Separation of Xe from Kr with Record Selectivity and Productivity in Anion-Pillared Ultramicroporous Materials by Inverse Size-Sieving.,Angewandte Chemie International Edition

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Separation of Xe from Kr with Record Selectivity and Productivity in Anion-Pillared Ultramicroporous Materials by Inverse Size-Sieving.
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2020-01-09 , DOI: 10.1002/anie.201913245
Qingju Wang ₁ , Tian Ke ₁ , Lifeng Yang ₁ , Zhaoqiang Zhang ₁ , Xili Cui ₁ , Zongbi Bao ₁ , Qilong Ren ₁ , Qiwei Yang ₁ , Huabin Xing ₁

Affiliation

The separation of xenon/krypton (Xe/Kr) mixture is of great importance to industry, but the available porous materials allow the adsorption of both, Xe and Kr only with limited selectivity. Herein we report an anion-pillared ultramicroporous material NbOFFIVE-2-Cu-i (ZU-62) with finely tuned pore aperture size and structure flexibility, which for the first time enables an inverse size-sieving effect in separation along with record Xe/Kr selectivity and ultrahigh Xe capacity. Evidenced by single-crystal X-ray diffraction, the rotation of anions and pyridine rings upon contact of larger-size Xe atoms adapts cavities to the shape/size of Xe and allows strong host-Xe interaction, while the smaller-size Kr is excluded. Breakthrough experiments confirmed that ZU-62 has a real practical potential for producing high-purity Kr and Xe from air-separation byproducts, showing record Kr productivity (206 mL g-1 ) and Xe productivity (42 mL g-1 , in desorption) as well as good recyclability.

中文翻译：

通过反向粒度筛分，在记录有阴离子的超微孔材料中，Xe与Kr分离，具有记录的选择性和生产率。

氙/ k（Xe / Kr）混合物的分离对工业至关重要，但是可用的多孔材料仅允许有限的选择性吸附Xe和Kr。本文中，我们报道了一种阴离子微柱化超微孔材料NbOFFIVE-2-Cu-i（ZU-62），其孔径大小和结构柔韧性均经过微调，这首次实现了分离时的反向筛分效果以及记录Xe / Kr选择性和超高Xe容量。通过单晶X射线衍射证明，较大尺寸的Xe原子接触时阴离子和吡啶环的旋转使空穴适应Xe的形状/尺寸并允许强的主体Xe相互作用，而较小尺寸的Kr被排除在外。

更新日期：2020-01-10

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