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Related Concept Videos

Heterogeneous Catalysis01:22

Heterogeneous Catalysis

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...
Catalysis02:50

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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.
Catalysis01:27

Catalysis

Catalysis influences the rate of chemical reactions by providing an alternative reaction pathway with lower activation energy. A catalyst speeds up a reaction, but it is not consumed during the process. The fundamental principle of catalysis is the ability of a catalyst to alter the reaction mechanism, often introducing a more efficient pathway than the uncatalyzed process.In a catalyzed reaction, the catalyst participates directly in the reaction mechanism. It interacts with reactants to form...

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Core-shell nanostructured catalysts.

Qiao Zhang1, Ilkeun Lee, Ji Bong Joo

  • 1Department of Chemistry, University of California, Riverside, CA 92521, USA.

Accounts of Chemical Research
|December 28, 2012
PubMed
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Core-shell nanostructures enhance catalyst stability and performance by protecting active nanoparticles within porous shells. Researchers developed methods to control shell porosity and crystallinity, optimizing catalytic activity and enabling new applications.

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Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
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Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry

Published on: October 18, 2019

Area of Science:

  • Materials Science
  • Nanotechnology
  • Catalysis

Background:

  • Nanotechnology enables precise control over catalyst size, shape, and surface properties, leading to improved selectivity and recyclability.
  • Core-shell nanostructures offer enhanced structural stability by encapsulating active nanoparticles, preventing migration and coalescence during reactions.

Purpose of the Study:

  • To synthesize and characterize effective core-shell catalysts with porous shells for improved reactant accessibility.
  • To develop methods for controlling shell porosity and crystallinity to optimize catalytic activity.
  • To investigate the role of core-shell architecture in enhancing catalytic performance and stability.

Main Methods:

  • Developed a surface-protected etching process for mesoporous silica and titania shells with tunable porosity.
  • Applied a silica-protected calcination method to create crystalline, high-surface-area shells (e.g., anatase titania).
  • Fabricated a SiO₂/Au/N-doped TiO₂ core-shell photocatalyst with a sandwich structure.
  • Utilized in situ infrared absorption spectroscopy and titration experiments to probe reactant accessibility and catalytic properties.

Main Results:

  • Achieved controllable porosity in mesoporous silica and titania shells, allowing tuning of catalytic reaction rates.
  • Successfully prepared crystalline anatase titania shells with controlled crystallinity and porosity, optimizing photocatalytic activity.
  • Demonstrated excellent catalytic activity for organic compound oxidation using a SiO₂/Au/N-doped TiO₂ core-shell photocatalyst under various light conditions.
  • Gained insights into reactant diffusion through shells using in situ spectroscopic and solution-based experiments.

Conclusions:

  • Porous core-shell nanostructures are effective catalysts with enhanced stability and tunable properties.
  • Controlled shell porosity and crystallinity are crucial for optimizing catalytic performance, particularly in photocatalysis.
  • Core-shell architectures offer opportunities for synergistic effects, boosting catalytic activity through interfacial engineering and light harvesting.