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Catalysis02:50

Catalysis

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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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For many years, scientists thought that enzyme-substrate binding took place in a simple "lock-and-key" fashion. This model stated that the enzyme and substrate fit together perfectly in one instantaneous step. However, current research supports a more refined view scientists call induced fit. The induced-fit model expands upon the lock-and-key model by describing a more dynamic interaction between enzyme and substrate. As the enzyme and substrate come together, their interaction causes...
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Reduction of Alkenes: Catalytic Hydrogenation02:13

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Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
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Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

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Introduction
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Task-Specific Janus Materials in Heterogeneous Catalysis.

Majid Vafaeezadeh1, Werner R Thiel1

  • 1Fachbereich Chemie, Technische Universität Kaiserslautern, Erwin-Schrödinger-Strasse 54, 67663, Kaiserslautern, Germany.

Angewandte Chemie (International Ed. in English)
|June 7, 2022
PubMed
Summary
This summary is machine-generated.

Janus nanomaterials, with distinct properties on each face, are revolutionizing heterogeneous catalysis. This review highlights their diverse applications in chemical reactions, from reduction to cross-coupling and electrocatalysis.

Keywords:
Green Catalytic ReactionsHeterogeneous CatalysisInterfacial CatalysisJanus CatalystPickering Emulsion

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Area of Science:

  • Materials Science
  • Catalysis
  • Nanotechnology

Background:

  • Janus materials are anisotropic nanostructures with two distinct faces.
  • These materials exhibit unique physicochemical properties, driving innovation in various fields.
  • Recent advancements focus on their application in catalysis and energy storage.

Purpose of the Study:

  • To systematically review recent achievements in applying Janus nanomaterials as heterogeneous catalysts.
  • To cover a wide range of chemical reactions catalyzed by these materials.
  • To provide an outlook on future applications of Janus nanomaterials in catalysis.

Main Methods:

  • Literature review of recent and significant achievements.
  • Systematic coverage of various catalytic reaction types.
  • Analysis of applications in reduction, oxidation, biomass transformation, and more.

Main Results:

  • Janus nanomaterials show significant progress as heterogeneous catalysts.
  • Applications span diverse reactions including desulfurization, dye degradation, and cross-coupling.
  • Emerging roles in electro- and photocatalytic reactions are highlighted.

Conclusions:

  • Task-specific Janus nanomaterials are highly effective heterogeneous catalysts.
  • Their unique properties enable efficient catalysis across a broad spectrum of chemical transformations.
  • Future research holds promise for expanded applications in catalysis and beyond.