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Related Concept Videos

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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The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
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Engineering MXene surfaces and heterostructure interfaces for efficient heterogeneous catalysis.

Liang Tian1, Feiyan Xu1,2, German Sastre1

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MXenes offer tunable surfaces and interfaces for advanced catalysis. Engineering these materials precisely controls charge flow and reaction energetics, enabling programmable and stable catalysts for sustainable applications.

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Area of Science:

  • Materials Science
  • Catalysis
  • Surface Chemistry

Background:

  • Catalyst surfaces and interfaces are crucial for heterogeneous catalysis, but atomic-level control over charge and energetics is difficult.
  • MXenes (2D transition-metal carbides, nitrides, carbonitrides) present a tunable platform with rich surface terminations influencing properties.
  • Current challenges lie in achieving sufficient control over surface charge dynamics and reaction energetics with single materials.

Purpose of the Study:

  • To review recent advancements in MXene surface and interface engineering for catalysis.
  • To elucidate how atomic configurations in MXenes regulate charge dynamics and catalytic behavior.
  • To outline design principles for developing programmable, self-adaptive, and stable MXene catalysts.

Main Methods:

  • Surface engineering: controlled regulation of terminations, heteroatom doping, defect generation, and morphology.
  • Interface engineering: coupling MXenes with metals, semiconductors, or carbon materials to form heterostructures.
  • Analysis of atomic configurations and their impact on charge transport and catalytic pathways.

Main Results:

  • Surface engineering allows precise tuning of MXene active sites, adsorption energies, and redox potentials.
  • Interface engineering creates heterostructures with Fermi-level equilibration, built-in electric fields, and orbital hybridization.
  • Hierarchical design strategies transform MXenes into dynamic catalytic mediators bridging electro-, photo-, and thermocatalysis.

Conclusions:

  • MXene surface and interface engineering are key to designing advanced catalysts.
  • Atomic-level control over charge dynamics and reaction energetics is achievable through these strategies.
  • This approach enables the development of programmable, self-adaptive, and stable MXene catalysts for sustainable heterogeneous catalysis.