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Adsorption Isotherms I01:29

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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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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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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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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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Coverage dependent water dissociative adsorption on Fe(110) from DFT computation.

Shaoli Liu1, Xinxin Tian, Tao Wang

  • 1State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, 030001, China.

Physical Chemistry Chemical Physics : PCCP
|March 7, 2015
PubMed
Summary

Water adsorption and dissociation on iron surfaces were studied. H2O dissociation is favored, with its behavior influenced by oxygen and hydroxyl coverage, providing insights into iron catalysis.

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Area of Science:

  • Surface Science
  • Computational Chemistry
  • Materials Science

Background:

  • Understanding water-surface interactions is crucial for catalysis and materials science.
  • Iron surfaces are important catalysts in various chemical reactions involving water.

Purpose of the Study:

  • To investigate the adsorption and dissociation of water (H2O) on the Fe(110) surface.
  • To explore the influence of surface coverage (oxygen and hydroxyl species) on water behavior.
  • To provide fundamental insights into water-involved reactions catalyzed by iron.

Main Methods:

  • Density Functional Theory (DFT) calculations.
  • Ab initio atomistic thermodynamics.
  • Thermodynamic and kinetic analyses of adsorption and dissociation processes.

Main Results:

  • Monomeric H2O dissociation is thermodynamically and kinetically favored on Fe(110).
  • H2O dissociation is accessible on oxygen-pre-covered surfaces up to 7 oxygen atoms; desorption occurs at higher coverage.
  • Surface oxygen and hydroxyl coverage significantly impacts H2O adsorption strength, dissociation barriers, and molecular arrangements, with H-bonding playing a key role.

Conclusions:

  • The study elucidates the complex interplay between water, oxygen, and hydroxyl species on iron surfaces.
  • Calculated desorption temperatures align well with experimental data, validating the computational approach.
  • Findings offer fundamental insights into water-metal interactions and iron-catalyzed reactions.