渗透
选择性
膜
分子筛
微型多孔材料
化学工程
气体分离
材料科学
丙烷
聚合物
碳纤维
化学
高分子化学
分析化学(期刊)
色谱法
有机化学
吸附
复合材料
催化作用
复合数
工程类
生物化学
作者
Xiaoli Ma,Jerry Y S Lin,Xiaotong Wei,Jay Kniep
出处
期刊:Aiche Journal
[Wiley]
日期:2015-08-31
卷期号:62 (2): 491-499
被引量:89
摘要
Ultrathin (down to 300 nm), high quality carbon molecular sieve (CMS) membranes were synthesized on mesoporous γ‐alumina support by pyrolysis of defect free polymer films. The effect of membrane thickness on the micropore structure and gas transport properties of CMS membranes was studied with the feed of He/N 2 and C 3 H 6 /C 3 H 8 mixtures. Gas permeance increases with constant selectivity as the membrane thickness decreases to 520 nm. The 520‐nm CMS membrane exhibits C 3 H 6 /C 3 H 8 mixture selectivity of ∼31 and C 3 H 6 permeance of ∼1.0 × 10 −8 mol m −2 s −1 Pa −1 . Both C 3 H 8 permeance and He/N 2 selectivity increase, but the permeance of He, N 2 , and C 3 H 6 and the selectivity of C 3 H 6 /C 3 H 8 decrease with further decrease in membrane thickness from 520 to 300 nm. These results can be explained by the thickness‐dependent chain mobility of the polymer film which yields thinner final CMS membranes with reduction in pore size and possible closure of C 3 H 6 ‐accessible micropores. © 2015 American Institute of Chemical Engineers AIChE J , 62: 491–499, 2016
科研通智能强力驱动
Strongly Powered by AbleSci AI