蛋黄壳结构介孔硅纳米球的结构在催化应用中的研究。

Architecture of yolk-shell structured mesoporous silica nanospheres for catalytic applications.

机构信息

State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, China.

出版信息

Dalton Trans. 2018 Jul 10;47(27):9072-9078. doi: 10.1039/c8dt02254b.

DOI:10.1039/c8dt02254b

PMID:29932204

Abstract

We report the design and realization of yolk-shell structured nanospheres with periodic mesoporous organosilica (PMO) nanospheres or noble metal nanoparticles encapsulated in mesoporous silica shells via a selective etching method. These architectures have well controlled structure, size and morphology. The yolk-shell structured PMO@SiO2 nanoparticles can be precisely functionalized with different catalytic functionalities, even incompatible acidic and basic groups: the PMO core with amino (-NH2) groups and the mesoporous silica shell with sulfonic acid (-SO3H) groups. As a nanoreactor, the as-synthesized Au@SiO2 nanospheres show faster reduction of 4-nitrophenol than that of nitrobenzene. Furthermore, the prepared PMO-NH2@SiO2-SO3H nanoparticles can be used as bifunctional catalysts with highly efficient catalytic performance for catalyzing the deacetalization-Henry cascade reaction.

摘要

我们报告了蛋黄壳结构纳米球的设计和实现，这些纳米球通过选择性蚀刻方法封装了周期性介孔有机硅（PMO）纳米球或贵金属纳米颗粒。这些结构具有良好的控制结构、尺寸和形态。蛋黄壳结构的 PMO@SiO2 纳米颗粒可以精确地功能化具有不同的催化功能，甚至是不相容的酸性和碱性基团：PMO 核带有氨基（-NH2）基团，介孔硅壳带有磺酸基（-SO3H）基团。作为纳米反应器，所合成的 Au@SiO2 纳米球在还原 4-硝基苯酚方面比硝基苯更快。此外，制备的 PMO-NH2@SiO2-SO3H 纳米颗粒可用作双功能催化剂，具有高效的催化性能，可催化去乙酰化-亨利串联反应。