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Radical Formation: Homolysis00:54

Radical Formation: Homolysis

A bond is formed between two atoms by sharing two electrons. When this bond is broken by supplying sufficient energy, either two electrons can be taken up by one atom forming ions by the cleavage called heterolysis, or the two electrons are shared by two atoms, with one each creating radicals by the cleavage called homolysis.
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...
Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration02:34

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

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.
Hydrogen Bonds01:04

Hydrogen Bonds

A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
Hydrogen Bonds00:26

Hydrogen Bonds

Hydrogen BondsHydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.Hydrogen Bonds Control the World!Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are...
Acid-Catalyzed Hydration of Alkenes02:45

Acid-Catalyzed Hydration of Alkenes

Alkenes react with water in the presence of an acid to form an alcohol. In the absence of acid, hydration of alkenes does not occur at a significant rate, and the acid is not consumed in the reaction. Therefore, alkene hydration is an acid-catalyzed reaction.

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Hydrogen Production and Utilization in a Membrane Reactor
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Hydrogen Production and Utilization in a Membrane Reactor

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直接によるCO解離と,水素によるCO解離との比較.

Sharan Shetty1, Antonius P J Jansen, Rutger A van Santen

  • 1Institute of Complex Molecular Systems, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands. s.g.shetty@tue.nl

Journal of the American Chemical Society
|August 21, 2009
PubMed
まとめ

ルテニウム表面での一酸化炭素の直接解離はフィッシャー-トロプシュプロセスを開始します. この経路は,水素補助経路よりもエネルギーバリアが低く,液体炭化水素を合成する重要なステップを明確にしています.

科学分野:

  • カタリシス カタリシス カタリシス
  • 表面科学とは,地表科学である.
  • 化学工学は化学工学というものです.

背景:

  • フィッシャー・トロプシュ (F-T) プロセスは,合成ガスを液体炭化水素に変換するのに極めて重要です.
  • 一酸化炭素 (CO) 解離のメカニズムを理解することは,F-Tプロセスを最適化するために不可欠です.
  • 以前の研究は,CO分離のための水素補助経路に焦点を当てていた.

研究 の 目的:

  • corrugated ruthenium (Ru) 表面での CO 解離のメカニズムを調査する.
  • 直接的なCO解離と水素補助経路のエネルギーバリアを比較する.
  • 特定のRu表面構造のF-Tプロセスの主要な開始ステップを決定する.

主な方法:

  • 波紋 Ru 表面での CO 解離の計算モデリング.
  • COの直接解離を含む反応経路の分析.
  • 直接的なCO分離と水素補助経路 (HCOまたはCOH中間体経由) のエネルギーバリアの比較.

主要な成果:

  • 六重の場所を持つ波紋Ru表面の直接CO分離は,エネルギーバリアが著しく低くなります.
  • 水素補助経路 (HCOまたはCOH経由) は,より高いエネルギーバリアを提供します.

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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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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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Analyzing Protein Dynamics Using Hydrogen Exchange Mass Spectrometry
11:37

Analyzing Protein Dynamics Using Hydrogen Exchange Mass Spectrometry

Published on: November 29, 2013

関連する実験動画

Last Updated: Jun 20, 2026

Hydrogen Production and Utilization in a Membrane Reactor
10:00

Hydrogen Production and Utilization in a Membrane Reactor

Published on: March 10, 2023

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
08:40

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

Published on: December 6, 2021

Analyzing Protein Dynamics Using Hydrogen Exchange Mass Spectrometry
11:37

Analyzing Protein Dynamics Using Hydrogen Exchange Mass Spectrometry

Published on: November 29, 2013

  • 提案されたメカニズムは,これらの表面でのFTプロセスの最初のステップを明確にします.

    • 結論:

    • 波紋 Ru 表面および活性六重部位を有するナノ粒子のF-T プロセスは,直接のCO 解離によって開始されます.
    • 直接的なCO解離は,水素化された中間物質よりも運動的に優れている.
    • この発見は,より効率的なF-T触媒の設計のための基本的な理解を提供します.