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<p>Achieving highly selective xenon/krypton separation is a longstanding challenge due to the similar physicochemical properties of these noble gases. Here, we develop the cation-tuned gating sieving mechanism in Linde Type A zeolites to achieve a high xenon/krypton IAST selectivity over 1600. Through the cation exchange by Ag<sup>+</sup> to introduce the preferential binding of xenon over krypton gas, followed by Ca²⁺ exchange to modulate cation density within the pore cavity so as to facilitate xenon uptake, the resulting Ag<sub>9</sub>Ca<sub>1.5</sub>A overcomes the kinetic limitations and achieves a dynamic xenon/krypton selectivity of 30 — the highest reported in the open literature — along with a high dynamic xenon uptake of 1.65 mmol/g. In this work, the sieving separation mechanism is exclusively established by the combined isothermal adsorption measurements, breakthrough experiments, synchrotron powder X-ray diffraction, X-ray absorption spectra, and ab initio density functional theory calculations.</p>

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Size-inverse molecular sieving xenon/krypton separation through cation-tuned gating effect within Linde Type A zeolites

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月7日

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  • Daisong Chen,
  • Tianyi Zhang,
  • Xin Yin,
  • Kai Jia,
  • Yuying Wang,
  • Boyu Zhang,
  • Zhendong Liu,
  • Liangchun Li,
  • Qinfen Gu,
  • Banglin Chen,
  • Jin Shang

摘要

Achieving highly selective xenon/krypton separation is a longstanding challenge due to the similar physicochemical properties of these noble gases. Here, we develop the cation-tuned gating sieving mechanism in Linde Type A zeolites to achieve a high xenon/krypton IAST selectivity over 1600. Through the cation exchange by Ag+ to introduce the preferential binding of xenon over krypton gas, followed by Ca²⁺ exchange to modulate cation density within the pore cavity so as to facilitate xenon uptake, the resulting Ag9Ca1.5A overcomes the kinetic limitations and achieves a dynamic xenon/krypton selectivity of 30 — the highest reported in the open literature — along with a high dynamic xenon uptake of 1.65 mmol/g. In this work, the sieving separation mechanism is exclusively established by the combined isothermal adsorption measurements, breakthrough experiments, synchrotron powder X-ray diffraction, X-ray absorption spectra, and ab initio density functional theory calculations.