Vertically-aligned carbon nanotube membranes for hydrogen separation
Vertically-aligned carbon nanotube membranes for hydrogen separation
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DOI：
10.1039/c2ra00031h
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发表时间：
2012-01-01
期刊：
影响因子：
3.9
通讯作者：
Zhu, Zhonghua
中科院分区：
文献类型：
--
作者：
Ge, Lei;Wang, Li;Zhu, Zhonghua
制备了垂直取向的碳纳米管膜，并对其进行了表征，测量了相应的气体渗透率和氢气分离率。通过改变混合前体中的催化剂蒸气浓度（Fe/C比）来调节碳纳米管直径和面密度。渗透率比Knudsen预测高一到两个数量级，而气体选择性仍在Knudsen范围内。研究了直径和面密度对渗透的影响，并对渗透的温度依赖性进行了讨论。结果证实了非努森输运的存在，表面吸附扩散可能会影响相对低温下的总渗透率。定向碳纳米管膜的透过率可以通过增加面密度和在最佳温度下操作来提高。
Vertically-aligned carbon nanotube membranes have been fabricated and characterized and the corresponding gas permeability and hydrogen separation were measured. The carbon nanotube diameter and areal density were adjusted by varying the catalyst vapour concentration (Fe/C ratio) in the mixed precursor. The permeances are one to two magnitudes higher than the Knudsen prediction, while the gas selectivities are still in the Knudsen range. The diameter and areal density effects were studied and compared, the temperature dependence of permeation is also discussed. The results confirm the existence of non-Knudsen transport and that surface adsorption diffusion may affect the total permeance at relative low temperature. The permeance of aligned carbon nanotube membranes can be improved by increasing areal density and operating at an optimum temperature.