Adsorption of probe molecules in pillared interlayered clays: experiment and computer simulation

Area of Science:

• Materials Science
• Nanotechnology
• Physical Chemistry

Background:

• Pillared interlayered clays (PILC) are complex microporous materials with applications in catalysis and separation.
• Characterizing the intricate porous structure of PILC is crucial for understanding their adsorption properties.
• Existing methods may not fully capture the disordered nature of PILC systems.

Purpose of the Study:

• To characterize the porous structure of zirconium-based PILC (Zr PILC).
• To investigate the adsorption behavior of various probe molecules within Zr PILC.
• To develop and validate structural models for these complex materials.

Main Methods:

• Volumetric and microcalorimetric adsorption experiments using nitrogen, toluene, and mesitylene.
• Neutron scattering experiments with toluene as adsorbate.
• Computer simulations including geometric analysis, percolation analysis, and Grand Canonical Monte Carlo simulations.

Main Results:

• Adsorption isotherms were modeled using proposed structural models.
• Microscopic interpretations of adsorption processes were achieved.
• The influence of interactions and steric effects on adsorption was elucidated.

Conclusions:

• A series of structural models were proposed to explain the adsorption behavior of Zr PILC.
• These models provide a microscopic understanding of adsorption in disordered microporous systems.
• The study offers insights into the role of molecular interactions and steric effects in PILC adsorption.