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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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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.
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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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 Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

12.3K
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...
12.3K
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

7.9K
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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Preparation of Silver-Palladium Alloyed Nanoparticles for Plasmonic Catalysis under Visible-Light Illumination
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合金ナノ粒子の触媒活動マップ

Liang Cao1, Tim Mueller2

  • 1Institute of Catalysis, Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang 310058, P. R. China.

Journal of the American Chemical Society
|March 27, 2023
PubMed
まとめ
この要約は機械生成です。

合金ナノ粒子触媒の設計は より合理的です 酸素還元反応 (ORR) のためのプラチナ・ニッケル触媒を サイズと組成を調整することで 触媒活性をマッピングする方法を開発しました

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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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Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes
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科学分野:

  • 材料科学
  • カタリシス
  • コンピュータ化学

背景:

  • 合金ナノ粒子触媒の合理的な設計には,活動に関する予測モデルが必要です.
  • 触媒性能に対する大きさ,組成,原子構造の影響を理解することは極めて重要です.

研究 の 目的:

  • 合金ナノ粒子の触媒活動マップを生成するための計算アプローチを開発する.
  • 特定の触媒反応のための最適な合金ナノ粒子構造と組成を予測する.

主な方法:

  • 合金ナノ粒子の吸着結合エネルギーを予測するために四次クラスター膨張を使用した.
  • ナノ粒子構造とターンオーバー周波数を予測するために,動的モンテカルロシミュレーションにクラスター拡張を組み込みました.
  • 酸素還元反応 (ORR) のためのPt-Ni八面ナノ粒子触媒にアプローチを適用した.

主要な成果:

  • ナノ粒子のサイズと組成に基づいて触媒活動をマッピングする方法を開発した.
  • Pt0.85Ni0.15のPt-Ni組成と5.5 nm以上のエッジの長さでORRの最適特異活性が予測されている.
  • Pt0.8Ni0.2のPt-Ni組成と3.3~3.8 nmのエッジ長でORRの最適な質量活動が予測されている.

結論:

  • 開発されたアプローチは,合金ナノ粒子触媒の合理的な設計を可能にします.
  • ORRのような反応のためのナノ粒子触媒の最適化のための貴重な洞察を提供します.