引用本文:
吕德义, 徐铸德, 徐丽萍, 葛忠华. 碳纳米管的氧化稳定性及反应动力学[J]. 应用化学,
2002, 19(10): 1005-1007.
Citation: LÜ De-Yi, XU Zhu-De, XU Li-Ping, GE Zhong-Hua. Oxidation Stability of Carbon Nanotubes and Reaction Kinetics[J]. Chinese Journal of Applied Chemistry, 2002, 19(10): 1005-1007.
Citation: LÜ De-Yi, XU Zhu-De, XU Li-Ping, GE Zhong-Hua. Oxidation Stability of Carbon Nanotubes and Reaction Kinetics[J]. Chinese Journal of Applied Chemistry, 2002, 19(10): 1005-1007.
碳纳米管的氧化稳定性及反应动力学
摘要:
碳纳米管自被发现以来[1],已分别通过HRTEM[1]、Raman[2,3]、ED[4]、STM和STS[5]等对其结构、形态、层间距、直径分布、螺旋度、管壁及顶端的电子结构等物理性质进行了详细研究和表征。而碳纳米管在空气中的抗氧化性能的研究虽有文献报道,但关于纳米碳管氧化反应动力学的报道则相对较少[6~9]。由于作为催化剂载体是碳纳米管在化学领域最具潜在的应用之一,因此,研究碳纳米管在空气中的抗氧化性及氧化反应动力学是一项很有意义的工作。本文利用TG-DTA方法研究了碳纳米管在空气中的抗氧化性,同时与C60和石墨的实验结果进行比较,并根据三者结构上的差异解释了它们在抗氧化性能和热稳定性以及表观活化能和反应级数上的差异。
English
Oxidation Stability of Carbon Nanotubes and Reaction Kinetics
Abstract:
The oxidation stability and reaction kinetics of multi-wall carbon nanotubes(MWCNTs), graphite and C60 have been studied by TG-DTA techniques. The maximum mass losses were found at 673℃(carbon nanotubes), 846℃(graphite) and 628℃(C60), respectively, at a heating rate of 10℃/min. The apparent activation energy of the oxidation reaction of carbon nanotubes, graphite and C60 are E(MWCNTs)=143.5 kJ/mol、 E(graphite)=180.7 kJ/mol、 E(C60)=90.9 kJ/mol, respectively. The reaction order of the oxidation reaction of carbon nanotubes, graphite and C60 are n(MWCNTs)=3/5、n(graphite)=1/2、n(C60)=1/2, respectively. In conclusion, graphite has the best resistance to oxidation, but C60 the weakest.
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Key words:
- carbon nanotube
- / oxidation stability
- / kinetics
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