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Related Concept Videos

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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Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

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Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
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Thermal Sigmatropic Reactions: Overview01:16

Thermal Sigmatropic Reactions: Overview

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Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in 1,5-hexadiene, referred...
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Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

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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.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
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Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

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Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
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Surface Single-Cluster Catalyst for N2-to-NH3 Thermal Conversion.

Xue-Lu Ma1, Jin-Cheng Liu1, Hai Xiao1

  • 1Department of Chemistry and Key Laboratory of Organic Optoelectronics & Molecular Engineering of Ministry of Education, Tsinghua University , Beijing 100084, China.

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|December 16, 2017
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This study reveals a new biomimetic pathway for ammonia synthesis using a bimetallic catalyst. The findings suggest a novel single-cluster catalyst design for efficient nitrogen fixation.

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Area of Science:

  • Catalysis
  • Materials Science
  • Surface Chemistry

Background:

  • Ammonia synthesis is crucial, with biological nitrogen fixation serving as a key inspiration.
  • Developing efficient catalysts for nitrogen (N₂) to ammonia (NH₃) conversion is a significant scientific challenge.

Purpose of the Study:

  • To investigate the catalytic mechanisms of N₂-to-NH₃ thermal conversion on a specific bimetallic catalyst, Rh₁Co₃/CoO(011).
  • To propose a new platform for designing single-cluster catalysts (SCCs) for biomimetic ammonia synthesis.

Main Methods:

  • Computational investigation of catalytic mechanisms.
  • Analysis of N₂ hydrogenation pathways on a singly dispersed bimetallic catalyst.

Main Results:

  • The preferred pathway follows an associative mechanism, mimicking biological nitrogen fixation.
  • Hydrogen (H₂) activation occurs on both metal sites of the catalyst.
  • The proposed M₁Aₙ catalyst structure, with a doped metal atom M on a metal A oxide surface, shows promise.

Conclusions:

  • The M₁Aₙ catalyst platform offers a new approach for biomimetic N₂-to-NH₃ thermal conversion.
  • Catalytic activity is enhanced by the charge buffer capacity of the doped metal and the synergistic effects of the base metal.
  • The study provides insights for optimizing M₁Aₙ catalysts for ammonia production.