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首页> 外文会议>International Symposium on Metastable and Nano-Materials(ISMANAM-2005); 20050703-07; Paris(FR) >Carbon fiber formation on Pd and Ni catalysts by acetylene decomposition
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Carbon fiber formation on Pd and Ni catalysts by acetylene decomposition

机译：乙炔分解在Pd和Ni催化剂上形成碳纤维

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摘要

In this study, carbon fibers were formed from acetylene decomposition on hydrogen-reduced Pd and Ni catalysts at 450-700℃. X-ray diffraction (XRD) was used to examine the crystal characteristics of catalysts and carbon fibers. The carbon fibers were also examined both by scanning electron microscopy (SEM) and Raman spectroscopy to define their appearance and structure. Little amount of carbon fibers were found on the Pd catalyst surface at 450℃; while a significant amount of carbon filaments were observed at 650℃. In comparison, more carbon filaments were observed on the Ni catalysts at 450℃. According to the XRD spectrum, there was carbon and graphite present on the Ni surface. Raman spectroscopy revealed two peaks at 1290cm~(-1) (D band, disorder mode, amorphous carbon) and 1590cm~(-1) (G band, graphite sp~2 structure). SEM results indicated the Ni could catalyze the C_2H_2 decomposition to form carbon filaments at a lower temperature than Pd. Furthermore, C_2H_2 was decomposed on Ni catalyst at 450℃; the formation of carbon nanotubes by decomposing C_2H_2 on Ni at 450℃ was a relatively low temperature.
机译：在这项研究中，碳纤维是由乙炔在450-700℃的氢气还原的Pd和Ni催化剂上分解而形成的。 X射线衍射（XRD）用于检查催化剂和碳纤维的晶体特性。还通过扫描电子显微镜（SEM）和拉曼光谱检查碳纤维，以定义其外观和结构。在450℃的Pd催化剂表面发现很少的碳纤维; 650℃时观察到大量碳丝。相比之下，在450℃的Ni催化剂上观察到更多的碳丝。根据XRD谱图，Ni表面上存在碳和石墨。拉曼光谱法在1290cm〜（-1）（D波段，无序模态，无定形碳）和1590cm〜（-1）（G波段，石墨sp〜2结构）出现了两个峰。 SEM结果表明，Ni可以在比Pd低的温度下催化C_2H_2分解形成碳丝。此外，C_2H_2在450℃的Ni催化剂上分解。在450℃Ni上分解C_2H_2形成碳纳米管的温度较低。

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