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流化床CVD法制备单壁碳纳米管:反应温度与时间的影响

Synthesis of single-walled carbon nanotubes by chemical vapor deposition of methane in a fluidized bed reactor: temperature and reaction time effects

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【作者】 张群峰余皓罗国华骞伟中魏飞

【Author】 ZHANG Qun-feng, YU Hao, LUO Guo-hua, QIAN Wei-zhong, WEI Fei (Beijing Key Laboratory of Green Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China)

【机构】 清华大学化工系绿色反应工程与工艺北京市重点实验室清华大学化工系绿色反应工程与工艺北京市重点实验室 北京100084北京100084

【摘要】 基于负载法Fe-MgO体系催化剂研究了化学气相沉积(CVD)法在流化床反应器中反应温度和时间对单壁碳纳米管(SWCNTs)生长的影响。通过气相色谱对尾气进行实时在线分析,获得了CH4在反应过程中的转化率随时间的变化规律。并对不同反应温度和反应时间所获产品进行了TEM、Raman和TGA等表征。结果表明,900℃是最佳的反应温度,反应温度过低会降低催化剂活性,反应温度过高则容易使催化剂过快失活。在合适的反应温度下,反应前10min催化剂的平均活性较高,能够得到较高质量的SWCNTs,10min后催化剂基本失活。

【Abstract】 The effect of temperature and reaction time on the growth of SWCNTs was investigated in a lab-scale fluidized bed reactor using Fe/MgO as catalyst for the easy purification of the as-grown product. Methane was used as the carbon source and online gas chromatography was used to obtain the real-time conversion of methane. The products were characterized by TEM, TGA and Raman spectroscopy. It is found that a low reaction temperature leads to a low activity of the catalyst, while a high temperature increases the deactivation of the catalyst. The optimum temperature was found to be 900℃. High quality SWCNTs were formed within ten minutes and amorphous carbon was found for a longer reaction time.

【基金】 国家自然科学基金(200236020);国家863项目(2003AA302630)。~~
  • 【文献出处】 新型炭材料 ,New Carbon Materials , 编辑部邮箱 ,2006年04期
  • 【分类号】TB383.1
  • 【被引频次】3
  • 【下载频次】539
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