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中文摘要：
采用成核晶化隔离法将Co^2＋引入层状双金属氢氧化物（LDHs）,得到了含不同Co^2＋/Al^3＋物质的量的比为1∶1,2∶1,3∶1的二元钴铝碳酸根型LDHs（CoAl-LDHs）。通过X射线衍射（XRD）、透射电镜（TEM）、扫描电镜-能量散射谱（SEM-EDS）、拉曼光谱（Raman）、程序升温还原（TPR）及X射线光电子能谱（XPS）等方法对CoAl-LDHs焙烧产物的结构、组成及其化学气相沉积（CCVD）催化生长多壁碳纳米管（CNTs）进行了研究。结果表明：CoAl-LDHs前体中钴的含量可以明显改变焙烧产物的组成分布和还原性能,并最终影响CNTs的生长,其中以nCo^2＋/nAl^3＋比为2/1的LDHs作为催化剂前体可以得到管径均匀和石墨化程度高的CNTs,这与还原得到的纳米活性Co颗粒均匀分散有关。
英文摘要：
Multi-walled carbon nanotubes （CNTs） were prepared via catalytic chemical vapor deposition （CCVD） of acetylene over a series of Co-containing mixed metal oxides obtained by calcination of layered double hydroxides （LDHs） precursors with Co^2＋/Al^3＋ molar ratios ranging from 1∶1 to 3∶1. The materials were characterized by means of XRD, TPR, XPS, SEM-EDS, TEM and Raman spectroscopy. The results indicate that the cobalt content in precursor has a significant effect on the structure and composition of calcined LDHs and thus the growth of CNTs. Furthermore, it is found that the precursor with the Co^2＋/Al^3＋ molar ratio of 2.0 gives rise to much more uniform CNTs with higher graphitization due to the more uniform dispersion of active metallic Co nanoparticles obtained by reduction of calcined products.
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