Knudsen diffusion through ZIF-8 membranes synthesized by secondary seeded growth

被引：29
作者：
Venna, Surendar R. [1 ]
Zhu, Minqi [1 ]
Li, Shiguang [1 ]
Carreon, Moises A. [1 ]
机构：
[1] Univ Louisville, Dept Chem Engn, Louisville, KY 40292 USA
来源：
JOURNAL OF POROUS MATERIALS | 2014年 / 21卷 / 02期
基金：
美国国家科学基金会;
关键词：
Metal organic frameworks; ZIF-8; Membranes; Gas separations; ZEOLITIC IMIDAZOLATE FRAMEWORKS; MOLECULAR-SIEVE MEMBRANE; METAL-ORGANIC FRAMEWORK; SEPARATION; CO2; FUNCTIONALIZATION; TEMPERATURE; PERMEATION; MIXTURES; CH4;
D O I：
10.1007/s10934-013-9768-1
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
Herein we demonstrate the synthesis of ZIF-8 membranes via secondary seeded growth on tubular stainless steel porous supports. The membranes were characterized and evaluated for the separation of CO2/N-2 and N-2/CH4 gas mixtures. The adsorbate polarizability correlated with the adsorption capacity on ZIF-8, and the amounts of gases adsorbed were in the order: CO2 > CH4 > N-2. The CO2/N-2 separation selectivity's for the ZIF-8 membranes were close to the Knudsen selectivity, suggesting that Knudsen diffusion through non-ZIF pores dominated the separation. On the other hand, the separation selectivity's for N-2/CH4 were slightly higher than the Knudsen selectivity, indicating that the flow contribution from the ZIF pores favored the transport of N-2 over CH4.
引用
收藏
页码：235 / 240
页数：6
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