Yolk-Shell Hybrid Materials with a Periodic Mesoporous Organosilica Shell: Ideal Nanoreactors for Selective Alcohol Oxidation
Yolk-Shell Hybrid Materials with a Periodic Mesoporous Organosilica Shell: Ideal Nanoreactors for Selective Alcohol Oxidation
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DOI：
10.1002/adfm.201101900
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发表时间：
2012-02-08
影响因子：
19
通讯作者：
Qiao, Shi Zhang
中科院分区：
文献类型：
--
作者：
Liu, Jian;Yang, Heng Quan;Qiao, Shi Zhang
这一贡献描述了多功能yolkshell纳米粒子（YSNs）的制备由二氧化硅球的核心和基于具有垂直排列的介孔通道的周期性介孔有机硅（PMO）的外壳组成。通过双中间相和囊泡软模板法合成了新的蛋黄壳杂交材料。壳的介观结构、中空空间的尺寸（4-52 nm）和壳厚度（16-34 nm）可以通过精确调节合成参数来调节，如通过X射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）和氮吸附研究所证明的。各种金属纳米颗粒（例如，Au、Pt和Pd）通过浸渍和还原足够的金属前体被封装并限制在核和壳之间的空隙空间中。然后进行各种醇底物的选择性氧化，以说明这种结构在催化中的益处。高的转化率（类似于100%）和优异的选择性（类似于99%），获得超过Pd纳米粒子封装在混合PMO蛋黄壳结构。
This contribution describes the preparation of multifunctional yolkshell nanoparticles (YSNs) consisting of a core of silica spheres and an outer shell based on periodic mesoporous organosilica (PMO) with perpendicularly aligned mesoporous channels. The new yolkshell hybrid materials were synthesised through a dual mesophase and vesicle soft templating method. The mesostructure of the shell, the dimension of the hollow space (4-52 nm), and the shell thickness (16-34 nm) could be adjusted by precise tuning of the synthesis parameters, as evidenced by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and nitrogen sorption investigations. Various metal nanoparticles (e.g., Au, Pt, and Pd) were encapsulated and confined in the void space between the core and the shell using impregnation and reduction of adequate metal precursors. The selective oxidation of various alcohol substrates was then carried out to illustrate the benefits of such an architecture in catalysis. High conversion (similar to 100%) and excellent selectivity (similar to 99%) were obtained over Pd nanoparticles encapsulated in the hybrid PMO yolkshell structures.