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Related Concept Videos

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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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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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In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
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Highly efficient Pd-based core-shell nanowire catalysts for O2 dissociation.

Yanxing Zhang1, Zongxian Yang, Meng Wu

  • 1College of Physics and Electronic Engineering, Henan Normal University, Xinxiang, Henan 453007, People's Republic of China. yzx@henannu.edu.cn.

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This study explores core-shell nanowires for oxygen dissociation. Specific transition metals as cores enhance palladium

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Computational Chemistry

Background:

  • Palladium (Pd) is a crucial catalyst for oxygen (O2) dissociation.
  • Developing cost-effective and efficient Pd-based nanocatalysts is essential for various chemical processes.
  • Core-shell nanostructures offer tunable properties for catalytic applications.

Purpose of the Study:

  • To investigate the adsorption and dissociation of O2 on M@Pd core-shell nanowires.
  • To identify optimal core materials (M) for enhanced O2 dissociation efficiency and stability.
  • To guide the design of advanced palladium-based nanocatalysts.

Main Methods:

  • First-principles density functional theory (DFT) calculations were employed.
  • Stability of core-shell nanowires (NWs) was assessed.
  • O2 dissociation pathways and activation barriers were computed.

Main Results:

  • Fe, Co, Ni, Cu, Ru, and Ir were identified as cost-effective core materials favoring the core position.
  • M@Pd core-shell nanowires exhibit high activity for O2 dissociation.
  • Activation barriers for O2 dissociation were found to be below 0.25 eV.

Conclusions:

  • Core-shell M@Pd nanowires offer a promising strategy for efficient O2 dissociation.
  • Specific transition metals can effectively replace bulk palladium, reducing cost.
  • These findings provide a foundation for designing next-generation nanocatalysts.