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Methane storage using metal-dipyrazolate frameworks.

Xiang-Jing Kong1,2, Varvara I Nikolayenko2,3, Alan C Eaby2

  • 1State Key Laboratory of Materials Low-Carbon Recycling, Beijing University of Technology, Beijing, China.

Nature Materials
|June 18, 2026
PubMed
Summary
This summary is machine-generated.

New metal-bipyrazolate frameworks offer improved adsorbed natural gas storage. These materials exhibit high methane deliverable capacities and hydrolytic stability, addressing limitations of previous technologies.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Energy Storage

Background:

  • Adsorbed natural gas (ANG) storage offers a safer, more cost-effective alternative to conventional methods.
  • Current ANG storage is limited by low deliverable gas capacity and material instability.
  • Flexible porous materials, like metal-organic frameworks (MOFs), show promise for enhanced ANG storage.

Purpose of the Study:

  • To develop novel flexible porous materials for efficient adsorbed natural gas storage.
  • To overcome the hydrolytic instability and pelletization challenges of existing ANG sorbents.
  • To achieve high methane deliverable capacities at ambient temperatures and low pressures.

Main Methods:

  • Synthesis of a family of metal-bipyrazolate frameworks, including Zn(dpt) and Co(dpt).
  • Investigation of methane-induced reversible narrow-pore and large-pore phase transformations.
  • In situ structural characterization, high-pressure gas sorption, and computational modeling.
  • Testing of material performance in 250-ml tanks and evaluation of formulation approaches for pelletization.

Main Results:

  • Zn(dpt) and Co(dpt) frameworks exhibit reversible structural transformations upon methane adsorption.
  • Zn(dpt) demonstrates exceptional methane deliverable capacities: 173 cm³(STP)/cm³ at 5-35 bar and 225 cm³(STP)/cm³ at 5-65 bar.
  • Zn(dpt) shows excellent hydrolytic stability, unlike previous flexible sorbents like Co(bdp).
  • High deliverable capacity was maintained over multiple adsorption-desorption cycles.
  • A formulation approach provided a practical alternative to traditional pelletization.

Conclusions:

  • Metal-bipyrazolate frameworks, particularly Zn(dpt), represent a significant advancement in adsorbed natural gas storage.
  • The developed materials offer high methane deliverable capacity, enhanced stability, and practical processability.
  • These findings pave the way for more efficient and cost-effective natural gas storage solutions.