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Updated: Jan 16, 2026

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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One-Step CO2/Xe/Kr Purification from Used Nuclear Fuel Reprocessing Off-Gas via Gas Preparative Chromatography.

Bin Chen1,2,3, Yongzheng Wang1, Tian Cao2,3

  • 1State Key Laboratory of Fluorine & Nitrogen Chemicals, School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi, China, 710049.

Small (Weinheim an Der Bergstrasse, Germany)
|September 27, 2025
PubMed
Summary

Researchers developed a new adsorbent, CALF-20, for capturing and purifying carbon dioxide (CO2), xenon (Xe), and krypton (Kr) from nuclear fuel reprocessing off-gas. This material shows high selectivity and radiation stability for environmental and industrial applications.

Keywords:
CO2/Xe/Kr purificationUNF reprocessing off‐gasadsorption separationgas preparative chromatographyradiation stability

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Area of Science:

  • Materials Science
  • Nuclear Engineering
  • Environmental Science

Background:

  • Effective capture and purification of carbon dioxide (CO2), xenon (Xe), and krypton (Kr) from used nuclear fuel (UNF) reprocessing off-gas are critical for environmental protection and industrial processes.
  • Developing adsorbents with high capacity, selectivity, and radiation resistance for these gases presents a significant challenge.

Purpose of the Study:

  • To evaluate three metal-organic frameworks (MOFs) – HUKST-1, CALF-20, and SIFISIX-3-Ni – for their ability to separate CO2, Xe, and Kr from UNF reprocessing off-gas.
  • To identify a benchmark adsorbent for efficient, one-step purification of these gases.

Main Methods:

  • Adsorption isotherms, breakthrough curves, and chromatographic profiles were used to assess gas adsorption and separation performance.
  • Gamma-ray irradiation experiments were conducted to evaluate the radiation stability of the selected MOFs.

Main Results:

  • CALF-20 exhibited exceptional performance in capturing and separating CO2, Xe, and Kr, attributed to its unique pore environment that enables differential gas recognition and polarization.
  • The adsorbent demonstrated excellent performance under dilute gas conditions.
  • CALF-20 showed high stability when exposed to gamma-ray irradiation.

Conclusions:

  • CALF-20 is established as a benchmark adsorbent for the one-step purification of CO2, Xe, and Kr from UNF reprocessing off-gas.
  • Rational control of MOF pore environments is a promising strategy for engineering tailored adsorbents for specialized gas separations.