Influence of Iron Additive on the Hydrogen Separation Properties of Carbon Molecular Sieve Membranes
Influence of Iron Additive on the Hydrogen Separation Properties of Carbon Molecular Sieve Membranes
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DOI：
10.1021/acs.iecr.7b05265
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发表时间：
2018-04-18
影响因子：
4.2
通讯作者：
Kita, H.
中科院分区：
文献类型：
--
作者：
Kumakiri, I.;Tamura, K.;Kita, H.
以木质素基材料有机溶胶木素和酚醛树脂Bellpeal-S899为前驱体，在多孔陶瓷管外表面制备了碳分子筛膜。较高的热解温度使氢的选择性高于氧气或其他较大的气体，但氢的渗透率显著降低。相反，在前驱体中加入少量的碱性醋酸铁提高了氢的选择性，但保持了氢的渗透性。在前驱体中添加铁化合物大大降低了氮气和甲烷通过所得到的CMS膜的渗透率。用透射电子显微镜、能量色散X射线能谱(TEMEDS)和电子探针(EPMA)分析了铁在碳基质中的分布。研究了老化对膜透过率的影响。结果表明，使用添加剂可以调节CMS膜中超微孔的大小。
Carbon molecular sieve (CMS) membranes were prepared on the outer surface of porous ceramic tubes using a lignin-based material, organosolvelignin, and a phenol resin, Bellpeal-S899, as precursors. Higher pyrolysis temperature resulted in higher hydrogen selectivity over oxygen or other larger gases, but hydrogen permeance decreased significantly. On the contrary, addition of a small amount of iron(III) acetate basic to the precursors improved the hydrogen selectivity but maintained the hydrogen permeance. Addition of iron compound to the precursor strongly reduced the permeances of nitrogen and methane through the resulting CMS membranes. Distribution of iron in the carbon matrix was evaluated by transmission electron microscopy energy dispersive X-ray spectroscopy (TEM-EDS) and electron probe microanalyzer (EPMA). The influence of aging on the membrane permeance was also studied. The results suggest the possibility to tune the size of ultra-micro-pores in CMS membranes using additives.