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相关概念视频

Catalysis02:50

Catalysis

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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.
27.6K
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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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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Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

12.6K
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...
12.6K
Catalytically Perfect Enzymes01:07

Catalytically Perfect Enzymes

4.1K
The theory of catalytically perfect enzymes was first proposed by W.J. Albery and J. R. Knowles in 1976. These enzymes catalyze biochemical reactions at high-speed. Their catalytic efficiency values range from 108-109 M-1s-1. These enzymes are also called 'diffusion-controlled' as the only rate-limiting step in the catalysis is that of the substrate diffusion into the active site. Examples include triose phosphate isomerase, fumarase, and superoxide dismutase.
 
Most enzymes...
4.1K
Turnover Number and Catalytic Efficiency01:19

Turnover Number and Catalytic Efficiency

10.8K
The turnover number of an enzyme is the maximum number of substrate molecules it can transform per unit time. Turnover numbers for most enzymes range from 1 to 1000 molecules per second. Catalase has the known highest turnover number, capable of converting up to 2.8×106 molecules of hydrogen peroxide into water and oxygen per second. Lysozyme has the lowest known turnover number of half a molecule per second.
Chymotrypsin is a pancreatic enzyme that breaks down proteins during digestion....
10.8K
Predicting Reaction Outcomes02:24

Predicting Reaction Outcomes

8.7K
Kinetics describes the rate and path by which a reaction occurs. In contrast, thermodynamics deals with state functions and describes the properties, behavior, and components of a system. It is not concerned with the path taken by the process and cannot address the rate at which a reaction occurs. Although it does provide information about what can happen during a reaction process, it does not describe the detailed steps of what appears on an atomic or a molecular level. On the other hand,...
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相关实验视频

Updated: Sep 17, 2025

Combustion Characterization and Model Fuel Development for Micro-tubular Flame-assisted Fuel Cells
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Combustion Characterization and Model Fuel Development for Micro-tubular Flame-assisted Fuel Cells

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化学燃料驱动的联网催化机械

Amit Ghosh1, Sohom Kundu1, Michael Schmittel1

  • 1Center of Micro- and Nanochemistry and Engineering, Organische Chemie I, Adolf-Reichwein-Str. 2, Siegen, D-57068, Germany.

Chemistry (Weinheim an der Bergstrasse, Germany)
|July 2, 2025
PubMed
概括
此摘要是机器生成的。

这项研究介绍了网络分子机械,它结合了化学燃料驱动的通信和催化. 它展示了脉冲,时间编程的催化,模仿生物复杂性.

关键词:
化学燃料是一种化学燃料.分子机器分子机器罗托阿克桑的使用方法超分子化学 超分子化学可切换的催化剂.

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

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Combustion Characterization and Model Fuel Development for Micro-tubular Flame-assisted Fuel Cells
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Combustion Characterization and Model Fuel Development for Micro-tubular Flame-assisted Fuel Cells

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Biomass Conversion to Produce Hydrocarbon Liquid Fuel Via Hot-vapor Filtered Fast Pyrolysis and Catalytic Hydrotreating
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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

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科学领域:

  • 超分子化学 超分子化学
  • 化学工程是化学工程的重要组成部分.
  • 催化剂是一种催化剂.

背景情况:

  • 网络分子机器代表了创建具有可编程功能的复杂系统的前沿.
  • 在这些机器中整合通信和催化是先进应用的关键.
  • 以前的系统缺乏在这里展示的动态,燃料驱动的控制.

研究的目的:

  • 开发一种新的网络分子机器,集成化学燃料驱动的通信和催化.
  • 为了证明脉冲运行和时间编程的催化活性.
  • 模仿生物系统的复杂性和响应能力.

主要方法:

  • 使用了一个自排序系统,包括六环,一个带银的受体,和一个 [2]rotaxane (NetState-I).
  • 用2 - - 2 - 烯酸作为化学燃料,触发分子转位事件.
  • 使用动力测量 (k298 = 176 kHz) 来量化短暂生成的白银 ((I) [2]rotaxane的催化活性.

主要成果:

  • 证明了一种级联过程,在添加化学燃料时涉及Zn2+和Ag(I) 离子的转移.
  • 展示了白银的催化活性 (I) 在最初的网络状态下被掩盖,并在转移时被激活.
  • 通过使用燃料驱动系统,成功催化了2-alkynylbenzaldoxime的6-endo循环.

结论:

  • 通过综合化学通信和催化,在网络分子机械方面取得了关键进展.
  • 通过脉冲操作建立了级联信号传输和时间编程催化的一种新型范式.
  • 强调了用合成分子机器模仿生物系统复杂性的潜力.