湿度对 Pebax-MOF 混合基质膜 CO2/N2 分离性能的影响,Industrial & Engineering Chemistry Research

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湿度对 Pebax-MOF 混合基质膜 CO2/N2 分离性能的影响
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2023-08-25 , DOI: 10.1021/acs.iecr.3c02308
Zikang Qin ₁ , Xuan Feng ₂ , Dengguo Yin ₃ , Bingru Xin ₂ , Ziheng Jin _{4,

5,

6} , Yi Deng _{3,

7} , Lin Yang _{4,

5,

6} , Lu Yao _{4,

5,

6} , Wenju Jiang _{4,

5,

6} , Chong Liu ₂ , Zhongde Dai _{4,

5,

6}

Affiliation

_{燃烧后捕集一直是CO 2}捕集的重要领域，但其高H ₂ O含量一直是混合基质膜（MMM）性能的重大障碍。在本研究中，建立了一系列湿度值，并在Pebax 2533（聚醚嵌段酰胺）中使用两种类型的MOF（SUM-1和SUM-9）来制备MMM来探索CO 2 _/ N _2.分离性能。在35℃和2bar下，当相对湿度（RH）从0、30、60到100%变化时，Pebax-SUM-1的CO 2 渗透率分别为380.9、433.1、405.4和401.7Barrer _，和CO ₂ /N ₂选择性分别为20.5、19.0、18.1和17.0。Pebax-SUM-9的CO ₂渗透率为390.9、387.4、412.5和452.4 Barrer，CO ₂ /N ₂选择性分别为18.5、19.9、20.0和19.7。CO ₂ /N ₂选择性没有显着波动。有人提出假设，大孔MOF只能提供传输通道而不能屏蔽CO ₂，并且CO ₂ /N ₂选择性主要由聚合物基体提供。在高湿度条件下，大孔MOFs的CO _{2传输通道可能会因H}_{2之间的竞争而失效}氧气和CO ₂。本研究调查了一系列 RH 对 MMM 分离性能的影响。_{所提出的理论表明，在潮湿条件下，MMM 的 CO 2}渗透性可能存在一个最佳湿度范围，这可用于指导未来 MMM 开发的多孔填料的设计。

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Impact of Humidity on the CO2/N2 Separation Performance of Pebax-MOF Mixed Matrix Membranes

Postcombustion capture has been an important field for CO₂ capture, but its high H₂O content has been a significant barrier to the performance of mixed matrix membranes (MMMs). In this study, a series of humidity values were established, and two types of MOFs (SUM-1 and SUM-9) were used in Pebax 2533 (poly(ether-block-amide)) to prepare MMMs to explore CO₂/N₂ separation performance. At 35 °C and 2 bar, the CO₂ permeability of Pebax-SUM-1 was 380.9, 433.1, 405.4, and 401.7 Barrer, respectively, when the relative humidity (RH) changed from 0, 30, 60, to 100%, and the CO₂/N₂ selectivity was 20.5, 19.0, 18.1, and 17.0, respectively. The CO₂ permeability of Pebax-SUM-9 was 390.9, 387.4, 412.5, and 452.4 Barrer, with the CO₂/N₂ selectivities being 18.5, 19.9, 20.0, and 19.7, respectively. The CO₂/N₂ selectivity had no significant fluctuations. A hypothesis has been proposed that the large-pore MOFs could only provide transport channels and could not screen CO₂, and the CO₂/N₂ selectivity would mainly be provided by the polymer matrix. Under high humidity conditions, the CO₂ transport channels with large-pore MOFs might fail due to competition between H₂O and CO₂. This study investigated the influence of a series of RH on MMMs separation performance. The proposed theory suggests that there might be an optimal humidity range for the CO₂ permeability of MMMs in humid conditions, which can be useful to guide the design of porous fillers for future MMMs development.

更新日期：2023-08-25

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