在CeO2上制造高度分散的Ru催化剂,以实现高效的C3H6氧化
Bifeng Zhang1, Jiawei Yang1, Yibo Mu1
1State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Jiangsu Key Laboratory of Vehicle Emissions Control, Center of Modern Analysis, Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China.
Environmental science & technology
|September 26, 2024
概括
在氧化 (CeO2) 催化剂上的原子分散的 (Ru) 对挥发性有机化合物 (VOC) 氧化具有优越的性能,与聚合的Ru物种相比. 这一发现指导了用于消除VOC的高效催化剂的设计.
科学领域:
- 催化剂是一种催化剂.
- 环境化学环境化学
- 材料科学 材料科学 材料科学
背景情况:
- 挥发性有机化合物 (VOC) 构成重大环境和健康风险.
- 在氧化 (Ru/CeO2) 催化剂上支持的对于VOC消除至关重要.
- 对于VOC氧化剂的Ru/CeO2催化剂的精确活性点仍然不清楚.
研究的目的:
- 在CeO2上合成和比较原子分散和聚合Ru催化剂.
- 在VOC氧化中阐明Ru/CeO2催化剂的结构活性关系.
- 为了确定最具反应性的Ru物种以有效的C3H6氧化.
主要方法:
- 原子分散的Ru-CeO2-BTC催化剂的一步热水合成.
- 对于聚合的Ru/CeO2-BTC催化剂的常规初始湿度浸.
- (C3H6) 氧化作为一个模型反应,得到了先进的表征和机制研究的支持.
主要成果:
- 原子分散的Ruδ+物种在Ru-CeO2-BTC上具有Ru-O-Ce链接,比聚合的RuOx物种显示出明显更高的C3H6氧化活性.
- Ru-CeO2-BTC催化剂表现出增强的低温氧化还原特性.
- 通过原子分散的Ru.观察到C3H6的增强吸附/激活和中间体的分解/脱附.
结论:
- 原子分散的Rui离子,特别是具有Ru-O-Ce链接的Ruδ+,是对Ru/CeO2催化剂高效VOC氧化的主要活性位点.
- 卓越的性能归因于增强的低温氧化还原能力和改进的反应中间体管理.
- 这项研究为设计高效的Ru/CeO催化剂提供了关键的见解,用于VOCs的环境修复.
相关概念视频
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.2K
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...
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...
3.2K
02:50Catalysis
26.7K
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.
26.7K
01:13Olefin Metathesis Polymerization: Overview
2.0K
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...
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
2.0K
02:44Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
9.9K
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.
9.9K
02:13Reduction of Alkenes: Catalytic Hydrogenation
11.9K
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...
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...
11.9K
02:24Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
7.7K
Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
7.7K