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Adsorption Isotherms I01:29

Adsorption Isotherms I

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Adsorption isotherms are mathematical models that describe how molecules in a gas or liquid phase interact with surfaces. Two of the most common isotherm models are the Langmuir and Freundlich isotherms, which relate to Type I monolayer chemisorption. The Langmuir model is based on four key assumptions:• Adsorption cannot exceed monolayer coverage.• All surface sites are equivalent.• Molecules adsorb only at vacant sites.• There are no interactions between adsorbed...
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Adsorption of Gases on Solids01:28

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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...
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Adsorption Isotherms II01:25

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Brunauer, Emmett, and Teller (BET) introduced a theory in 1938 that modified Langmuir's assumptions to explain multilayer physical adsorption. This theory is applicable to Type II isotherms and provides a more realistic picture of adsorption processes. The BET theory assumes a uniform solid surface with localized adsorption sites, where adsorption at one site doesn't affect adsorption at neighboring sites. This theory also allows for the possibility of additional molecules being adsorbed on top...
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In certain chromatographic separations, solutes transfer between the mobile phase and the stationary phase via sorption, which typically refers to the process of adsorption. For many chromatographic systems, the sorption process often depends on the polarity of the compounds—an expression of the overall dipole moment within the molecule. During the separation process, there is competition between the solute and solvent for adsorption to the stationary phase. Highly polar compounds and...
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Adsorption Device Based on a Langatate Crystal Microbalance for High Temperature High Pressure Gas Adsorption in Zeolite H-ZSM-5
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A High-Capacity Molecular Sieve With Ultrafast Adsorption Kinetics for Separating C3F6/C3F8.

Yilu Wu1,2, Mu-Yang Zhou1, Kui Tan3

  • 1Hoffmann Institute of Advanced Materials, Shenzhen Polytechnic University, Shenzhen, P. R. China.

Angewandte Chemie (International Ed. in English)
|April 16, 2026
PubMed
Summary
This summary is machine-generated.

A novel metal-organic framework, NCU-542, efficiently separates perfluoropropene (C3F6) from perfluoropropane (C3F8) using size-sieving. This breakthrough enables high-purity electronic gas production with industrial potential.

Keywords:
adsorption kineticsfluorocarbon separationmetal–organic frameworksmolecular sieving

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Separation Science

Background:

  • Efficient separation of fluorocarbon mixtures like perfluoropropene (C3F6) and perfluoropropane (C3F8) is crucial for high-purity electronic gases.
  • The similar physicochemical properties of C3F6 and C3F8 present a significant challenge for conventional separation methods.

Purpose of the Study:

  • To develop a novel material for effective size-sieving separation of C3F6 and C3F8.
  • To investigate the pore structure and adsorption mechanisms of the material for gas separation.

Main Methods:

  • Synthesis and characterization of a zinc-based metal-organic framework, NCU-542, with a unique pore architecture.
  • Gas adsorption experiments to evaluate separation performance and kinetics.
  • In situ IR spectroscopy and Density Functional Theory (DFT) calculations to elucidate adsorption mechanisms.

Main Results:

  • NCU-542 demonstrated selective size-sieving separation of C3F6 from C3F8, excluding the bulkier C3F8 via narrow pore necks (~5.2 Å).
  • The material achieved a high C3F6/C3F8 uptake ratio (65.6) and capacity (52.5 cm³ g⁻¹), with ultrafast adsorption kinetics.
  • Cooperative C-H···F interactions at the imidazolate-zinc junctions were identified as the driving force for C3F6 recognition.

Conclusions:

  • NCU-542's specific pore geometry and optimal dimensions enable efficient size-sieving separation, overcoming the trade-off between selectivity and diffusion.
  • The material exhibits excellent structural integrity and separation performance in shaped pellet form, indicating strong industrial potential for C3F6 and C3F8 purification.