Fang Ruiqi, Tian Panliang, Yang Xianfeng, Luque Rafael, Li Yingwei
State Key Laboratory of Pulp and Paper Engineering , School of Chemistry and Chemical Engineering , South China University of Technology , Guangzhou 510640 , China . Email:
Analytical and Testing Centre , South China University of Technology , Guangzhou 510640 , China.
Chem Sci. 2018 Jan 4;9(7):1854-1859. doi: 10.1039/c7sc04724j. eCollection 2018 Feb 21.
The development of efficient encapsulation strategies has attracted intense interest for preparing highly active and stable heterogeneous metal catalysts. However, issues related to low loadings, costly precursors and complex synthesis processes restrict their potential applications. Herein, we report a novel and general strategy to encapsulate various ultrafine metal-oxides nanoparticles (NPs) into the mesoporous KIT-6. The synthesis is facile, which only involves self-assembly of a metal-organic framework (MOF) precursor in the silica mesopores and a subsequent calcination process to transform the MOF into metal-oxide NPs. After the controlled calcination, the metal-oxide NPs produced from MOF decomposition are exclusively confined and uniformly distributed in the mesopores of KIT-6 with high metal loadings. Benefitting from the encapsulation effects, as-synthesized Co@KIT-6 materials exhibit superior catalytic activity and recycling stability in biomass-derived HMF oxidation under mild reaction conditions.
高效封装策略的发展引起了人们对制备高活性和稳定的多相金属催化剂的浓厚兴趣。然而，与低负载量、昂贵的前驱体和复杂的合成过程相关的问题限制了它们的潜在应用。在此，我们报道了一种新颖且通用的策略，即将各种超细金属氧化物纳米颗粒（NPs）封装到介孔KIT-6中。合成过程简便，仅涉及金属有机框架（MOF）前驱体在二氧化硅介孔中的自组装以及随后的煅烧过程，以将MOF转化为金属氧化物NPs。经过可控煅烧后，由MOF分解产生的金属氧化物NPs被专门限制并均匀分布在KIT-6的介孔中，具有高金属负载量。受益于封装效果，合成的Co@KIT-6材料在温和反应条件下的生物质衍生HMF氧化中表现出优异的催化活性和循环稳定性。
