Solid-phase Synthesis, Characterization And Catalytic Properties Of Carbon Nanotubes

Since carbon nanotubes(CNTs)have been discovered in 1991,they have become to be a focus of attention in nano-technology for their unique physics and chemistry characters and special tube structure made of graphite flakes. There are some preparation methods, such as arc discharge method, laser ablation, chemical vapor deposition technique etc. With the progress of production and application technics of CNTs, people find there are some challenges. One hand, the complexes synthetic technique of traditional methods limited their large scale production. On the other hand, the areas of application are limited for their nanosize. Thus, it is valuable to synthesize CNTs with regular morphology by a simple, cheap and effective method.From the model calculate and experiment, people can conclude that CNTs can selective adsorb and activise some molecule due to its nanosize inner diameter, the net of six carbon ring similar with graphite and a great deal of unpaired electrons. Researcher reported that the catalytic activity and stabilization of CNTs was much higher than rhodium on decomposing NO at 873K.That is to say the catalytic activity of CNTs similar with the noble metal. At present, the application of CNTs is limited in catalytic reaction, which is mostly applied in oxidative dehydrogenation of ethylbenzene to styrene. If you can use CNTs replace of the noble metal as catalyst, you will bring a reform for petrifaction industry.In the thesis, the history, morphologies, structures, physical properties, application, preparation methods and growth mechanism of CNTs were reviewed. Herein, we synthesize CNTs with magnetism and sphere by carbonization an industrial ion exchange resin with ferricyanide, which are characterized by X-Ray powder diffraction (XRD),scan electron microscope(SEM), transmission electron microscope (TEM),Raman spectroscopy and N2 adsorption. The characterization show that, the sample keeps the similar sphere morphology to the ion changed resin, the surface of the sample consist of graphite multi-walled CNTs, and the sample can be magnetically motive for its magnetism. The specialty of the method is to synthesize multi-walled CNTs with regular morphology by a simple, cheap method.The prepared sample shows the high yield and selectivity on oxidative dehydrogenation of ethylbenzene to styrene. The sample is easily separated from reaction system for its magnetic property. More importantly, the prepared material show long catalytic life for its high graphite.In this thesis, we provide a novel route for synthesis of CNTs. it greatly reduces the production cost of CNTs and predigest prepared technics. These will increase their prospect of industry.