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同时增强Pebax-1074-基于混合矩阵膜的透性和选择性,用于CO2分离

Rujing Hou¹, Junwei Xie¹, Yawei Gu¹

¹State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 210009, China.

|January 24, 2025

概括

在金属有机框架 (MOF) 上移植的分支聚乙烯胺增强了膜中的二氧化碳分离. 这种MOF@BPEI复合材料提高了二氧化碳的透性和选择性,克服了碳捕获技术的关键局限性.

科学领域:

材料科学材料科学材料科学
化学工程是化学工程的重要组成部分.
环境科学环境科学

背景情况:

膜技术为二氧化碳 (CO2) 分离提供了一个低碳足迹的解决方案.
膜应用中的一个重大挑战是气体透性和选择性之间的固有权衡.
现有的膜往往难以实现高性能的二氧化碳捕获.

研究的目的:

开发一种先进的膜材料,以有效地分离二氧化碳.
为了克服二氧化碳捕获膜中的透性-选择性权衡.
研究将改性金属有机框架 (MOF) 纳入聚合物矩阵的协同效应.

主要方法:

通过协调化学将分支聚乙烯胺 (BPEI) 移植到AIFFIVE-1-Ni (KAUST-8) MOF上.
在Pebax-1074聚合物矩阵中使用修改的MOF (KAUST-8@BPEI) 制造混合矩阵膜 (MMM).
评估制造MMM的CO2分离性能,包括CO2透性和CO2/N2选择性.

主要成果:

与仅使用MOF的MMM相比,KAUST-8@BPEI/Pebax-1074 MMM显著提高了CO2分离性能.
在5%重量负载下,KAUST-8@BPEI MMM 实现了156.5巴雷尔的二氧化碳透率和16.1的二氧化碳2/N2选择性.
这种性能提升归因于BPEI氨基基组的二氧化碳可溶性增加以及KAUST-8通道的二氧化碳扩散性改善.

结论:

在KAUST-8上对BPEI的协调接种有效地为二氧化碳分离膜创建了高性能填充物.
开发的KAUST-8@BPEI/Pebax-1074 MMM超过了许多报告的基于Pebax-1074的MMM的性能.
这一协调战略为设计基于MOF的先进膜以有效捕获碳提供了一个有希望的方法.

关键词:

碳捕获碳捕获碳捕获接种方式接种方式金属有机框架混合矩阵的膜膜.

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