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Adsorption Isotherms II

Adsorption Isotherms II

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...

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...

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Hemoglobin (Hb) is a crucial molecule in the human body, consisting of four polypeptide chains, each bound to an iron-containing heme group. This unique structure enables hemoglobin to bind to oxygen, with each molecule capable of combining with four molecules of oxygen, leading to rapid and reversible oxygen loading. When fully loaded with oxygen, it is called oxyhemoglobin, while hemoglobin that has released oxygen is called reduced hemoglobin or deoxyhemoglobin. As hemoglobin binds oxygen,...

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Related Experiment Video

Updated: May 31, 2026

In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework

In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO₂ Adsorption in UiO-66 Metal-Organic Framework

Published on: February 1, 2020

Oxygen adsorption on Pt/Ru(0001) layers.

Peter Jakob¹, Andreas Schlapka, Pawel Gazdzicki

¹Fachbereich Physik und Wissenschaftliches Zentrum für Materialwissenschaften, Philipps-Universität Marburg, D-35032 Marburg, Germany. peter.jakob@physik.uni-marburg.de

The Journal of Chemical Physics

|June 21, 2011

Summary

Oxygen adsorption on platinum films grown on ruthenium (Pt/Ru(0001)) shows thickness-dependent behavior. Dissociative sticking is suppressed for thin films, with molecular oxygen adsorption occurring at step edges, not terraces.

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Last Updated: May 31, 2026

In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework

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In Situ SIMS and IR Spectroscopy of Well-defined Surfaces Prepared by Soft Landing of Mass-selected Ions

In Situ SIMS and IR Spectroscopy of Well-defined Surfaces Prepared by Soft Landing of Mass-selected Ions

Published on: June 16, 2014

Area of Science:

Surface Science
Materials Science
Heterogeneous Catalysis

Background:

Epitaxially grown bimetallic layers exhibit altered chemical properties compared to pure elements.
Strain and interface electronic effects significantly modify surface reactivity.
Dissociative adsorption of diatomic molecules is a key probe for surface reactivity.

Purpose of the Study:

Investigate oxygen adsorption on epitaxially grown platinum films on a ruthenium (0001) surface.
Analyze the influence of platinum film thickness on adsorption energetics and dissociation.
Elucidate the roles of lateral strain and substrate interaction in modifying O(2) adsorption.

Main Methods:

Infrared absorption spectroscopy
Thermal desorption spectroscopy
Utilizing Pt/Ru(0001) as a model system

Main Results:

Oxygen adsorption and dissociation strongly depend on platinum film thickness.
Molecular oxygen chemisorption is suppressed on Pt monolayer films, with adsorption occurring at step edges.
Dissociative sticking approaches that of pure Pt(111) for films with three or more platinum layers (N(Pt) ≥ 3).

Conclusions:

The Pt/Ru(0001) system reveals thickness-dependent modifications in O(2) adsorption energetics.
Step edges on Pt monolayer films provide a low-barrier adsorption site for O(2).
Strain and substrate interactions significantly influence the dissociative adsorption of O(2) on bimetallic surfaces.