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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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Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

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Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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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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Oxidation and Reduction of Organic Molecules01:19

Oxidation and Reduction of Organic Molecules

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Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
The removal of an electron from a molecule, results in a...
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Oxidative Cleavage of Alkenes: Ozonolysis01:46

Oxidative Cleavage of Alkenes: Ozonolysis

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In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
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Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

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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.
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氧降解反应的工程分子异构催化剂

Chang Chen1,2, Yifan Li2,3, Aijian Huang1,4

  • 1Engineering Research Center of Advanced Rare Earth Materials, Department of Chemistry, Tsinghua University, Beijing 100084, China.

Journal of the American Chemical Society
|September 20, 2023
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概括

这项研究引入了一种新的无热解方法,用于在金属碳催化剂中创建二原子位点 (DAS),特别是FeCo分子异构结构 (FeCo-MHs). 这些FeCo-MH显示了燃料电池和电池的异常氧降解反应活性.

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科学领域:

  • 材料科学
  • 电化学
  • 催化剂

背景情况:

  • 具有二原子位点 (DAS) 的原子分散金属碳 (M-N-C) 催化剂增强了活性和稳定性.
  • 传统的DAS合成热解方法缺乏控制和精确的识别.
  • 在区分真实的DAS和虚假配置方面存在挑战.

研究的目的:

  • 开发一种可靠的,无热解的二原子站点 (DAS) 构建策略.
  • 合成和描述FeCo"分子异构结构" (FeCo-MHs) 作为一种新的DAS催化剂.
  • 阐明FeCo-MHs在氧降解反应中的结构活性关系.

主要方法:

  • 使用两步特定吸附策略,避免高温热解.
  • 使用现场旋转传输电子显微镜精确识别单个FeCo-MHs.
  • 对氧减少反应 (ORR) 的电化学性能进行了评估.

主要成果:

  • 通过控制的二原子位点成功合成FeCo-MH.
  • 使用现场旋转TEM证实了FeCo-MH的结构,排除了假阳性.
  • FeCo-MHs表现出调制的磁矩和低旋转的Fe ((II) -N4部分的比率增加.
  • 实现了0.95V的半波电位 (E1/2) 的异常ORR活动.

结论:

  • 没有热解的特异吸附策略是有效的,用于制造明确的DAS催化剂.
  • FeCo-MHs是高效氧降解反应的有希望的催化剂类.
  • 开发的催化剂显示了燃料电池和空气电池中高性能阴极的潜力.