通过动态分析,阐明宁衍生氧化物的竞争性氧化与散装MoO3催化剂之间的关系
Mahmudul H Khan1,2, Zeinab H Fard1, Andrew J Kohler1
1Department of Chemical and Biological Engineering, Iowa State University, Ames, Iowa 50011, United States.
概括
这项研究研究了使用氧化催化剂的氧化的素化合物. 乙强烈抑制了异转化,表明乙.
科学领域:
- 催化剂是一种催化剂.
- 化学工程是化学工程的重要组成部分.
- 材料科学 材料科学 材料科学
背景情况:
- 素衍生氧酸盐的氧化 (HDO) 对于可持续的化学生产至关重要.
- 当前的研究经常使用单化合物系统,限制了对复杂反应环境的理解.
- 氧化催化剂在生产与石化相容的化学品方面表现有前途.
研究的目的:
- 分析在氧化催化剂上对乙烯酸和亚尼索尔的同时氧化.
- 在多组件系统中研究竞争性吸附和运动效应.
- 了解氧化物结构对吸附和反应性的影响.
主要方法:
- 在330°C和低部分压力下同时进行乙和亚尼索尔的气相氧化.
- 动力分析以确定速度顺序和抑制效应.
- 根据动力学数据估计相对吸附常数.
主要成果:
- 乙显著抑制了anisole HDO,以负率顺序 (-0.97).
- 阿尼索尔对乙HDO的影响很小 (速率顺序为-0.07).
- 乙的吸附倾向比醇高6.4倍,这表明氧化基性和吸附之间存在火山形状的关系.
结论:
- 竞争性吸附在多氧化HDO系统中起着至关重要的作用.
- 氧化物结构,特别是氧原子周围的电子密度,影响吸附强度.
- 结果为设计更高效的生物质转化催化剂提供了洞察力.
相关概念视频
Hydroboration-Oxidation of Alkenes
11.1K
In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
11.1K
Oxidative Cleavage of Alkenes: Ozonolysis
12.8K
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.
12.8K
Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate
16.4K
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.
16.4K
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
12.6K
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.
12.6K
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
Preparation of Alcohols via Addition Reactions
7.3K
Overview
The acid-catalyzed addition of water to the double bond of alkenes is a large-scale industrial method used to synthesize low-molecular-weight alcohols. An acidic atmosphere is required to allow the hydrogen in the water molecule to act as an electrophile and attack the double bond in an alkene. The addition of a proton to the double bond creates a carbocation intermediate. The proton preferentially bonds to the less substituted end of the double bond to create a more stable carbocation...
The acid-catalyzed addition of water to the double bond of alkenes is a large-scale industrial method used to synthesize low-molecular-weight alcohols. An acidic atmosphere is required to allow the hydrogen in the water molecule to act as an electrophile and attack the double bond in an alkene. The addition of a proton to the double bond creates a carbocation intermediate. The proton preferentially bonds to the less substituted end of the double bond to create a more stable carbocation...
7.3K


