Evaluation of cellulose-derived carbon molecular sieve membranes for hydrogen separation from light hydrocarbons

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• 作者：David Grainger ; May-Britt H&#xe4 ; gg
• 关键词：Carbon ; Membrane ; Hydrogen ; Hydrocarbon ; Process
• 刊名：Journal of Membrane Science
• 出版年：2007
• 期刊代码：55_03767388
• 类别：ch
• 出版时间：1 December 2007
• 卷：306
• 期：1-2
• 页码：307-317
• 文件大小：1162 K

摘要

Carbon molecular sieve membranes derived from cellulose–hemicellulose have been evaluated for hydrogen separation from light hydrocarbons. Copper(II) nitrate was added to the precursor in the range of 0–6 wt%, resulting in increased hydrogen/methane permselectivity at the expense of permeability. Carbonization temperature was varied from 400 to 700 °C, with the best performance for membranes produced between 550 and 650 °C. Mixed gas tests with H₂, CO₂, C₁–C₄ and N₂ showed that these membranes tolerate light hydrocarbons and separated hydrogen with a permeability of about 480 Barrer and hydrogen/methane permselectivity >1000. Hydrogen/carbon dioxide permselectivity was found to be approximately 23 at 25 °C. Transport was activated and an increase of 65 °C doubled the mixed gas hydrogen permeability. Performance was strongly influenced by exposure to air.