Preparation of highly mesoporous carbon membranes via a sol–gel process using resorcinol and formaldehyde
Preparation of highly mesoporous carbon membranes via a sol–gel process using resorcinol and formaldehyde
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DOI：
10.1016/j.carbon.2008.03.007
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发表时间：
2008-06
期刊：
影响因子：
10.9
通讯作者：
M. Yoshimune;Takuji Yamamoto;M. Nakaiwa;K. Haraya
中科院分区：
文献类型：
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作者：
M. Yoshimune;Takuji Yamamoto;M. Nakaiwa;K. Haraya
本文报道了用间苯二酚和甲醛（RF）对溶胶-凝胶衍生的介孔聚合物膜进行热解制备高介孔碳膜的方法。通过改变间苯二酚与催化剂的摩尔比，制备了两个系列的射频碳膜。氮气吸附-解吸测试表明，RF碳膜具有发育良好的介孔结构，孔径控制在5.48nm和13.9nm。两种RF碳膜的氦和氮渗透率均与进料压力无关，表明没有粘性流动的贡献，膜初始无裂纹。气体渗透结果表明，气体通过两种RF碳膜的主要机制都是Knudsen扩散。对于ch4和CO2等可冷凝气体的渗透，观察到表面流动也对总渗透有贡献。
This paper reports the preparation of highly mesoporous carbon membranes, which are obtained by the pyrolysis of sol–gel derived mesoporous polymer membranes using resorcinol and formaldehyde (RF). Two series of RF carbon membranes were prepared by changing the resorcinol to catalyst molar ratio. The nitrogen adsorption–desorption measurement shows that the RF carbon membranes possess a well-developed mesoporous structure with controlled pore diameters of 5.48nm and 13.9nm. The helium and nitrogen permeances of both RF carbon membranes were independent of the feed pressure, indicating that there was no contribution of viscous flow and the membranes are initially crack-free. The gas permeation result showed that the dominant mechanism of gas transport through both the RF carbon membranes is Knudsen diffusion. With regard to the permeation of condensable gases such as CH4and CO2, it was observed that the surface flow also contributes to the total permeation.