当前位置: X-MOL 学术AlChE J. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Large-area vacuum-treated ZIF-8 mixed-matrix membrane for highly efficient methane/nitrogen separation
AIChE Journal ( IF 3.5 ) Pub Date : 2022-05-11 , DOI: 10.1002/aic.17749
Zhenjie Gu 1, 2, 3 , Zibo Yang 1, 2 , Yuxiu Sun 1, 4 , Zhihua Qiao 1, 4 , Chongli Zhong 1, 4
Affiliation  

Development of materials with excellent separation performances remains an ongoing challenge in methane/nitrogen (CH4/N2) separation science. Herein, a facile and effective method for enhancing CH4 uptake, binding, and CH4/N2 selectivity using the surface-carbonized and stiffened zeolitic imidazolate framework-8 (CSZ) via high-vacuum-resistance calcination (HVRC) was demonstrated. Such vacuum-treated CSZ nanoparticles, with carbonized structures that contain Zn-rich sites, high stability, and satisfactory compatibility with polymers, were then uniformly mixed with the strong basic polymer polyvinylamine (PVAm) to obtain large-area mixed-matrix membranes (1120 cm2, which is ca. 2 pieces of A4-size paper). Owing to the presence of Zn-rich sites and amino groups, CH4 molecules were bound more readily to CSZ and PVAm than N2, as confirmed by gas adsorption isotherms and DFT calculations. The obtained MMM modules (ca. 2000 cm2) exhibited outstanding CH4 separation performances at 85 wt% CSZ loading, achieving a CH4 permeance of 7600 GPU and CH4/N2 selectivity of 4.35.

中文翻译:

大面积真空处理的 ZIF-8 混合基质膜用于高效的甲烷/氮气分离

开发具有优异分离性能的材料仍然是甲烷/氮(CH 4 /N 2)分离科学中的一项持续挑战。在此,展示了一种通过高真空电阻煅烧 (HVRC) 使用表面碳化和硬化的沸石咪唑酸酯骨架 8 (CSZ) 来提高 CH 4吸收、结合和 CH 4 /N 2选择性的简便有效的方法。这种真空处理的 CSZ 纳米粒子具有碳化结构,含有富锌位点,稳定性高,与聚合物相容性好,然后与强碱性聚合物聚乙烯胺 (PVAm) 均匀混合,得到大面积混合基质膜 (1120厘米2,大约是。2 张 A4 尺寸的纸)。由于存在富锌位点和氨基,CH 4分子比 N 2更容易与 CSZ 和 PVAm 结合,气体吸附等温线和 DFT 计算证实了这一点。获得的 MMM 模块(约 2000 cm 2)在 85 wt% CSZ 负载下表现出出色的 CH 4分离性能,实现了7600 GPU的 CH 4渗透率和 4.35 的 CH 4 /N 2选择性。
更新日期:2022-05-11
down
wechat
bug