水素化反応のための選択性調節器としての金属有機フレームワーク
Meiting Zhao1, Kuo Yuan1,2, Yun Wang3
1Chinese Academy of Sciences (CAS) Key Laboratory of Nanosystem and Hierarchy Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China.
Nature
|October 6, 2016
まとめ
メタル・オーガニック・フレームワーク (MOF) は,不飽和アルデヒドを不飽和アルコールに選択的に水素化する. この新しいアプローチは,価値ある化学物質を効率的に生産するための触媒設計の課題を克服します.
科学分野:
- カタリシス
- 材料科学
- 有機化学
背景:
- 化学産業は,選択的水素化によるα,β-不飽和アルデヒドから供給される不飽和アルコールを必要とします.
- 伝統的な異質な触媒は,炭素-酸素結合よりも熱力学的に好ましい炭素-炭素結合の水素化により,選択性に苦戦する.
- 通常,金属酸化物の金属ナノ粒子は,熱力学的に不利な反応の選択性を高める能力を持っていません.
研究 の 目的:
- α,β 不飽和アルデヒドの水素化における選択性調節剤として金属有機フレームワーク (MOF) の使用を調査する.
- 高い選択性を持つ不飽和アルコールを生産するための安定で効率的な触媒を開発する.
- 選択的な異質な触媒のための新しい設計戦略を探求する.
主な方法:
- プラチナナノ粒子をFe3+またはCr3+金属ノードでMIL-101金属有機フレームワーク (MOF) に閉じ込める.
- 様々なα,β不飽和アルデヒドの水素化反応を,開発されたMOF包装の触媒を用いて行う.
- 選択性の強化のメカニズムを理解するために計算計算を使用します.
主要な成果:
- MOFで封じ込められたプラチナナノ粒子は,α,β不飽和アルデヒドの変換において高い効率性を示した.
- 従来の触媒と比較して,不飽和アルコールに対する有意な選択性が得られた.
- 計算により,MOFの金属部位は好ましく炭素-酸素グループと相互作用し,その水素化を好むことが確認された.
結論:
- メタル・オーガニック・フレームワークは,異質な触媒の選択性を効果的に制御できます.
- MOF内の金属ナノ粒子をサンドウィッチングすることは,先進的な触媒の開発に有望な戦略を提供します.
- このアプローチは価値ある不飽和アルコールの生産を容易にし,他の難しい化学的変換にも適用できます.
関連する概念動画
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
02:13Reduction of Alkenes: Catalytic Hydrogenation
14.7K
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...
14.7K
01:22Heterogeneous Catalysis
69
Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
69
01:23Properties of Organometallic Compounds
2.0K
Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
2.0K
02:17Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule
18.1K
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...
18.1K
01:25Radical Anti-Markovnikov Addition to Alkenes: Overview
4.3K
The addition of hydrogen bromide to alkenes in the presence of hydroperoxides or peroxides proceeds via an anti-Markovnikov pathway and yields alkyl bromides.
4.3K