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関連する概念動画

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

3.4K
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...
3.4K
Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

12.5K
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...
12.5K
Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation01:28

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

4.8K
Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
4.8K
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

8.1K
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.
8.1K
Catalysis02:50

Catalysis

27.5K
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.
27.5K
Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration02:34

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

8.6K
The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
8.6K

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Updated: Sep 10, 2025

Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes
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セレクティブ・セミヒドロゲネーションのためのアモルフの単層CuPd触媒

Haosen Yang1,2, Bozhou Yan3, Yufeng Xue3

  • 1State Key Laboratory of Bioinspired Interfacial Materials Science, Bioinspired Science Innovation Center, Hangzhou International Innovation Institute, Beihang University, Hangzhou, China.

Science advances
|August 20, 2025
PubMed
まとめ

アモルフなナノマテリアルは 独特の構造により 優れた触媒性能を提供します この研究では,高選択性および改良された触媒用途のための変換を達成する無形銅パラジウム (CuPd) 触媒を開発した.

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Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether
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Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether

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Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation
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Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation

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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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Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation
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Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation

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科学分野:

  • 材料科学
  • カタリシス
  • ナノテクノロジー

背景:

  • アモルフなナノマテリアルは 乱れた原子配列や 露出した活性部位のような ユニークな構造特性を表しています
  • これらの特性により,同質的および異質的触媒を橋渡しする優れた触媒性能が得られます.
  • 結晶的触媒は,しばしば活動性と選択性の制限に直面します.

研究 の 目的:

  • 設計された水素輸送経路を持つ無形な銅パラジウム (CuPd) 触媒を製造する.
  • 乱れた原子/電子構成が触媒性能に与える影響を調査する.
  • 高性能アモルフな触媒の汎用的な設計枠組みを確立する.

主な方法:

  • 銅 (Cu) イオンを無秩序なパラジウム (Pd) 格子に組み込む.
  • アモルフな単層建築の作成
  • 原子/電子構成と水素輸送経路の特徴づけ

主要な成果:

  • アモルフなCuPd触媒は,軽度な条件下で96.2%の選択性を99.1%変換で達成した.
  • 高触媒活性が6004時間−1時間の飛行時間で実証された.
  • 基板と触媒表面の間の最適化された吸着構成と結合強度が観察されました.

結論:

  • アモルフなアーキテクチャは,高度な触媒の汎用的な設計フレームワークを提供します.
  • 乱れた原子配列,均等に分布した活性部位,調節可能な吸着エネルギーは高性能の鍵です.
  • アモルフな触媒は,従来の結晶系と比較して優れた選択性と活性性を提供します.