化学学报 ›› 2000, Vol. 58 ›› Issue (11): 1336-1339. 上一篇    下一篇

研究论文

La~2NiO~4催化制备纳米碳管

梁奇;刘宝春;唐水花;李志杰;李庆;高利珍;张伯兰;于作龙   

  1. 中国科学院成都有机化学研究所.成都(610041)
  • 出版日期:2000-11-15 发布日期:2000-11-15

Carbon nanotubes growth catalyzed by La~2NiO~4

Liang Qi;Liu Baochun;Tang Shuihua;Li Zhijie;Li Qing;Gao Lizhen;Zhang Bolan;Yu Zuolong   

  1. Chengdu Inst Organ Chem, CAS.Chengdu(610041)
  • Online:2000-11-15 Published:2000-11-15

制备了四方结构复合氧化物La~2NiO~4,并以其为催化剂前体,甲烷和一氧化碳为碳,合成出大量高纯度的纳米碳管。XRD结果表明La~2NiO~4经还原后,在La~2O~3的隔离作用下Ni晶粒实现纳米级均匀分散。利用TEM,HRTEM,SEM,XRD,Raman等手段对所制备的纳米碳管进行了观察和表征。所制备的纳米碳管管径均匀、石墨化程度较高,该法制备纳米碳管工艺简单、产量较高,产品易于纯化。

关键词: 氧化镍, 氧化镧, 甲烷, 一氧化碳, 催化剂, X射线衍射分析, 透射电子显微术, 扫描电子显微镜

Ni-based A~2BO~4-type mixed oxide, La~2NiO~4, was prepared by means of a citric acid complexing method. X-ray diffraction pattern identified it as a single phase with a tetragonal K~2NiF~4 structure in which Ni^2^+ and La^3^+ ions were evenly distributed. It also indicated the nickel existed mainly as Ni^0 after reducing. Rare earth oxides, La~2O~3, could prevent transition metal from agglomerating and promote dispersion of nanoscale Ni^0 particles, which was very advantageous for carbon nanotube growth. A large amount of carbon nanotubes from catalytic decomposition of CH~4 and disproportionation of CO were obtained using La~2NiO~4 oxides as catalyst precursor. The morphology of the carbon nanotubes was examined by transmission electron microscopy(TEM) and scanning electron microscopy (SEM). High resolution transmission electron microscopy image and Raman spectrum of carbon nanotubes showed they were multi-walled nanotubes with a higher degree of graphitization.

Key words: NICKEL OXIDE, LANTHANUM OXIDE, METHANE, CARBON MONOXIDE, CATALYST, X-RAY DIFFRACTION ANALYSIS, TRANSMISSION ELECTRON MICROSCOPY, SCANNING ELECTRON MICROSCOPES

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