分别以具有相似Fe、Co、Ni含量的层状双金属氢氧化物(LDHs)为催化剂前体,用化学气相沉积的方法生长碳纳米管(CNTs).催化剂由LDHs焙烧还原得到.通过X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)及拉曼光谱(Raman)测试技术对LDHs及其焙烧产物的结构、CNTs的形貌和结构进行了研究.结果表明,3种催化剂生长的CNTs均为多壁结构;其中Co催化剂活性较低,生长CNTs的管径较细、石墨化程度较高;Ni催化剂的活性较高,生长CNTs的密度较大、管壁较厚、石墨化程度较差;Fe催化剂的活性介于Co和Ni之间.催化剂活性及CNTs的密度可以由生长CNTs的结构来解释.
Using hexane as source material, carbon nanotubes(CNTs) were grown by chemical vapor deposition process on layered double hydroxides(LDHs) containing similar amounts of iron, cobalt or nickel as catalysts. Catalysts were obtained by calcination of LDH precursors followed by reduction. The materials were characterized by X-ray diffractometry, scaning electron microscopy, transmission electron microscopy and Raman spectroscopy. The results indicated that all CNTs exhibited are multi-walled CNTs. The activity order of these three catalysts is nickel＞iron＞cobalt. The CNTs grown on cobalt catalyst have a smaller diameter and contain more graphite, while the CNTs grown on nickel catalyst have a higher density, a thicker wall and less graphite. The activity of catalyst and density of CNTs mainly could be interpreted from on the structure of CNTs.
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