Postsynthetic Functionalization of a Hollow Silica Nanoreactor with Manganese Oxide-Immobilized Metal Nanocrystals Inside the Cavity
Postsynthetic Functionalization of a Hollow Silica Nanoreactor with Manganese Oxide-Immobilized Metal Nanocrystals Inside the Cavity
复制标题
DOI：
10.1021/ja4083792
复制
发表时间：
2013-10-23
影响因子：
15
通讯作者：
Lee, In Su
中科院分区：
文献类型：
--
作者：
Kim, Soo Min;Jeon, Mina;Lee, In Su
基于空腔内 Mn3O4 表面的电取代反应，开发了一种用金属纳米晶体功能化预制中空纳米颗粒的后合成方案。所开发的方案产生了中空纳米反应器系统，其中一系列贵金属（例如 Pd、Pt、Rh 和 Ir 及其合金）的高密度超细催化纳米晶体分散固定在由选择性渗透二氧化硅壳包围的内表面上。所制备的中空纳米反应器在催化氢硅烷氧化方面表现出高度增强的活性、选择性和可回收性，这归因于多孔二氧化硅纳米壳和氧化物固定催化剂体系的协同组合。
A postsynthetic protocol of functionalizing the preformed hollow nanoparticles with metal nanocrystals was developed based on galvanic replacement reaction on the Mn3O4 surface inside the cavity. The developed protocol produced hollow nanoreactor systems, in which a high density of ultrafine catalytic nanocrystals of a range of noble metals, such as Pd, Pt, Rh, and Ir and their alloys, are dispersively immobilized on an interior surface enclosed by a selectively permeable silica shell. The fabricated hollow nanoreactor exhibited highly enhanced activity, selectivity, and recyclability in catalyzing the oxidation of hydrosilanes, which are attributable to the synergistic combination of the porous silica nanoshell and the oxide-immobilized catalyst system.