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Heterogeneous Catalysis01:22

Heterogeneous Catalysis

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Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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High-Performance Ru1 /CeO2 Single-Atom Catalyst for CO Oxidation: A Computational Exploration.

Fengyu Li1, Lei Li2, Xinying Liu3

  • 1Department of Chemistry, Institute for Functional Nanomaterials, University of Puerto Rico, Rio Piedras Campus, San Juan, PR, 00931, USA.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
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Summary
This summary is machine-generated.

Single ruthenium atoms on cerium oxide (CeO2) show high stability and catalytic activity for carbon monoxide (CO) oxidation, making them promising single-atom catalysts.

Keywords:
CO oxidationLangmuir-Hinshelwood mechanismdensity functional calculationsheterogeneous catalysissingle-atom catalysts

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Area of Science:

  • Materials Science
  • Catalysis
  • Surface Chemistry

Background:

  • Single-atom catalysts (SACs) offer high atom utilization efficiency.
  • Ceria (CeO2) is a widely used support material in catalysis.
  • Understanding metal-support interactions is crucial for catalyst design.

Purpose of the Study:

  • To investigate the stability and CO oxidation activity of single ruthenium (Ru) atoms on different oxide supports.
  • To compare the performance of Ru on CeO2, TiO2, and Al2O3 surfaces.
  • To identify promising single-atom catalyst systems for CO oxidation.

Main Methods:

  • Density functional theory (DFT) computations were employed.
  • Calculations focused on binding energies and diffusion barriers of single Ru atoms.
  • Langmuir-Hinshelwood mechanism was used to assess CO oxidation activity.

Main Results:

  • The Ru1/CeO2 system demonstrated high stability with strong binding energies and high diffusion barriers for Ru atoms.
  • Ru atoms exhibited high mobility on TiO2 (110) and Al2O3 (001) surfaces, leading to cluster formation.
  • Ru1/CeO2 showed good catalytic activity for CO oxidation via the Langmuir-Hinshelwood mechanism.

Conclusions:

  • Single ruthenium atoms on CeO2 are highly stable and exhibit promising catalytic activity for CO oxidation.
  • The mobility of Ru on TiO2 and Al2O3 limits their efficiency as single-atom catalysts.
  • Ru1/CeO2 represents a promising single-atom catalyst for CO oxidation applications.