Vertically-aligned carbon nanotube membranes for hydrogen separation

Ge, Lei, Wang, Li, Du, Aijun, Hou, Meng, Rudolph, Victor and Zhu, Zhonghua (2012) Vertically-aligned carbon nanotube membranes for hydrogen separation. RSC Advances, 2 12: 5329-5336.

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Author Ge, Lei
Wang, Li
Du, Aijun
Hou, Meng
Rudolph, Victor
Zhu, Zhonghua
Title Vertically-aligned carbon nanotube membranes for hydrogen separation
Journal name RSC Advances   Check publisher's open access policy
Publication date 2012
Sub-type Article
DOI 10.1039/c2ra00031h
Volume number 2
Issue number 12
ISSN 2046-2069
Start page 5329
End page 5336
Total pages 8
Place of publication Cambridge, United Kingdom
Publisher RSC Publications
Collection year 2013
Language eng
Abstract 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.
Keyword Carbon nanotube membranes
Gas permeability
Hydrogen separation
Knudsen
Non-Knudsen transport
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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