空间分离的活性位点使得对氧化物催化剂的选择性CO氧化反应成为可能
Yijing Liu1,2, Le Lin1, Liang Yu1
1State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
The journal of physical chemistry letters
|October 26, 2023
概括
研究人员发现,在超薄的氧化 (Mn3O4) 表面上的空间分离的活性位点能够在 (H2) 上选择性氧化一氧化碳 (CO). 这一发现促进了对选择性氧化反应的非贵金属催化剂的理解.
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
- 表面化学 表面化学
背景情况:
- 开发高效的非贵金属催化剂用于选择性氧化对于许多工业过程至关重要.
- 了解氧化物催化反应中选择性的起源往往是具有挑战性的.
研究的目的:
- 确定控制氧化催化剂选择性氧化反应的原子级机制.
- 阐明表面结构在实现碳氧化对H2的选择性方面的作用.
主要方法:
- 使用高压表面成像技术.
- 进行理论计算,分析反应路径和能量障碍.
- 研究过超薄的氧化 (Mn3O4) 表面.
主要成果:
- 在Mn3O4.4上确定了O2激活和H2吸附的空间分离的活性位点.
- 证明,与CO反应相比,H2分离和扩散面临更高的能量障碍.
- 揭示了CO可以通过Eley-Rideal机制直接与吸附的O2发生反应.
结论:
- 在Mn3O4表面上的空间分离的活性位点是选择性CO氧化H2的关键.
- Mn-O和Mn-Mn对的独特安排决定了反应选择性.
- 提供了对氧化物催化剂结构依赖的选择性氧化进行原子层面的洞察.
相关概念视频
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
10.3K
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.
10.3K
Oxidative Cleavage of Alkenes: Ozonolysis
10.5K
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.
10.5K
Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate
11.7K
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.
11.7K
Catalysis
27.0K
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.
27.0K
Phase I Oxidative Reactions: Overview
282
Phase I biotransformation, or functionalization, is a crucial chemical process that converts drugs and other xenobiotics into more water-soluble forms, facilitating expulsion from the body. It involves oxidative, reductive, and hydrolytic reactions that add or unveil polar functional groups on lipophilic substrates. Key players in phase I reactions are the mixed-function oxidases. Situated in liver cell microsomes, these enzymes predominantly carry out drug metabolism. They require molecular...
282
Sharpless Epoxidation
4.0K
The conversion of allylic alcohols into epoxides using the chiral catalyst was discovered by K. Barry Sharpless and is known as Sharpless epoxidation. The use of a chiral catalyst enables the formation of one enantiomer of the product in excess. This chiral catalyst is mainly a chiral complex of titanium tetraisopropoxide and tartrate ester (specific stereoisomer). The stereoisomer used in the chiral catalyst dictates the formation of the enantiomer of the product. In other words, the use of...
4.0K


