具有周期性和非周期性灵活性的三酸框架可有效分离二氧化碳
Chao Wang1, Xue-Wen Zhang1, Xiao-Xian Chen1
1MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, GBRCE for Functional Molecular Engineering, School of Chemistry, IGCME, Sun Yat-Sen University, Guangzhou 510275, China.
Journal of the American Chemical Society
|May 13, 2024
概括
本研究介绍了MAF-2Fa和MAF-2Fb两种异构铜三酸框架,它们对二氧化碳 (CO) 捕获具有明显的灵活性. MAF-2Fb显示出优异的低压CO分离,实现净化至关重要的超低泄漏率.
科学领域:
- 材料科学
- 化学学
- 化学工程
背景情况:
- 基于分子的晶体多孔材料表现出客体诱导的转变 (周期性灵活性),但它们在吸附性分离中的实用性仍有争议.
- 这些材料的无周期性灵活性较少被探索,但有可能提供独特的分离能力.
研究的目的:
- 用同位素Cu (I) 三酸框架研究周期性与非周期性灵活性在二氧化碳 (CO) 吸附和分离中的作用.
- 评估这些框架在不同压力和湿度条件下的性能.
主要方法:
- 两种同位素Cu (I) 三酸框架的合成和表征:α-[Cu (fetz) ] (MAF-2Fa) 和β-[Cu (fetz) ] (MAF-2Fb).
- 量化混合物突破性实验,以评估碳吸附能力和分离效率.
- 在高相对湿度条件下对分离性能进行评估.
主要成果:
- 在高压下,MAF-2Fa (周期性灵活性) 呈现出高CO吸附率,但在低压下则有显著的泄漏率 (<1ppb).
- 在低压下,MAF-2Fb (非周期性灵活性) 的吸附率较低,但CO泄漏率微不足道 (<1ppb).
- MAF-2Fa和MAF-2Fb的并联连接可以提高压力范围内的总体碳捕获.
- 这两个框架在高湿度下保持性能;MAF-2Fb在82%的相对湿度下显示独特的共吸收,改善了净化.
结论:
- 在MAF-2Fb中,非周期性灵活性对于实现具有极低泄漏率的高度选择性CO分离至关重要,其性能优于MAF-2Fa在低压应用中的周期性灵活性.
- 结合具有不同灵活性的框架,为有效的碳捕获提供了一种协同方法.
- MAF-2Fb显示了增强净化过程的潜力,特别是在潮湿的条件下.
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