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Adsorption Isotherms I01:29

Adsorption Isotherms I

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...

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First-principles study toward CO adsorption on Au/Ni surface alloys.

Yu Cheng Huang1, Jin Yan Du, Tao Zhou

  • 1College of Chemistry and Material Science, Anhui Normal University, Beijing, China. huangyc@mail.ahnu.edu.cn

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|October 11, 2012
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Adding gold to nickel catalysts enhances methane steam reforming. Gold weakens CO molecule binding on nickel surfaces, with binding energy decreasing as gold concentration increases, offering insights into catalyst design.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Catalysis

Background:

  • Nickel-based catalysts are crucial for methane steam reforming.
  • Introducing a second metal, like gold (Au), can enhance catalyst performance and stability.
  • Understanding the electronic and adsorption properties of bimetallic surfaces is key to catalyst optimization.

Purpose of the Study:

  • To investigate the influence of gold addition on the adsorption properties and electronic structure of Ni(111) surfaces.
  • To examine the adsorption of carbon monoxide (CO) as a probe molecule on various Au/Ni surfaces.
  • To establish structure-property relationships for Au/Ni alloy catalysts.

Main Methods:

  • Density Functional Theory (DFT) calculations were employed to model Au/Ni surfaces.
  • Carbon monoxide (CO) adsorption was simulated on different Au/Ni surface configurations.
  • Electronic structure analysis was performed to understand the interaction mechanisms.

Main Results:

  • Gold addition was found to weaken the interaction between adsorbates and the Ni(111) surface.
  • The binding energy of CO decreased with increasing gold concentration.
  • A quantitative correlation was established between gold concentration and binding energy, predictable by counting neighboring gold atoms.

Conclusions:

  • The electronic structure of surface nickel atoms is modified by gold, leading to weakened adsorbate-substrate interactions.
  • An empirical rule was developed to estimate binding energies based on the number and proximity of gold atoms to the adsorption site.
  • This finding is applicable to other adsorbates (C, H, O) and potentially to other surface alloy systems.