On the preparation of supported nanoporous carbon membranes
On the preparation of supported nanoporous carbon membranes
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DOI：
10.1016/s0376-7388(00)00513-5
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发表时间：
2000-11
影响因子：
9.5
通讯作者：
M. Shiflett;H. C. Foley
中科院分区：
文献类型：
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作者：
M. Shiflett;H. C. Foley
研究了超声沉积法制备纳米多孔碳膜的新工艺。与我们已经发表的其他工作不同，在这些工作中，通过在多孔不锈钢载体上刷或喷涂聚合物前驱体来制备膜，而超声波沉积方法提供了对沉积步骤的更大程度的控制。在纯氮气(氮气)和氧气(O2)中对UD-SNPCM进行渗透实验，以作为合成变量的函数对性能和特征进行基准测试。根据合成条件的不同，UD-SNPCM对O2/N2表现出理想的分离因子，范围从2到30。在295K时，对于其他气体，理想分离因子高达：H2/CH4=600，CO2/CH4=45，N2O/N2=17，H2/CO2=14。渗透速率在7.9×10−13~4.1×10−8molm−2PA−1s−1之间变化，且基本不受压力的影响。氧对氮的选择性与氧通量成反比。
New preparation techniques for synthesis of thin film supported nanoporous carbon membranes (SNPCM) using ultrasonic deposition (UD) have been examined. In contrast to other work we have published, in which membranes were prepared either by brush or spray coating of the polymer precursor onto the porous stainless steel support, the ultrasonic deposition method provides a greater degree of control over the deposition step. Permeation experiments on the UD-SNPCM with pure gases such as nitrogen (N2) and oxygen (O2) were used to benchmark properties and characteristics as a function of synthesis variables. The UD-SNPCM display ideal separation factors for O2/N2ranging from 2 to 30 depending on synthesis conditions. With other gases ideal separation factors were as large as: H2/CH4=600, CO2/CH4=45, N2O/N2=17, and H2/CO2=14 at 295K. Permeation rates ranged from 7.9×10−13to 4.1×10−8molm−2Pa−1s−1and were largely independent of pressure. Oxygen versus nitrogen selectivities were inversely proportional to oxygen flux.