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Catalysis02:50

Catalysis

32.1K
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.
32.1K
Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate02:21

Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate

17.9K
Alkenes can be dihydroxylated using potassium permanganate.  The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
17.9K
Heterogeneous Catalysis01:22

Heterogeneous Catalysis

87
Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
87
Microbes and Other Elemental Cycles01:24

Microbes and Other Elemental Cycles

42
Microbial activity plays a pivotal role in the biogeochemical cycling of iron and manganese, especially at the redox gradients characteristic of stratified aquatic environments. These cycles are driven by microbial transformations between oxidized and reduced forms of the metals, allowing organisms to exploit them for metabolic energy and structural purposes.Iron Cycling Across Redox GradientsIn neutral, oxygen-rich surface waters, iron is predominantly found in its oxidized, insoluble ferric...
42
Oxidation of Phenols to Quinones01:17

Oxidation of Phenols to Quinones

5.2K
In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
5.2K
Oxidation-Reduction Reactions03:11

Oxidation-Reduction Reactions

77.8K
Oxidation–Reduction Reactions
77.8K

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関連する実験動画

Updated: Mar 26, 2026

Photochemical Oxidative Growth of Iridium Oxide Nanoparticles on CdSe@CdS Nanorods
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Photochemical Oxidative Growth of Iridium Oxide Nanoparticles on CdSe@CdS Nanorods

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水酸化のために設計された五核鉄触媒

Masaya Okamura1,2, Mio Kondo1,2,3,4, Reiko Kuga1

  • 1Department of Life and Coordination-Complex Molecular Science, Institute for Molecular Science, Higashiyama 5-1, Myodaiji, Okazaki, Aichi 444-8787, Japan.

Nature
|February 11, 2016
PubMed
まとめ

研究者は効率的な水酸化触媒のための新しい五核鉄複合体を開発した. この触媒は以前の鉄基システムよりも 活動性が高く 合成燃料の生産を進めています

さらに関連する動画

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

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Preparation and Use of Photocatalytically Active Segmented Ag|ZnO and Coaxial TiO2-Ag Nanowires Made by Templated Electrodeposition
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Preparation and Use of Photocatalytically Active Segmented Ag|ZnO and Coaxial TiO2-Ag Nanowires Made by Templated Electrodeposition

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関連する実験動画

Last Updated: Mar 26, 2026

Photochemical Oxidative Growth of Iridium Oxide Nanoparticles on CdSe@CdS Nanorods
05:41

Photochemical Oxidative Growth of Iridium Oxide Nanoparticles on CdSe@CdS Nanorods

Published on: February 11, 2016

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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

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Preparation and Use of Photocatalytically Active Segmented Ag|ZnO and Coaxial TiO2-Ag Nanowires Made by Templated Electrodeposition
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Preparation and Use of Photocatalytically Active Segmented Ag|ZnO and Coaxial TiO2-Ag Nanowires Made by Templated Electrodeposition

Published on: May 2, 2014

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科学分野:

  • カタリシス
  • 材料科学
  • 再生可能エネルギー

背景:

  • 合成燃料の生産には水酸化が不可欠ですが,依然として瓶頸です.
  • 鉄は豊富で安価で 環境に害のない金属で 触媒の開発に役立ちます
  • 水酸化のための以前の単核鉄触媒は低活性と安定性を示した.

研究 の 目的:

  • 高活性で堅固な鉄基水酸化触媒を開発する.
  • 水酸化のための多核鉄複合体のメカニズムと還酸化特性を調査する.

主な方法:

  • 五核鉄複合体の合成と特徴付け
  • レドックス状態と触媒活性を決定する電気化学分析.
  • 量子化学の計算で 反応のメカニズムを理解する

主要な成果:

  • 五核鉄複合体は1,900s−1の回転頻度を達成し,他の鉄触媒よりも3度高い.
  • 触媒は6つの酸化状態でリドックス・フレキシビリティを示し,Fe ((III)) 5状態は水の酸化に有効である.
  • 量子化学は,隣接する活性部位によるO−O結合形成に対する低反応障壁を明らかにした.

結論:

  • リドックス・フレキシビリティと隣接する活性部位を持つ多核鉄複合体は,水酸化を効率的に触媒化することができる.
  • この研究は,人工光合成と太陽燃料生産のための鉄ベースの触媒の潜在能力を示しています.
  • 高超電位と水豊富な溶液の操作などの制限に対処するためにさらなる最適化が必要です.