在坚固的基于Al的MOF中进行异原子工程,以有效地将与克里普顿分离
He Wang1,2, Zhiyan Zhang2,3, Yingying Xu2,4
1College of Chemistry and Materials Science, Hebei University, Baoding 071002, China.
Molecules (Basel, Switzerland)
|March 14, 2026
概括
分离 (Xe) 和 (Kr) 是具有挑战性的,但可以实现的. 研究人员设计了基于的金属有机框架 (Al-MOFs),具有特定的孔结构和极性,显著提高了Xe/Kr分离效率.
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.
- 分离科学 分离科学
背景情况:
- 对于工业和环境安全而言, (Xe) 和 (Kr) 的分离至关重要.
- 它们相似的物理性质 (没有永久双极体,极化能力低,动力直径相似) 给传统的多孔吸附剂带来了重大分离挑战.
研究的目的:
- 研究基金属有机框架 (Al-MOFs) 中孔几何和表面极性对Xe/Kr分离的影响.
- 探索异原子工程在提高 Xe/Kr 分离性能方面的有效性.
主要方法:
- 一系列具有不同孔隙特性的Al-MOFs (CAU-10-H,MIL-160,KMF-1,CAU-23) 的合成和表征.
- 利用理想吸附溶液理论 (IAST) 和大法典蒙特卡洛 (GCMC) 模拟来预测和分析分离性能.
- 运用第一原则密度函数理论 (DFT) 计算来理解结合机制.
- 通过动态突破性实验验验证性能.
主要成果:
- 配备极性烯链接器的MIL-160表现出卓越的Xe/Kr分离性能.
- 在298K和1.0巴的温度下,MIL-160在Xe/Kr (20/80) 混合物中获得了4.12 mmol g-1的Xe吸收率和7.63的IAST选择性.
- 动态突破实验证实XE突破时间为42.9分钟g-1.1.
- GCMC和DFT发现,合作性封闭和极化效应,特别是furanyl氧位点的Xe结合,增强了分离.
结论:
- 在Al-MOF中为Xe/Kr分离建立了明确的结构-财产关系.
- 异原子工程,特别是结合诸如烯酸氧等极性功能组,是设计高效的贵重气体吸附剂的有前途的策略.
- 这些发现凸显了定制的Al-MOF在实际Xe/Kr分离应用中的潜力.
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