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 Benzene to Cyclohexane: Catalytic Hydrogenation01:28

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

4.6K
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...
4.6K
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

3.3K
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...
3.3K
Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

12.0K
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...
12.0K
Catalysis02:50

Catalysis

26.9K
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.
26.9K
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

7.7K
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.
7.7K
Hydrolysis of Chlorobenzene to Phenol: Dow Process01:10

Hydrolysis of Chlorobenzene to Phenol: Dow Process

2.8K
Simple aryl halides do not react with nucleophiles under normal conditions. However, the reaction can proceed under drastic conditions involving high temperatures and high pressure to give the substituted products. For example, chlorobenzene is converted to phenol using aqueous sodium hydroxide at 350 °C under high pressure by the Dow process. The reaction follows an elimination-addition mechanism involving a benzyne intermediate. Here, the chloride ion is...
2.8K

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

Platinum-based chemotherapy in metastatic castration-resistant prostate cancer: a narrative review and dual stratification framework based on HRR genotype and aggressive-variant/neuroendocrine phenotype.

International urology and nephrology·2026
Same author

Unconventional Phase Shift in Spin Hall Magnetoresistance of Antiferromagnetic Insulators.

ACS applied materials & interfaces·2026
Same author

Preferential B-Site Fe Substitution Enables Defect-Mediated Grain Growth and Domain Engineering in (K, Na)NbO<sub>3</sub>-Based Lead-Free Ceramics.

ACS applied materials & interfaces·2026
Same author

Case Report: Complement-mediated thrombotic microangiopathy masquerading as a pancreatic mass.

Frontiers in medicine·2026
Same author

Temozolomide-based therapy may remodel the tumor microenvironment and enhance immunotherapy sensitivity in advanced leiomyosarcoma.

Anti-cancer drugs·2026
Same author

Efficacy and Safety of Anthracyclines Combined with Temozolomide Regimens for the Treatment of Advanced Leiomyosarcoma: A Retrospective Study.

Therapeutics and clinical risk management·2026

相关实验视频

Updated: Jul 6, 2025

Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether
09:21

Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether

Published on: August 17, 2019

9.0K

缺陷的双烯作为高效的进化催化剂

Yi Luo1,2, Yiqiang He1, Yunfei Ding1

  • 1School of Mechanical Engineering, Jiangsu Ocean University, Lianyungang 222005, China.

Inorganic chemistry
|December 31, 2023
PubMed
概括

缺陷的双烯显示出很大的希望,作为水分裂的无金属电催化剂. 工程缺陷显著提高了进化反应效率,在可持续生产的关键指标上超过了白金.

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

19.6K
Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation
10:19

Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation

Published on: July 18, 2017

12.0K

相关实验视频

Last Updated: Jul 6, 2025

Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether
09:21

Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether

Published on: August 17, 2019

9.0K
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

19.6K
Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation
10:19

Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation

Published on: July 18, 2017

12.0K

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
  • 可持续能源 可持续能源

背景情况:

  • 电催化剂对于高效的水分和生产至关重要.
  • 开发具有成本效益和高性能的催化剂对于可持续的能源解决方案至关重要.
  • 无金属催化剂为基于贵金属的材料提供了替代品.

研究的目的:

  • 研究缺陷双烯作为进化反应 (HER) 的电催化剂的潜力.
  • 评估缺陷工程对双烯基材料的催化活性和稳定性的影响.
  • 探索地球上丰富的新型碳基催化剂,用于可持续的生产.

主要方法:

  • 使用第一原理模拟系统地研究缺陷双烯的结构,稳定性和电子特性.
  • 计算评估了吉布斯自由能量和交换电流密度,用于进化反应.
  • 确定了首选的反应机制 (Volmer-Heyrovsky) 和它的能量屏障.

主要成果:

  • 与相比,具有双空缺缺陷的双烯对HER具有优越的电催化活性.
  • 缺陷的双烯表现出 -0.08 eV的吉布斯自由能量和 -3.08 A cm-2.2的交换电流密度.
  • 在进化反应中,对Volmer-Heyrovsky机制确定了0.80 eV的低能量屏障.

结论:

  • 双烯的缺陷工程显著提高了进化的电催化性能.
  • 缺陷的双烯代表了一类有前途的无金属,碳基电催化剂.
  • 这项研究提供了一条可行的途径,通过水分离来实现可持续和成本效益的生产.