基于微孔金属有机框架和多氧金属酸盐的高度稳定的晶体催化剂
Chun-Yan Sun1, Shu-Xia Liu, Da-Dong Liang
1Key Laboratory of Polyoxometalate Science of Ministry of Education, College of Chemistry, Northeast Normal University, Changchun, Jilin 130024, China.
Journal of the American Chemical Society
|January 17, 2009
概括
研究人员开发了新型的金属有机框架 (MOF) 材料,其中包括Keggin多氧金属酸盐 (POMs),用于异质酸催化. 这些稳定,可重复使用的MOF-POM化合物在水解中表现出高活性和选择性.
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:
- 金属有机框架 (MOF) 为各种应用提供可调节的多孔结构.
- 聚氧甲酸盐 (POMs) 是具有催化潜力的多功能阴离子集群.
- 将POM集成到MOF中可以提高催化性能和稳定性.
研究的目的:
- 合成和描述结合Cu-BTC MOF与Keggin POMs的新型晶体化合物.
- 评估这些MOF-POM混合材料的稳定性和酸催化性能.
- 为了证明MOF支持的POMs作为高效的异质酸催化剂的潜力.
主要方法:
- 使用铜酸盐,BTC和Keggin POMs的一步热水合成MOF-POM化合物.
- 使用X射线晶体学,热重力测量分析 (TG),FT-IR,UV视光谱学和N(2) 吸附的表征.
- 通过水解评估催化性能,包括可重复使用性和选择性研究.
主要成果:
- 成功合成了新的晶体MOF-POM化合物.
- 这些材料具有很高的热和酸稳定性,没有POM漏或框架分解.
- 代表性MOF-PW(12) 化合物在水解中表现出高活性,选择性和可重复使用性.
- 发现催化选择性取决于基质大小和孔隙可访问性.
结论:
- 合成的MOF-POM化合物代表了一类新的稳定,异构的酸催化剂.
- MOF宿主矩阵有效分散POM,防止聚合和停用,从而增强催化性能.
- 这项工作建立了第一个明确的例子,晶体MOF支持的POM作为真正的异质酸催化剂.
相关概念视频
01:23Properties of Organometallic Compounds
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.
01:22Heterogeneous Catalysis
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...
01:09Complexation Equilibria: Factors Influencing Stability of Complexes
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...