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Adsorption of Gases on Solids01:28

Adsorption of Gases on Solids

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Adsorption is a process where molecules, known as the adsorbates, accumulate on a surface, which is referred to as the adsorbent or substrate. Occurring at the solid-gas interface, this phenomenon is crucial in various scientific and industrial contexts. The reverse of adsorption is desorption.Two types of adsorptions exist: physical (physisorption) and chemical (chemisorption). Physisorption involves gas molecules held to the solid's surface by relatively weak intermolecular van der Waals...
29

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Monolith-Supported Amine-Functionalized Mg2(dobpdc) Adsorbents for CO2 Capture.

Lalit A Darunte1, Yuri Terada1, Christopher R Murdock1

  • 1School of Chemical & Biomolecular Engineering, Georgia Institute of Technology , 311 Ferst Drive, Atlanta, Georgia 30332, United States.

ACS Applied Materials & Interfaces
|April 26, 2017
PubMed
Summary

This study explores amine-functionalized metal-organic frameworks (MOFs) for CO2 capture. The MOF, mmen-Mg2(dobpdc), demonstrated stable performance on a structured monolith for flue gas treatment.

Keywords:
CO2 adsorptionMOF synthesis scale upMg2(dobpdc)dimethyl ethylene diamine (mmen)honeycomb cordierite monolithoriented crystal growth

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Metal-organic frameworks (MOFs) show promise for carbon dioxide (CO2) capture.
  • Developing stable and scalable MOF-based adsorbents is crucial for industrial applications.
  • Structured contactors offer advantages over traditional packed or fluidized beds for gas separations.

Purpose of the Study:

  • To investigate the potential of amine-functionalized MOFs, specifically mmen-M2(dobpdc), for CO2 capture from simulated flue gas.
  • To evaluate the stability and performance of MOFs supported on structured monoliths.
  • To demonstrate a scalable approach for MOF adsorbent deployment.

Main Methods:

  • Screening of mmen-M2(dobpdc) (M = Mg, Mn) for humidity stability using nitrogen physisorption and X-ray diffraction.
  • Synthesis of mmen-Mg2(dobpdc) MOF films on α-alumina coated cordierite monoliths via MgO nanoparticle precursor and hydrothermal treatment.
  • Assessment of CO2 adsorption capacity and cyclic performance using 10% CO2 in helium and 100% CO2.

Main Results:

  • mmen-Mg2(dobpdc) exhibited superior stability under humid conditions compared to its manganese counterpart.
  • A MOF film with good crystallite density and favorable crystal orientation was successfully synthesized on the monolith.
  • The monolith-supported MOF demonstrated CO2 uptakes of 2.37 mmol/g (10% CO2) and 2.88 mmol/g (100% CO2).
  • Excellent cyclic adsorption/desorption performance was observed over multiple cycles.

Conclusions:

  • The amine-functionalized MOF, mmen-Mg2(dobpdc), is a promising candidate for CO2 capture applications.
  • Supporting MOFs on structured monoliths provides a scalable and efficient platform for gas separations.
  • This work represents a significant step towards the practical implementation of MOF adsorbents in industrial CO2 capture processes.