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Adsorption of Gases on Solids

Adsorption of Gases on Solids

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...

Adsorption Isotherms II

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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...

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 molecules.Consider the...

Gas Chromatography: Introduction

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Updated: Jul 4, 2026

Preparation and Characterization of C60/Graphene Hybrid Nanostructures

Preparation and Characterization of C₆₀/Graphene Hybrid Nanostructures

Published on: May 15, 2018

Gas adsorption on a C60 monolayer.

R A Trasca¹, M W Cole, T Coffey

¹Institut for Theoretical Chemistry, Technical University Berlin, D-10623 Berlin, Germany.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|June 4, 2008

Summary

This study explores gas adsorption on C60 monolayers, finding specific attractive sites that dictate adsorption phases. Results for krypton adsorption match experimental data, validating the model.

Area of Science:

Surface Science and Nanotechnology
Computational Materials Science
Physical Chemistry

Background:

Understanding gas adsorption on fullerene-based materials is crucial for applications in gas storage and separation.
The C60 fullerene molecule presents unique surface properties due to its spherical structure and electronic characteristics.
Previous studies have explored physisorption on surfaces, but detailed geometric and energetic analyses on C60 monolayers are needed.

Purpose of the Study:

To investigate the adsorption geometry of various gases on a C60 monolayer.
To model the potential energy landscape governing adsorbate-C60 interactions.
To predict and validate adsorption phases and their onset pressures.

Main Methods:

Calculation of potential energy using integrated Lennard-Jones interactions over the C60 spherical surface.

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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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Preparation and Characterization of C60/Graphene Hybrid Nanostructures

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Published on: August 25, 2016

Identification of adsorption sites based on molecular symmetries and energy minimization.

Computation of phase onset pressures and comparison with experimental data for Krypton (Kr).

Main Results:

Identified strongly attractive adsorption sites on the C60 monolayer, leading to commensurate adsorption phases.
Determined subsequent adsorption site preferences based on the triangular C60 array symmetries.
Calculated onset pressures for different phases, showing good agreement with experimental data for Kr/C60.

Conclusions:

The Lennard-Jones interaction model accurately predicts gas adsorption behavior on C60 monolayers.
Energy minimization effectively resolves competition between different adsorption phases.
The findings provide a theoretical framework for understanding and predicting gas-surface interactions on fullerene systems.