过渡金属单个原子的高负载在化物催化剂上
Jianwei Zheng1, Konstantin Lebedev1, Simson Wu1
1Wolfson Catalysis Centre, Department of Chemistry, University of Oxford, Oxford OX1 3QR, U.K.
Journal of the American Chemical Society
|May 21, 2021
概括
过渡金属添加的化物为能源应用提供独特的催化性能. 一种新的沉积方法在二维化物上实现了高稳定的单原子分散,提高了CO2化效率.
科学领域:
- 材料科学
- 催化剂
- 纳米技术
背景情况:
- 过渡金属添加的化物是石油化学和能源转换的关键催化剂.
- 对于最大限度地利用原子在催化过程中,金属在 chalcogenide 表面的均分散至关重要.
- 现有方法在实现高金属负载与均分散方面面临挑战.
研究的目的:
- 开发和研究一种沉积方法,用于在二维石化物上制备单个过渡金属原子.
- 探索这些单原子催化剂在二氧化碳化中的催化性能.
- 了解单个金属原子与石化基体之间的相互作用.
主要方法:
- 使用一种涉及氨酸协调过渡金属复合物的沉积方法.
- 在二维石化物 (MoS2,MoSe2,WS2,WSe2) 上制备了各种过渡金属 (Fe,Co,Ni,Cu,Pt,Pd,Ru) 的单个原子.
- 采用先进的特征分析技术来分析金属分散和与支物的相互作用.
主要成果:
- 在单个过渡金属原子的均分散下,达到高金属负荷 (高达10%).
- 观察到单个原子和表面离子/空隙之间的强相互作用,防止聚合.
- 与Fe集群相比,在CO2化中对MoS2原子分散的Fe表现出更高的内在活性和稳定性.
结论:
- 开发的沉积方法可以在二维石化物上制备高度分散的单个过渡金属原子催化剂.
- 原子Fe在MoS2上表现出增强的二氧化碳化催化性能,突出显示了单原子分散的好处.
- 这种方法为设计与能源相关的化学转换的先进催化剂提供了有希望的途径.
更多相关视频
10:42Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
Published on: December 29, 2016
10.9K
04:09Demonstrating the Simplicity and In Situ Temperature Monitoring of the Mechanochemical Synthesis of Metal Chalcogenides Suitable for Thermoelectrics
Published on: August 30, 2024
565
相关概念视频
02:58Properties of Transition Metals
28.1K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
28.1K
02:51Metal-Ligand Bonds
22.6K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
22.6K
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.6K
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...
3.6K
02:58Crystal Field Theory - Octahedral Complexes
28.6K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
28.6K
01:19Complexation Equilibria: The Chelate Effect
805
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
805
01:09Complexation Equilibria: Factors Influencing Stability of Complexes
578
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
578