Microporous carbon granules with narrow pore size distribution and rich oxygen functionalities for Xe/Kr separation

Zhiwei Zhao, Ke Wu, Yong Peng, Yi Liu, Zhenning Deng, Xinxin Han, Shixia Chen, Jingwen Chen, Shuguang Deng, Jun Wang

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The direct adsorptive separations of xenon (Xe) and krypton (Kr) using granular porous carbons remain challenging yet industrially important. Herein, we report microporous carbon granules with narrow pore size distributions and rich oxygen functionalities for efficient Xe/Kr separation. The optimized granular carbon (GBC-900) breaks the trade-off effect by showing high Xe uptake capacity (4.71 mmol g−1) and Xe/Kr selectivity (18.3) at 298 K and 1.0 bar. Notably, the synergistic effect of oxygen-functionalities and uniform micropores renders the ultrahigh Xe uptake of 2.78 mmol g−1 at 0.2 bar. Furthermore, density functional theory calculations disclose the strong affinity between oxygen groups and Xe atoms. Dynamic breakthrough experiments confirm the practical Xe/Kr separation feasibility even from humid and low-concentration Xe/Kr gas-mixtures.

Original languageEnglish (US)
Article number122074
JournalSeparation and Purification Technology
Volume302
DOIs
StatePublished - Dec 1 2022
Externally publishedYes

Keywords

  • Carbon granules
  • Narrow pore size distribution
  • UNF off-gas
  • Ultramicroporous adsorbent
  • Xe/Kr separation

ASJC Scopus subject areas

  • Analytical Chemistry
  • Filtration and Separation

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