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Updated: Jan 11, 2026

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Humidity-Resistant Methane Single-Molecule Traps for Efficient Separation of Coal-Bed Methane.

Junhua Wang1, Yufei Li1, Qiong Lei2

  • 1School of Materials Science and Engineering, National Institute for Advanced Materials, State Key Laboratory of Elemento-Organic Chemistry, Frontiers Science Center for New Organic Matter, Nankai University, Tianjin, 300350, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|November 19, 2025
PubMed
Summary

A new metal-organic framework (MOF) with a "methane single-molecular trap" (MSMT) architecture efficiently captures methane from coal-bed methane (CBM). This design enhances selectivity and humidity resistance for industrial purification.

Keywords:
CH4/N2 separationmetal–organic frameworksmethane purificationmethane single‐molecule trap

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Efficient methane capture from coal-bed methane (CBM) is vital for energy and environmental goals.
  • Existing adsorbents face challenges with selectivity and moisture interference.

Purpose of the Study:

  • To develop a novel adsorbent with a "methane single-molecular trap" (MSMT) architecture for enhanced methane (CH4) capture from CBM.
  • To investigate the performance and underlying mechanisms of the MSMT-based metal-organic framework (MOF).

Main Methods:

  • Synthesis of a novel MOF, MSMT-NKMOF-1, featuring MSMT architecture.
  • Experimental evaluation of CH4/N2 separation performance, including dynamic selectivity and productivity.
  • Combined experimental and theoretical analyses to understand adsorption mechanisms and humidity resistance.

Main Results:

  • MSMT-NKMOF-1 demonstrated efficient CH4/N2 separation with a dynamic selectivity of 9.2 and CH4 productivity of 22.6 L kg-1 at 298 K and 1 bar.
  • The MSMT design improved selectivity by eliminating inaccessible adsorption sites and provided significant humidity resistance.
  • Rapid, environmentally friendly, room-temperature synthesis of MSMT-NKMOF-1 was achieved.

Conclusions:

  • MSMT-NKMOF-1 is a promising adsorbent for CH4/N2 separation in CBM purification due to its unique architecture and performance.
  • The MSMT design offers a generalizable strategy for developing advanced porous materials for gas separation and capture.
  • This work provides a feasible pathway for industrial CBM purification with improved efficiency and stability.