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相关概念视频

Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

946
Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
946
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

3.2K
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...
3.2K
Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

11.8K
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...
11.8K
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

20.6K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
20.6K
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

7.6K
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.
7.6K
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

2.3K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.3K

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相关实验视频

Updated: Jun 5, 2025

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
10:57

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

Published on: April 10, 2018

18.1K

铁素功能化的原子精密金属集群对CO2电还原具有协同增强的性能.

Guocheng Deng1,2, Hyewon Yun1,3, Yuping Chen4

  • 1Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul, 08826, Republic of Korea.

Angewandte Chemie (International ed. in English)
|December 4, 2024
PubMed
概括

我们开发了一种新的混合纳米催化剂 (Ag9Cu6-Fc) 用于二氧化碳的电还原. 这种催化剂实现了100%的二氧化碳选择性和高电流密度,超过了以前的基准.

关键词:
二氧化碳的电还原 CO2 的电还原.集群综合的集群综合集群集群是指一个集群的集群.铁烯酸铁烯酸铁烯酸铁烯酸是什么模型催化剂模型催化剂

更多相关视频

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

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Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy
07:36

Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy

Published on: November 9, 2019

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相关实验视频

Last Updated: Jun 5, 2025

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
10:57

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

Published on: April 10, 2018

18.1K
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

3.5K
Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy
07:36

Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy

Published on: November 9, 2019

7.9K

科学领域:

  • 纳米催化剂的使用方法
  • 有机金属化学 有机金属化学
  • 电化学 电化学 电化学

背景情况:

  • 混合纳米催化剂结合有机金属化合物和金属纳米粒子,以提高功能.
  • 金属集群具有独特的催化性能,但可以通过功能化进一步改进.

研究的目的:

  • 为了合成和描述一种新的混合纳米催化剂,将一个原子精确的金属集群 (Ag9Cu6) 与基烯分子 (Fc) 集成在一起.
  • 为了研究Ag9Cu6-Fc混合催化剂在CO2电还原中的增强催化性能.
  • 阐明铁功能化对催化活性和选择性的协同效应.

主要方法:

  • 合成原子精确的Ag9Cu6金属集群.
  • 基烯分子与Ag9Cu6集群的集成,形成Ag9Cu6-Fc混合催化剂.
  • 使用膜电极组装电池中的Ag9Cu6-Fc催化剂对CO2减少的电催化评估.
  • 运行实验和计算研究以了解催化机制.

主要成果:

  • 与非功能化的Ag9Cu6集群相比,Ag9Cu6-Fc混合催化剂显示出显著增强的CO2电减活性和选择性.
  • 实现了创纪录的高CO法拉达效率100%和工业级CO部分电流密度为-680mA/cm2.
  • 通过乙烯基桥和独特的局部化学环境建立了连续的电子传输通道.

结论:

  • 铁素功能化协同改善了二氧化碳电还原的金属集群的催化性能.
  • 开发的Ag9Cu6-Fc混合纳米催化剂代表了能源转化技术的重大进步.
  • 这项工作突出了金属-有机金属混合纳米粒子在催化中的潜力.