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Related Concept Videos

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...
Catalytically Perfect Enzymes01:07

Catalytically Perfect Enzymes

The theory of catalytically perfect enzymes was first proposed by W.J. Albery and J. R. Knowles in 1976. These enzymes catalyze biochemical reactions at high-speed. Their catalytic efficiency values range from 108-109 M-1s-1. These enzymes are also called 'diffusion-controlled' as the only rate-limiting step in the catalysis is that of the substrate diffusion into the active site. Examples include triose phosphate isomerase, fumarase, and superoxide dismutase.
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...

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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Engineering single-atom catalysts toward biomedical applications.

Baisong Chang1, Liqin Zhang1, Shaolong Wu1

  • 1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, P. R. China. chang@whut.edu.cn.

Chemical Society Reviews
|April 14, 2022
PubMed
Summary
This summary is machine-generated.

Single-atom catalysts (SACs) offer precise control and high efficiency, mimicking enzymes for biomedical uses. However, contrary to the "smaller is better" idea, SACs are not always the most active, especially for multi-site reactions.

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Area of Science:

  • Nanocatalysis
  • Biomedical applications
  • Materials science

Background:

  • Conventional nanocatalysts have structural defects limiting activity and selectivity.
  • Reducing nanocatalyst size enhances catalytic properties, leading to atomic-level control.
  • Single-atom catalysts (SACs) feature atomically dispersed active sites with high atom utilization and unique properties.

Purpose of the Study:

  • To review synthesis strategies and advancements in SACs for enzyme-like catalysis.
  • To compare catalytic performance across different catalyst sizes (nanoparticles to single atoms).
  • To highlight the potential and challenges of SACs in nanomedicine.

Main Methods:

  • Review of recent synthesis strategies for SACs.
  • Comparative analysis of catalyst structures and functions at various scales.
  • Discussion of SACs' roles in biomedical applications.

Main Results:

  • SACs exhibit excellent atomic utilization and precisely controlled active sites.
  • Contrary to the "smaller is better" principle, SACs are not universally superior, especially in reactions needing multi-site cooperation.
  • SACs show unique advantages for specific biomedical applications.

Conclusions:

  • Atomic-level control in catalysis is advancing, with SACs offering unique benefits.
  • The efficacy of SACs depends on the specific reaction, challenging the "smaller is better" paradigm.
  • SACs hold significant promise for nanomedicine, but further research is needed to address challenges and explore prospects.