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Xiu-Yuan Li1, Zhen-Jing Li1, Yong-Zhi Li1

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A triazole-based metal-organic framework (MOF) shows significantly higher ethane and ethylene adsorption than an imidazole-based MOF due to its nitrogen-rich porous channels. This highlights the impact of pore environment on gas sorption properties.

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Area of Science:

  • Materials Science
  • Chemistry
  • Chemical Engineering

Background:

  • Metal-organic frameworks (MOFs) offer tunable porous structures for gas adsorption.
  • The influence of pore environment on gas uptake in MOFs requires detailed investigation.
  • Functionalization of MOF pore walls can modulate gas-adsorbent interactions.

Purpose of the Study:

  • To comparatively analyze the effect of porous environments on gas adsorption in MOFs.
  • To synthesize and characterize imidazole- and triazole-based MOFs for gas sorption studies.
  • To understand the structure-property relationships governing gas uptake and selectivity.

Main Methods:

  • Synthesis of isostructural metal-organic frameworks (MOFs) with imidazole (1-im) and triazole (1-tz) motifs.
  • Gas adsorption measurements at 298 K and 1 atm for C2H6, C2H4, and CH4.
  • Analysis of pore environment differences using theoretical simulations.

Main Results:

  • The triazole-MOF (1-tz) exhibited significantly enhanced C2H6 (76.5 cm3 g-1) and C2H4 (73.1 cm3 g-1) uptakes compared to the imidazole-MOF (1-im).
  • The enhanced adsorption in 1-tz is attributed to open, nitrogen-decorated 1D channels, absent in 1-im.
  • 1-tz demonstrated higher adsorption selectivities for C2H6 and C2H4 over CH4.

Conclusions:

  • The porous wall environment, specifically the presence of exposed nitrogen atoms, critically influences gas adsorption capacity and selectivity in MOFs.
  • Triazole-functionalized MOFs show superior performance for adsorbing ethane and ethylene compared to their imidazole analogues.
  • This study provides insights into designing MOFs with tailored pore environments for selective gas separation.