含钴介孔分子筛催化热解乙醇制备纳米碳管

以CTAB为模板剂,硅酸钠、氯化钴为原料,通过水热法合成含钴介孔分子筛(Co-MCM-41)。以所合成的Co-MCM-41做催化剂,采用化学气相沉积(CVD)法催化热解乙醇制备纳米碳管。通过XRD、FT-IR、TEM、N2吸附-脱附和Raman光谱等分析手段对所合成的介孔分子筛和纳米碳管进行了表征。结果表明:合成的Co-MCM-41样品具有MCM-41的介孔结构,比表面积较大且介孔有序性较好。以所合成的含钴介孔分子筛催化热解乙醇制备出管径均匀、管壁较厚、顶端开口的多壁纳米碳管。

Preparation of carbon nanotubes by ethanol pyrolysis using Co-containing mesoporous molecular sieve as catalyst

Co-MCM-41mesoporous molecular sieves were synthesized by hydrothermal method using cetyltrimethyl ammonium bromide as template and sodium silicate and cobalt chloride as raw materials,respectively.Carbon nanotubes(CNTs)were synthesized by chemical vapor deposition(CVD)method using the Co-MCM-41 as a catalytic template by the pyrolysis of ethanol at atmospheric pressure.The physicochemical properties of the obtained samples were characterized by X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FT-IR),transmission electron microscopy(TEM),N2 physical adsorption and Raman spectroscopy,respectively.The results show that the Co-MCM-41 samples possess a typical mesoporous framework of MCM-41.These mesoporous materials have high specific surface area and good mesoporous ordering.The open-ended and high purification CNTs with uniform diameter and thicker wall were successfully synthesized.