Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

13.9K
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...
13.9K
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

3.8K
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...
3.8K
Catalysis02:50

Catalysis

30.0K
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.
30.0K
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

8.9K
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.
8.9K
Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation01:28

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

5.7K
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...
5.7K
Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride01:26

Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride

2.2K
Radical substitution reactions can be used to remove functional groups from molecules. The hydrogenolysis of alkyl halides is one such reaction, where the weak Sn–H bond in tributyltin hydride reacts with alkyl halides to form alkanes. Here, the reagent Bu3SnH yields tributyltin halide as a byproduct.
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation reactions,...
2.2K

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

Recent Advances in Transition Metal-Based Catalysts and Strategies for Promoting Alkaline Water Electrolysis.

ChemSusChem·2026
Same author

Electrocatalytic methane oxidation <i>via</i> integrated design of mechanism, microenvironment, and mass transfer.

Chemical science·2026
Same author

Oxygen vacancy-rich spinel oxide drives phenol polymerization via direct oxidative transfer.

Environmental science and ecotechnology·2026
Same author

Spin-Dominated Reconstruction Kinetics in Prussian Blue Analog Enables Efficient Seawater Splitting.

Angewandte Chemie (International ed. in English)·2026
Same author

Suppressing Charge Screening via Z-Scheme With Polarization Field for In Situ H<sub>2</sub>O<sub>2</sub> Generation and Utilization.

Advanced materials (Deerfield Beach, Fla.)·2026
Same author

Electronic Metal-Support Interaction in Pt/Co<sub>3</sub>O<sub>4</sub> Enhanced Lattice Oxygen Activation and Replenishment for Photothermocatalytic VOC Oxidation.

Environmental science & technology·2026

相关实验视频

Updated: Jan 12, 2026

Hydrogen Production and Utilization in a Membrane Reactor
10:00

Hydrogen Production and Utilization in a Membrane Reactor

Published on: March 10, 2023

3.1K

原子介导的高效电催化剂化反应

Lei Tian1,2, Meng-Ying Yin1,2, Xing-Yuan Xia1,2

  • 1National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource Utilization, Nanchang Hangkong University, Nanchang, 330063, P. R. China.

Advanced materials (Deerfield Beach, Fla.)
|November 6, 2025
PubMed
概括

一项新的战略平衡了原子 (H*) 在电催化中的供需,提高了化物,酸盐,二氧化碳和O2减排的效率. 这种方法提高了阴极稳定性和材料合成,用于还原反应.

关键词:
原子是原子中的一种.电催化化反应的电催化化反应消极化是一种被动化.供需平衡是供需平衡的重要组成部分.最终的氧气原子 终端的氧气原子

更多相关视频

A Simple, Low-cost, and Robust System to Measure the Volume of Hydrogen Evolved by Chemical Reactions with Aqueous Solutions
06:32

A Simple, Low-cost, and Robust System to Measure the Volume of Hydrogen Evolved by Chemical Reactions with Aqueous Solutions

Published on: August 17, 2016

20.3K
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

4.1K

相关实验视频

Last Updated: Jan 12, 2026

Hydrogen Production and Utilization in a Membrane Reactor
10:00

Hydrogen Production and Utilization in a Membrane Reactor

Published on: March 10, 2023

3.1K
A Simple, Low-cost, and Robust System to Measure the Volume of Hydrogen Evolved by Chemical Reactions with Aqueous Solutions
06:32

A Simple, Low-cost, and Robust System to Measure the Volume of Hydrogen Evolved by Chemical Reactions with Aqueous Solutions

Published on: August 17, 2016

20.3K
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

4.1K

科学领域:

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

背景情况:

  • 原子 (H*) 对于电催化化至关重要,但过量导致自,降低效率和阴极稳定性.
  • 控制H*生产是优化电催化还原反应的关键.

研究的目的:

  • 通过平衡H*的供需,制定一种提高电催化化效率的通用战略.
  • 调查硫接种氧化物 (Co3O4-S) 对H*产生和利用的影响.

主要方法:

  • 合成了Co3O4-S,通过将硫接种到Co3O4上,使终端氧位被动化.
  • 在Co3O4-S.上研究了H*生成的自由能量变化.
  • 评估了对化物,酸盐,二氧化碳和O2减少的电催化性能.

主要成果:

  • Co3O4-S使H*生成的自由能量从0.17增加到0.41 eV,调节了其生产率.
  • 的供需平衡显著改善了化物的深化 (FE:19.6%至45.3%).
  • 在酸盐减少 (FE:83%至100%),CO2减少 (FE:25.1%至51.7%) 和O2减少 (转移电子:2.6至3.6) 方面观察到更高的效率.

结论:

  • 拟议的战略有效地平衡了H*的供需,抑制了自和提高了电催化降低效率.
  • Co3O4-S对实际应用具有很好的潜力,包括含有化物的废水处理.
  • 这项工作为设计高效和稳定的电催化电极材料提供了一种新方法.