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High-Connected Ternary Metal-Organic Framework Platform: Synthesis, Structure, and Methane Storage Capacity.

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Researchers developed a novel metal-organic framework (MOF) for efficient methane storage. This new material overcomes the trade-off between gravimetric and volumetric capacities, offering high performance for natural gas vehicles.

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Area of Science:

  • Materials Science
  • Chemistry
  • Chemical Engineering

Background:

  • High gravimetric and volumetric methane storage in a single metal-organic framework (MOF) is critical for natural gas vehicles.
  • A trade-off typically exists between gravimetric and volumetric methane adsorption capacities in porous materials.

Purpose of the Study:

  • To design and synthesize a novel MOF platform capable of simultaneous high gravimetric and volumetric methane storage.
  • To overcome the inherent limitations in methane storage capacities of existing porous materials.

Main Methods:

  • Synthesis of a novel pyridine-carboxylic acid ligand and combination with a trimeric iron cluster and dicarboxylic acid linkers.
  • Construction of a 9-c ternary MOF platform using dual-solvent and dual-modulator solvothermal methods.
  • Activation of MOFs via multistep solvent exchange and supercritical CO2 drying, followed by high-pressure methane adsorption tests.

Main Results:

  • A series of MOFs with an ncb-type topological network and biporous hierarchy were successfully synthesized.
  • Activated materials exhibited high porosity (pore volume > 1.90 cm³ g⁻¹), surface areas (gravimetric > 4800 m² g⁻¹, volumetric > 1600 m² cm⁻³).
  • The Fe-ncb-TPDC-II MOF achieved exceptional methane storage working capacities of 0.533 g g⁻¹ (gravimetric) and 232 cm³ (STP) cm⁻³ (volumetric) at 273 K and 80 bar.

Conclusions:

  • The developed MOF platform effectively addresses the gravimetric-volumetric trade-off for methane storage.
  • The Fe-ncb-TPDC-II MOF demonstrates superior performance compared to other porous materials under similar conditions.
  • This advancement holds significant potential for the practical application of natural gas as a vehicular fuel.