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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

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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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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...
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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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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.
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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...
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For many years, scientists thought that enzyme-substrate binding took place in a simple "lock-and-key" fashion. This model stated that the enzyme and substrate fit together perfectly in one instantaneous step. However, current research supports a more refined view scientists call induced fit. The induced-fit model expands upon the lock-and-key model by describing a more dynamic interaction between enzyme and substrate. As the enzyme and substrate come together, their interaction causes...
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Ru-W对位点使得集体催化剂能够有效地促进的进化.

Weilong Ma1, Xiaoyu Yang2, Dingding Li1

  • 1International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics and Photon-Technology, Northwest University, Xi'an, Shaanxi, 710069, China.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|July 12, 2023
PubMed
概括

在性介质中开发高效的演化反应 (HER) 催化剂是关键. 这项研究在WO2纳米颗粒上引入了Ru-W对位点,证明了优越的HER活性和稳定性.

关键词:
鲁是一个原子的单原子.在Ru-W配对站点.有效的进化演变.优化基本步骤的优化

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科学领域:

  • 材料科学 材料科学 材料科学
  • 电化学 电化学 电化学
  • 催化剂是一种催化剂.

背景情况:

  • 在性介质中高效的演化反应 (HER) 对清洁能源生产至关重要.
  • 同时优化水解离和组合等基本步骤仍然是一个重大挑战.

研究的目的:

  • 开发高效的性HER电催化剂,使用原子分散的Ru-W对位点.
  • 为了研究Ru-W站点的协同效应,以提高催化性能.

主要方法:

  • 通过结晶格子受限的策略合成Ru单原子合的WO2纳米粒子 (Ru-W/WO2-800).
  • 电化学表征以评估HER活性,包括超电位,质量活性和稳定性.
  • 综合催化机制的分析,包括组合催化.

主要成果:

  • Ru-W/WO2-800表现出极好的HER活性,在10mA cm-2.2时具有11mV的低超电位.
  • 实现了高质量活动 (5863 mA mg-1 Ru在50 mV) 和强大的稳定性 (500 h在250 mA cm-2).
  • 证明了W位点促进基转移和水解离的协同效应,而Ru位点增强的组合.

结论:

  • 开发的Ru-W/WO2-800催化剂对性HER具有显著的效率.
  • 集体催化涉及协同的Ru-W对站点对于优化基本步骤至关重要.
  • 这项工作提出了一个有前途的策略,用于设计原子级催化剂,以实现高效的电催化.