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Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

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

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

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.
Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation01:28

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

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...
Benzene to Phenol via Cumene: Hock Process01:27

Benzene to Phenol via Cumene: Hock Process

The synthesis of phenol from benzene via cumene and cumene hydroperoxide is called the Hock process. First, a Friedel–Crafts alkylation reaction of benzene with propene gives cumene. Then cumene forms cumene hydroperoxide via a radical chain reaction. In the chain initiation step, the benzylic hydrogen is abstracted to give a benzylic radical. In the chain propagation step, the benzylic radical reacts with an oxygen diradical to form a cumene hydroperoxide radical. The cumene hydroperoxide...
Phase I Reactions: Oxidation of Carbon-Heteroatom and Miscellaneous Systems01:15

Phase I Reactions: Oxidation of Carbon-Heteroatom and Miscellaneous Systems

Oxidative reactions are pivotal in metabolizing numerous compounds, including pharmaceutical drugs. These reactions often occur in carbon-heteroatom systems, such as carbon-nitrogen, carbon-sulfur, and carbon-oxygen.
In carbon-nitrogen systems, aliphatic and aromatic amines can undergo oxidative reactions. Secondary and tertiary amines, like those found in tricyclic antidepressants, can undergo N-dealkylation, a process that involves the oxidation of the alkyl group. In addition, oxidative...

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1T'-Phase Janus MoSSe モノレイヤの溶液処理可能な微細構造化により,水素の生産が促進される

Zhengqing Liu1, Zhehao Sun2, Xiaoyan Qu3

  • 1Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE), Xi'an Institute of Biomedical Materials and Engineering, Northwestern Polytechnical University, Xi'an 710129, China.

Journal of the American Chemical Society
|August 9, 2024
PubMed
まとめ

研究者は,ジャヌス1T'-モリブデン・ディセレニド (MoSe2) モノレイヤのスケーラブルな方法を開発した. この新しい触媒は,クリーンエネルギーアプリケーションのための光誘発効果によって強化された水素進化反応 (HER) の活性を示しています.

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科学分野:

  • 材料科学
  • ナノテクノロジー
  • カタリシス

背景:

  • 移行金属二カルコゲン化物 (TMD) のジャヌス単層は,多様な用途のために調節可能な性質を持っています.
  • 非従来の1T"段階のジャヌスTMDのスケーラブルな合成は大きな課題です.
  • 以前の研究は主に従来の2H相ジャヌスTMDに焦点を当てていた.

研究 の 目的:

  • ジャヌス1T"相モリブデン・ディセレニド (MoSSe) および関連する材料のためのスケーラブルな合成戦略を開発する.
  • これらの新しいジャヌスTMDの電気触媒的水素進化反応 (HER) の活動を調査する.
  • 本質的なストレンス,電子構造,およびプラズモニック増強が触媒性能に与える相乗効果を探求する.

主な方法:

  • 金 (Au) ナノコアにSe-Mo-O/S殻を成長させる溶液戦略によるJanus 1T"-MoOSeおよびMoSSe単層の製造.
  • 水素進化反応 (HER) のジャヌス Au@1T"-MoSSe触媒の電気触媒試験
  • 局所的な表面プラズモン (LSP) の効果を,HER活性を増強するためにAuナノコアを光刺激することによって調査する.

主要な成果:

  • Janus Au@1T"-MoSSe触媒は,1T"-MoS2, -MoSe2,および -MoOSeと比較して優れているHER活性を示した.
  • 強化された触媒活動は,ジャヌス1T"-MoSSeのユニークな電子構造と固有のストレスのせいである.
  • Auコアの光刺激は,局所された表面プラズモン (LSP) によって誘発された硫黄の空隙に熱い電子を注入することによって HERを著しく増加させた.

結論:

  • 1T"段階における多形ジャヌスTMDのスケーラブルな合成が達成された.
  • アニオンの空白をストレスおよび光誘発のLSPでシネジスティックに活性化することは,高度な触媒の経路を提供します.
  • 調整可能なジャヌスTMDは,水素生産などのアプリケーションのための効率的な触媒の開発の機会を提供します.