It is necessary to study the controllable preparation of carbon nanotubes(CNT) by flame method to realize the mass production of CNT by existing industrial equipment such as coal-fired boilers.α-Al2O3 was used as catalyst carrier,the catalysts were prepared by impregnation method,and prepared CNT by V-type flame burner.The morphology and graphitization degree of the products were characterized by scanning electron microscopy (SEM) and Raman spectroscopy separately to analyze the effects of catalysts on the morphology and properties of the products.The physical and chemical properties of the catalysts were characterized by X-ray diffraction,N2 adsorption and desorption,and hydrogen temperature programmed reduction to analyze the catalytic mechanism.The results shown that:the new catalysts FeNiCr and CoFeCr can synthesize a large number of CNT clusters.Chromium was not suitable as the active component,but played a role of dispersant to promote the formation of CNT clusters.As the pore volume and pore size of catalyst increased,the yield of CNT clusters raised.Compared with nickel,iron and cobalt were more suitable as the active component of polybasic catalysts to easily prepare pure and high-quality CNT.
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