水滑石
催化作用
双功能
氧化还原
层状双氢氧化物
无机化学
化学
有机反应
基础(拓扑)
沸石
选择性
金属有机骨架
化学工程
吸附
材料科学
离子交换
有机化学
离子
工程类
数学分析
数学
作者
Bert F. Sels,Dirk De Vos,Pierre Jacobs
摘要
Abstract Hydrotalcite-like anionic clays (HTs; or layered double hydroxides, LDHs) can be used as precursors to mixed oxides, but their catalytic potential reaches much further. This review demonstrates that HTs can be successfully applied in a broad spectrum of organic reactions, with advantages such as improved activity, selectivity, metal dispersion, less waste production, and an improved recuperation of immobilized catalysts. HTs can be used in the as-synthesized form or after different pretreatments. The HT as such is a solid base or, depending on the elemental composition of its octahedral layers, may have redox properties. Specific metals can be incorporated either as a cation in the octahedral layer or as an anion via exchange. The anion-exchange strategy is especially successful in the context of heterogenizing homogeneous catalysts. A particular advantage for base catalysis is that the number and strength of the basic sites can be tuned precisely to a specific reaction. HTs are excellent materials to design bifunctional redox-base catalysts or to control the acid–base properties around a heterogenized metal complex. Potential applications of HTs range from the production of large-scale basic chemicals to the synthesis of small-scale specialty chemicals. Keywords: Hydrotalcite-like anionic claysLayered double hydroxidesCatalysis of organic reactions Acknowledgment This work was sponsored by the Belgian Federal Government in the frame of an IUAP project “Supramolecular Chemistry and Catalysis” and to FWO for a grant. B.F.S. is a fellow of IWT (Belgium).
科研通智能强力驱动
Strongly Powered by AbleSci AI