相关实验视频
Updated: Jul 22, 2025
11:15
HKUST-1 as a Heterogeneous Catalyst for the Synthesis of Vanillin
Published on: July 23, 2016
10.3K
协调缺陷引起的丧的易斯对在基于聚氧金属酸盐的金属有机框架中,用于高效的催化化
Yan Liang1, Zhong Zhang1, Xiaofang Su2
1School of Chemistry, Dalian University of Technology, Dalian, 116024, China.
Angewandte Chemie (International ed. in English)
|July 24, 2023
概括
研究人员开发了一种新的固体丧易斯对 (FLP) 催化剂,使用基于聚氧甲酸盐的金属有机框架. 这种催化剂有效地激活H2用于化反应,为设计先进的催化材料提供了一条新的途径.
科学领域:
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
- 纳米技术纳米技术
背景情况:
- 设计具有精确控制的易斯酸 (LA) 和易斯基 (LB) 位点的高效固体催化剂对于工业应用至关重要,但仍然是一个重大挑战.
- 丧的易斯对 (FLP) 以其激活像H2这样的小分子的能力而闻名,但它们在强大的多孔系统中的实施需要仔细的结构工程.
研究的目的:
- 在基于聚氧甲酸盐 (POM) 的金属有机框架 (MOF) 中构建一个高效的固体挫败易斯对 (FLP) 催化剂.
- 精确控制LA和LB站点之间的空间距离,以实现最佳的H2激活和化催化.
主要方法:
- 基于POM的MOF的制造,具有协调缺陷金属节点作为LA站点和表面基础POM作为LB站点.
- 描述MOF结构以确定LA和LB站点之间的空间布局和距离 (~4.3 Å).
- 在化反应中评估构造的FLP催化剂的催化活性.
主要成果:
- 有缺陷的基于POM的MOF成功创建了FLP站点,具有最佳的LA-LB距离,用于H2激活.
- FLP催化剂在异质解离 H2 转化为活性 Hδ− 物种方面表现出高活性.
- 化活性显著增强,比无缺陷POM-MOF高55倍,比没有缺陷POM的缺陷MOF高2.7倍.
结论:
- 使用缺陷的基于POM的MOFs开发了一种用于精确设计多站点催化剂的新策略.
- 工程FLP催化剂在化中表现出卓越的性能,展示了协同催化学的潜力.
- 这项工作为创建用于特定基质激活和化学转换的先进催化材料开辟了新的途径.
相关概念视频
02:51Metal-Ligand Bonds
21.0K
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...
21.0K
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.4K
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...
3.4K
02:42Valence Bond Theory
8.8K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
8.8K
02:44Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
10.4K
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.
10.4K
02:57Coordination Number and Geometry
16.1K
For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
16.1K
02:13Reduction of Alkenes: Catalytic Hydrogenation
12.2K
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...
12.2K