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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

Catalysis

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...
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...

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Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
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Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

Published on: December 6, 2021

Atomically dispersed supported metal catalysts.

Maria Flytzani-Stephanopoulos1, Bruce C Gates

  • 1Department of Chemical and Biological Engineering, Tufts University, Medford, MA 02155, USA. maria.flytzani-stephanopoulos@tufts.edu

Annual Review of Chemical and Biomolecular Engineering
|May 8, 2012
PubMed
Summary
This summary is machine-generated.

Atomically dispersed noble metals on solid supports act as active catalytic sites. Strong metal-support interactions explain their stability and activity in oxidation and reduction reactions, paving the way for efficient catalysis.

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Area of Science:

  • Materials Science
  • Catalysis
  • Surface Chemistry

Background:

  • Atomically dispersed noble metals are emerging as highly efficient catalysts.
  • Understanding metal-support interactions is crucial for catalyst stability and performance.
  • Zeolites and metal oxides offer distinct advantages as support materials.

Purpose of the Study:

  • To review recent findings on atomically dispersed noble metals as catalytic sites.
  • To explore the role of metal-support interactions in catalyst stability.
  • To discuss the application potential of these catalysts in various reactions.

Main Methods:

  • Literature review of recent research on atomically dispersed noble metal catalysts.
  • Analysis of catalytic activity and stability data for different metal-support systems.
  • Examination of synthesis methods and stabilizing/promoting strategies.

Main Results:

  • Atomically dispersed noble metals, such as platinum and gold, can act as stable and active catalytic sites.
  • Strong metal-support interactions, particularly M-O bonds, are key to the survival of single atoms under reaction conditions.
  • Both zeolites and metal oxides (e.g., ceria, perovskites) can effectively support these single-atom catalysts.
  • Catalytic activity demonstrated for oxidation and reduction reactions.

Conclusions:

  • Atomically dispersed noble metals represent a promising frontier in catalysis.
  • Further development of synthesis methods and stabilizers will enhance their practical application.
  • These catalysts offer potential for efficient resource utilization and cost savings in industrial processes.