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Aysu Yurdusen1, Pratibha Malik1, Asma Mansouri1

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We developed new metal-organic frameworks (MOFs) for CO2 capture. Modifying metal coordination geometry in these MOFs significantly improves their performance in humid conditions, crucial for real-world applications.

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Area of Science:

  • Materials Science
  • Chemistry
  • Chemical Engineering

Background:

  • Metal-organic frameworks (MOFs) are promising for carbon capture.
  • Designing MOFs with tunable properties is essential for efficient CO2 sorption.
  • Hydrophilicity of MOFs can negatively impact CO2 uptake in humid environments.

Purpose of the Study:

  • To synthesize and characterize novel heterometallic ultramicroporous MOFs.
  • To investigate the effect of metal coordination geometry on MOF properties and CO2 capture performance.
  • To design MOFs with reduced water affinity for efficient CO2 capture under humid conditions.

Main Methods:

  • Synthesis of heterometallic MOFs (MIP-212(Al/Cu) and MIP-212(Al/Zn)) using a hard-soft acid-base design strategy.
  • Structural characterization of the pyrazolate-carboxylate architectures.
  • Gas sorption measurements (CO2, N2) under various conditions (pressure, humidity).
  • Ideal Adsorbed Solution Theory (IAST) calculations for selectivity.

Main Results:

  • Two robust MOFs, MIP-212(Al/Cu) and MIP-212(Al/Zn), with dual tunnel-like pores were synthesized.
  • MIP-212(Al/Cu) showed high CO2 uptake and selectivity but was sensitive to humidity due to open metal sites.
  • MIP-212(Al/Zn), with suppressed open metal sites, exhibited lower water affinity and superior CO2 breakthrough performance under humidity.

Conclusions:

  • Metal coordination geometry in MOFs is a key factor in modulating hydrophilicity and sorption behavior.
  • The Zn-based MOF (MIP-212(Al/Zn)) demonstrates potential for efficient CO2 capture in realistic, moist environments.
  • This work enables the rational design of advanced MOFs for targeted gas separation applications.