are highly dispersed in sample. Exposure in the air leads to the appearance of VO2 on the surface of VN nanosized particles because of oxidation . These VN particles with VO2 on their surface show high activities and selectivities in the epoxidation of styrene. Also high activities in the oxidation of cyclohexene.Another porousβ-Mo2C composite sphere is prepared by carbonization of the anion charged resin with molybdate. Characterizations indicate the sample shows the similar sphere morphology to the resin, the hierarchical microporous and macroporous structure, and large surface area.The nanosizedβ-Mo2C crystals are highly dispersed in the outer layer of the carbon-based sample. Further more, the surface morphology and pore structure of the sample can be controlled by changing the synthetic temperatures.Further more, we synthesize MS/C (M represent transition metal ) composites by carbonization of cation charged resin with inorganic salt.In conclusion,this is a unique, facile and universal route for the synthesis of carbon-based sphere composite .