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Related Concept Videos

Adsorption of Gases on Solids01:28

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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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 Isotherms II01:25

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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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High Coverage Carbon Monoxide Adsorption on a ZnAl2O4 Surface: A DFT Study.

Chunyan Sun1, Lihong Cheng2, Runping Ye1

  • 1School of Chemistry and Chemical Engineering, Nanchang University, No. 999 Xuefu Road, Nanchang 330031, PR China.

Inorganic Chemistry
|April 7, 2025
PubMed
Summary

Controlling surface oxygen vacancies in zinc aluminum oxide (ZnAl2O4) spinel is key to preventing carbon deposition. This study uses DFT to determine optimal CO pressures for different vacancy concentrations, enhancing catalyst durability.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Computational Chemistry

Background:

  • Zinc aluminum oxide (ZnAl2O4) spinel is a thermally stable catalyst support.
  • Understanding carbon monoxide (CO) interaction with ZnAl2O4 is crucial for reaction mechanisms.
  • Surface oxygen vacancies (Ovac) can influence CO adsorption and reactivity.

Purpose of the Study:

  • To investigate CO adsorption on perfect and O-defective ZnAl2O4 surfaces using DFT.
  • To determine the effect of Ovac concentration and CO coverage on carbon deposition (CD).
  • To establish conditions to suppress CD and enhance catalyst performance.

Main Methods:

  • Density Functional Theory (DFT) calculations.
  • Ab initio atomistic thermodynamics.
  • Simulation of CO adsorption at varying coverages and Ovac concentrations.
  • DFT-simulated Infrared (IR) spectroscopy.

Main Results:

  • Ovac concentration and CO coverage influence C* species formation and aggregation.
  • Carbon deposition (CD) occurs at high CO coverages on ZnAl2O4 surfaces.
  • Specific CO partial pressures at 523 K are identified to prevent CD for different Ovac concentrations (e.g., <100 atm for 0% Ovac, <10^-6 atm for 37.5% Ovac).
  • Varying Ovac concentrations significantly alter CO adsorption peaks and cause red shifts in vibrational frequencies.

Conclusions:

  • Surface Ovac concentration is a critical parameter for controlling CO adsorption and preventing CD.
  • Tailoring Ovac concentrations in ZnAl2O4 can mitigate CD and improve catalyst durability.
  • Findings provide a pathway for designing efficient and robust ZnAl2O4-based catalysts.