首页>
外国专利>
Novel carbon nanotubes synthesis continuous process using iron floating catalysts and MgO particles for CVD of methane in a fluidized bed reactor
Novel carbon nanotubes synthesis continuous process using iron floating catalysts and MgO particles for CVD of methane in a fluidized bed reactor
展开▼
机译：在流化床反应器中使用铁浮催化剂和MgO颗粒进行甲烷CVD的新型碳纳米管合成连续过程
展开▼
页面导航
摘要
著录项
相似文献
摘要
A novel continuous process is used for production of carbon nanotubes (CNTs) by catalytic chemical vapor deposition (CCVD) of methane on iron floating catalyst in-situ deposited on MgO in a fluidized bed reactor. In the hot zone of the reactor, sublimed ferrocene vapors were contacted with MgO powder fluidized by methane feed to produce Fe/MgO catalyst in-situ. An annular tube was used to enhance the ferrocene and MgO contacting efficiency. Multi-wall as well as single-wall CNTs were grown on the Fe/MgO catalyst while falling down the reactor. The CNTs were continuously collected at the bottom of the reactor, only when MgO powder was used. The annular tube enhanced the contacting efficiency and improved both the quality and quantity of CNTs. The SEM and TEM micrographs of the products reveal that the CNTs are mostly entangled bundles with diameters of about 20 nm. Raman spectra show that the CNTs have low amount of amorphous carbon with IG/ID ratios as high as 10.2 for synthesis at 900° C. The RBM Raman peaks indicate formation of single-walled carbon nanotubes (SWNTs) of 1.0-1.2 nm diameter.
展开▼
机译：一种新颖的连续工艺用于通过在流化床反应器中原位沉积在MgO上的铁浮式催化剂上甲烷的催化化学气相沉积（CCVD）来生产碳纳米管（CNT）。在反应器的热区中，使升华的二茂铁蒸气与通过甲烷进料流化的MgO粉末接触，以原位生产Fe / MgO催化剂。使用环形管来提高二茂铁和MgO的接触效率。多壁和单壁CNT在Fe / MgO催化剂上生长，同时从反应器中掉落。仅当使用MgO粉末时，才在反应器底部连续收集CNT。环形管提高了接触效率，并改善了碳纳米管的质量和数量。产品的SEM和TEM显微照片显示，CNT主要是直径约20 nm的缠结束。拉曼光谱表明，碳纳米管的非晶态碳含量低，在900°C合成时I G / I D 比值高达10.2。RBM拉曼峰表明形成直径为1.0-1.2 nm的单壁碳纳米管（SWNT）。
展开▼
