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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.
26.8K
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
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

10.1K
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
10.1K
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
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

2.1K
Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
2.1K
Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids02:04

Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids

5.7K
Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.
5.7K

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相关实验视频

Updated: Jun 22, 2025

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

Published on: July 18, 2017

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强大的Ru/Ce@Co催化剂具有针对氧化进行优化的支结构.

Aiyong Wang1, Jiajia Ding1, Mingqi Li1

  • 1State Key Laboratory of Green Chemical Engineering and Industrial Catalysis, Research Institute of Industrial Catalysis, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China.

Environmental science & technology
|July 3, 2024
PubMed
概括
此摘要是机器生成的。

一种新的Ru/Ce@Co催化剂有效氧化了,一种挥发性有机化合物 (VOC),提高了稳定性. 这种结构化催化剂克服了用于工业应用的短链烯燃烧方面的挑战.

关键词:
氧化氧化物是什么?氧化机制的氧化机制气氧化过程中的气氧化.催化剂是一种催化剂.支持效应是一种支持效应.

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Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
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Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction

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Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether
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Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation
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Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation

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Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
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Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction

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Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether
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科学领域:

  • 催化剂是一种催化剂.
  • 材料科学 材料科学 材料科学
  • 环境化学环境化学

背景情况:

  • 短链基,如,由于其稳定性和低极性,难以催化氧化.
  • 基于的催化剂表现出高活性,但由于活性RuO2物种的氧化和烧结而遭受失活.
  • 氧化催化剂的工业应用受到长期稳定性不佳的阻碍.

研究的目的:

  • 开发一种高活性,稳定的氧化催化剂.
  • 研究一种新型结构化催化剂,防止活性物种的失活.
  • 增强短链基的催化燃烧,包括挥发性有机化合物 (VOC).

主要方法:

  • 合成一种独特的Ru/Ce@Co催化剂,在Co3O4上使用二氧化 (CeO2) 作为薄层,在CeO2.2上分散着 (Ru) 纳米粒子.
  • 气与Ru/Ce@Co,Ru/CeO2和Ru/Co3O4催化剂的催化氧化比较试验.
  • 评估各种恶劣条件下的催化剂性能,包括反应循环,高空间速度,湿度和高温.

主要成果:

  • 与Ru/CeO2和Ru/Co3O4相比,Ru/Ce@Co催化剂表现出较高的催化活性和稳定性,用于氧化.
  • 即使在恶劣的操作条件下,催化剂也保持了出色的性能,证明了其强度.
  • 特殊的结构促进了Ru物种在CeO2上强烈固定,保持低价值状态并增强气和氧气吸附/激活.

结论:

  • 设计的Ru/Ce@Co催化剂为短链基的高效催化燃烧提供了一种新且有效的策略.
  • 独特的纳米结构增强了鲁物种的稳定性和活性,克服了以前的限制.
  • 这种方法在减少挥发性有机化合物和能源转换方面具有重要的工业应用潜力.