Tunable acetylene sorption by flexible catenated metal-organic frameworks

Area of Science:

• Materials Science
• Chemical Engineering
• Chemistry

Background:

• Safe storage of flammable gases like acetylene is crucial for industry.
• Pure acetylene's narrow operating pressure and temperature range, along with its explosive nature at higher pressures, pose significant storage challenges.
• Flexible metal-organic frameworks (MOFs) with gated adsorption/desorption behavior offer a promising solution for controlled gas storage.

Purpose of the Study:

• To engineer zinc-based mixed-ligand catenated metal-organic frameworks for controlled acetylene storage.
• To investigate how ligand functionalization and ratio influence framework deformation and gated adsorption properties.
• To assess the performance of these MOFs for acetylene storage under practical conditions.

Main Methods:

• Synthesis of zinc-based mixed-ligand catenated metal-organic frameworks with varying ligand functional groups and ratios.
• Characterization of framework structures and adsorption/desorption properties.
• Evaluation of acetylene storage capacity and gated release behavior at 298 K and relevant pressures.

Main Results:

• Tuning ligand functionalization and ratios effectively controlled the pressure thresholds for acetylene uptake and release.
• The modified MOFs demonstrated gated adsorption/desorption behavior driven by framework deformation.
• Achieved a usable acetylene storage capacity of approximately 90 v/v (77% of total) at 298 K within a practical pressure range of 100-150 kPa.

Conclusions:

• Functionalized mixed-ligand catenated MOFs provide a viable strategy for safe and efficient acetylene storage.
• The controlled gated adsorption mechanism allows for safe handling and release of acetylene within industrial pressure limits.
• These materials show significant potential for advancing flammable gas storage technologies.