一种子气相似物的氧化,使用由V-doped mesoporous silica催化的化/O2系统
Stephanie R Livingston1, Christopher C Landry
1University of Vermont, Department of Chemistry, 82 University Place, Burlington, Vermont 05405, USA.
Journal of the American Chemical Society
|September 11, 2008
概括
添加的二氧化有效地通过激进机制催化末气模拟氧化. 催化剂保持稳定,在专用溶剂中没有液,这表明其具有安全化学降解的潜力.
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
- 化学工程是化学工程的重要组成部分.
背景情况:
- 末气相似物构成重大化学威胁.
- 开发有效和稳定的催化剂来降解它们至关重要.
- 不同质的催化剂在分离和重复使用方面具有优势.
研究的目的:
- 为了研究添加的半孔二氧化作为2-chloroethyl乙烯硫化物 (CEES) 氧化的催化剂.
- 阐明反应机制,包括激进的参与.
- 评估催化剂的稳定性和浸出行为.
主要方法:
- 不同质的催化使用添加的半孔二氧化.
- 氧化CEES与和分子氧.
- 使用激素清除剂的反应机制研究.
- 化学分析用于泄漏.
主要成果:
- 添加的半孔酸盐有效催化了CEES氧化.
- 一个激进的机制被证实存在一个诱导期与激进的清洁者.
- 最初选择性氧化到CEESO,然后进一步氧化到硫.
- 在HFE-7100溶剂中没有观察到的泄漏.
结论:
- 添加的半孔二氧化是CEES降解的有希望的异质催化剂.
- 反应通过激素路径进行.
- 催化剂表现出极好的稳定性和最小的液,这对于实际应用至关重要.
相关概念视频
02:44Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
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.
01:46Oxidative Cleavage of Alkenes: Ozonolysis
In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
02:21Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate
Alkenes can be dihydroxylated using potassium permanganate. The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
02:37Oxidation of Alcohols
In this lesson, the oxidation of alcohols is discussed in depth. The various reagents used for oxidation of primary and secondary alcohols are detailed, and their mechanism of action is provided.
The process of oxidation in a chemical reaction is observed in any of the three forms:
The process of oxidation in a chemical reaction is observed in any of the three forms:
02:04Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids
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.
01:15Oxidations of Aldehydes and Ketones to Carboxylic Acids
Oxidation of aldehydes and ketones results in the formation of carboxylic acids. Aldehydes, bearing hydrogen next to the carbonyl group, are easily oxidized compared to ketones. This is because an aldehydic proton can easily be abstracted during oxidation.
Aldehydes readily undergo oxidation in strong oxidizing agents such as potassium permanganate and chromic acid. The oxidation can also be carried out using mild oxidizing agents such as silver oxide. In fact, aldehydes can be easily oxidized...
Aldehydes readily undergo oxidation in strong oxidizing agents such as potassium permanganate and chromic acid. The oxidation can also be carried out using mild oxidizing agents such as silver oxide. In fact, aldehydes can be easily oxidized...