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: 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

30.1K
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.
30.1K
Regioselectivity of Electrophilic Additions-Peroxide Effect02:35

Regioselectivity of Electrophilic Additions-Peroxide Effect

10.2K
In the presence of organic peroxides, the addition of hydrogen bromide to an alkene yields the isomer that is not predicted by Markovnikov’s rule. For example, the addition of hydrogen bromide to 2-methylpropene in the presence of peroxides gives 1-bromo-2-methylpropane. This addition reaction proceeds via a free radical mechanism, which reverses the regioselectivity. The free radical reaction mechanism involves three stages: initiation, propagation, and termination.
10.2K
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

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

Biomass-Derived Amorphous Carbon with Intrinsic Nitrogen Doping for Hydrogen Peroxide Electrosynthesis.

ACS omega·2026
Same author

A Novel Sol-Gel Synthesis Strategy of Co-Based Sillenite Composites for Enhanced Electrocatalysis of Water Splitting.

ACS omega·2026
Same author

Combining Mesoporosity and Shape Selectivity in FAU-MFI Interzeolite Intermediates for Renewable Xylenes Production.

ACS sustainable chemistry & engineering·2026
Same author

Enhancing Hydrocracking Catalyst Performance and Lifetime through Surfactant-Templated Mesoporosity in Pt/HUSY Zeolites.

Energy & fuels : an American Chemical Society journal·2026
Same author

Biosurfactants Contribute to Distiller's Corn Oil Recovery during Ethanol Production.

ACS omega·2026
Same author

Co<sub>(1-<i>x</i>-<i>y</i>)</sub>Fe <sub><i>x</i></sub> Zn <sub><i>y</i></sub> ‑Glycerolate Microspheres as Electrocatalysts for the Oxygen Evolution Reaction.

ACS applied energy materials·2025

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

使用基于AgPd的电催化剂与超低Pd负载的高度选择性过氧化生产.

Eleilde S Oliveira1, Fellipe S Pereira2, Jaynne S Martins1

  • 1Department of Chemistry, Federal University of Maranhão (UFMA), São Luís 65080-805, MA, Brazil.

ACS omega
|November 3, 2025
PubMed
概括

这项研究开发了一种新的碳 (AgPd/C) 电催化剂,用于高效的过氧化 (H2O2) 生产. 催化剂具有很高的选择性和稳定性,为绿色化学过程提供了具有成本效益的解决方案.

更多相关视频

Author Spotlight: Design and Evaluation of Au-Electroplated Carbon Fiber Cloth Electrodes for Hydrogen Peroxide Fuel Cells
06:39

Author Spotlight: Design and Evaluation of Au-Electroplated Carbon Fiber Cloth Electrodes for Hydrogen Peroxide Fuel Cells

Published on: October 20, 2023

3.8K
A Continuous-flow Photocatalytic Reactor for the Precisely Controlled Deposition of Metallic Nanoparticles
11:49

A Continuous-flow Photocatalytic Reactor for the Precisely Controlled Deposition of Metallic Nanoparticles

Published on: April 10, 2019

10.2K

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
Author Spotlight: Design and Evaluation of Au-Electroplated Carbon Fiber Cloth Electrodes for Hydrogen Peroxide Fuel Cells
06:39

Author Spotlight: Design and Evaluation of Au-Electroplated Carbon Fiber Cloth Electrodes for Hydrogen Peroxide Fuel Cells

Published on: October 20, 2023

3.8K
A Continuous-flow Photocatalytic Reactor for the Precisely Controlled Deposition of Metallic Nanoparticles
11:49

A Continuous-flow Photocatalytic Reactor for the Precisely Controlled Deposition of Metallic Nanoparticles

Published on: April 10, 2019

10.2K

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:

  • 有效的电催化剂对于通过氧降解反应 (ORR) 产生过氧化 (H2O2) 是至关重要的.
  • 目前的挑战包括高材料成本和ORR催化剂的效率有限.
  • 开发具有选择性和成本效益的催化剂对于推进H2O2合成至关重要.

研究的目的:

  • 开发和评估一种具有超低 (Pd) 负载的双金属AgPd/C电催化剂,用于选择性H2O2生产.
  • 研究合成的AgPd/C电催化剂的催化性能和稳定性.
  • 探索这种催化剂在绿色化学应用中的潜力.

主要方法:

  • 在Vulcan XC-72碳支上使用电替代方法合成AgPd/C电催化剂.
  • 通过对Ag和Pd的原子排列,优化活性点分散和导电性.
  • 电化学分析以评估H2O2选择性,催化活性和甲醇交叉电阻.

主要成果:

  • 在特定的电位范围内,AgPd/C电催化剂实现了显著的H2O2选择性 (>75%).
  • 与商业Pt/C电催化剂相比,证明了对甲醇交叉的优越抵抗力.
  • 催化剂对两电子ORR机制具有增强的选择性,并减少了电还原启动能量.

结论:

  • 超低Pd负载的AgPd/C电催化剂对通过ORR产生H2O2具有高度选择性.
  • 替代合成方法产生了有利于选择性2e− ORR的表面结构.
  • 这种催化剂为绿色化学过程中的H2O2合成提供了一个有希望的,具有成本效益的替代方案.