化学气相沉积法低温制备氢气和多壁碳纳米管

Low temperature preparation of hydrogen and multiwalled carbon nanotubes by CVD

采用低温化学气相沉积法裂解乙醇协同制备氢气和多璧碳纳米管,乙醇作为碳源,Ni/C用作催化剂。考察反应温度和Ni/C比例对氢气的产率和碳纳米管品质的影响。多壁碳纳米管结构与组成通过扫描电镜、投射电镜和X射线粉末衍射进行表征。结果表明:Ni/C催化剂最佳Ni担载量为8%,最佳的反应温度为500℃,最佳条件下氢气的产率为79%,碳纳米管的品质最佳。

Hydrogen and multi-walled carbon nanotubes(MWCNTs)were synthesized by low-temperature thermal chemical vapor deposition with ethanol as carbon sources and Ni/C as catalyst.The effects of the ratio of Ni to C and reaction temperatures on ethanol decomposition were investigated systematically.The structure and composition of the achieved MWCNTs products were studied by scanning and transmission electron microscope(SEM and TEM)as well as Raman and X-ray diffraction.The results indicate that Ni/C mass ration of 8%is the most effective catalyst for ethanol decomposition into hydrogen(the maximum H2 yield of 79%)and multi-walled carbon nanotutes at 500℃.