摘要
以水溶性NaCl担载Fe作催化剂,于400℃和420℃下化学气相沉积法催化裂解乙炔进行了反应。通过X射线衍射仪、扫描电子显微镜和能谱分析仪对催化剂进行了表征,表征结果显示:活性组分Fe被分散成了粒径在10～40 nm之间的纳米颗粒;通过扫描电子显微镜和高分辨透射电镜对产物进行了表征,表征结果显示:当裂解温度为400℃时,主要产物为直径在20～50 nm之间,基本具有清晰同心石墨壳层结构的内包铁NOLFs,同心石墨壳层的层间距约为0.348nm,产物中没有碳纳米管出现;当裂解温度为420℃时,主要产物为直径在10～40 nm之间结构呈绳结状的碳纳米管,其石墨壳层不是十分规整,石墨化程度较低。
Nano-carbon materials were synthesized by the catalytic decomposition of acetylene at 400 ℃ and 420 ℃ in a chemical vapor deposition process using iron supported on sodium chloride as catalyst.The catalyst was examined by X-ray diffraction,scanning electron microscopy and energy dispersive spectroscopy.The results show that the active composition iron was dispersed into nanoparticles with diameters in the range 10-40 nm on the surface of NaCl support successfully.The products were examined by scanning electron microscopy and high resolution transmission electron microscopy.The results show that nano onion-like fullerenes encapsulating Fe cores with diameters in the range 20-50 nm were obtained when the reaction temperature was 400 ℃ and there were no carbon nanotubes in the product.These onion-like fullerenes are composed of concentric graphene layers with an interlayer distance of 0.348 nm between the layers.When the reaction temperature was 420 ℃,carbon nanotubes with a structure of rope were obtained and the graphitization degree of these carbon nanotubes was not high due to the low reaction temperature.
出处
《化学研究与应用》
CAS
CSCD
北大核心
2011年第8期1075-1077,共3页
Chemical Research and Application
关键词
氯化钠
乙炔
化学气相沉积法
纳米碳材料
Sodium chloride
Acetylene
Chemical vapor deposition
Nano-carbon materials
