在Pt/MOOH中通过定制的Ni/Co比率和蚀刻切换化选择性
Qian Chang1,2,3, Yan Jiang1,2,3, Tao Sun1
1College of Chemical Engineering and Material Science, Tianjin University of Science and Technology, Tianjin 300457, P.R. China.
ACS applied materials & interfaces
|March 9, 2026
概括
在过渡金属氧化上使用的白金催化剂使甲可调化为甲醇或甲. 这一突破为选择性化学合成提供了一种多功能方法.
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
- 有机化学 有机化学
背景情况:
- 选择性化甲酸 (CAL) 具有挑战性,因为它具有结合的不和功能组.
- 开发高效的催化剂,对特定产品具有高选择性 (丁醇,COL,或丁甲,HCAL) 是至关重要的.
研究的目的:
- 探索支持过渡金属氧化 (Pt/MOOH,M=Ni,Co) 的纳米颗粒,并为可调节路径的CAL化设计了间层间距.
- 调查调整Ni/Co比率和使用蚀如何影响产品选择性.
主要方法:
- 合成Pt/MOOH催化剂,控制层间间距.
- 使用Pt/NiOOH和蚀Pt/CoOOH (Pt/CoOOH-E) 进行CAL的催化化.
- 通过气相色谱进行产品选择性分析.
- 在现场里叶变换红外光谱学 (FTIR) 和密度函数理论 (DFT) 计算以了解吸附机制.
主要成果:
- Pt/NiOOH实现了HCAL的94.1%的选择性.
- 刻的Pt/CoOOH (Pt/CoOOH-E) 将选择性转向了COL,其收益率为92.5%.
- 催化剂的选择性严重依赖于过渡金属的组成和支性质.
- DFT和现场FTIR揭示了与选择性相关的不同吸附模式 (η4 vs. η1(O)).
结论:
- 工程Pt/MOOH催化剂为CAL化提供可调节的选择性.
- 该方法为设计用于选择性化α,β不和化物的高效催化剂提供了一个范式.
- 对催化剂结构和组成的控制是指导反应通路的关键.
相关概念视频
02:13Reduction of Alkenes: Catalytic Hydrogenation
14.6K
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...
14.6K
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
4.0K
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...
4.0K
02:17Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule
18.0K
If a set of reactants can yield multiple constitutional isomers, but one of the isomers is obtained as the major product, the reaction is said to be regioselective. In such reactions, bond formation or breaking is favored at one reaction site over others.
The hydrohalogenation of an unsymmetrical alkene can yield two haloalkane products, depending on which vinylic carbon takes up the halogen. However, one product usually predominates, where hydrogen adds to the vinylic carbon bearing the...
The hydrohalogenation of an unsymmetrical alkene can yield two haloalkane products, depending on which vinylic carbon takes up the halogen. However, one product usually predominates, where hydrogen adds to the vinylic carbon bearing the...
18.0K
02:24Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
9.2K
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.
9.2K
02:44Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
13.2K
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.
13.2K
02:36Regioselectivity and Stereochemistry of Hydroboration
9.6K
A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn stereochemistry.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn stereochemistry.
9.6K