Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/110589
Citations | ||
Scopus | Web of Science® | Altmetric |
---|---|---|
?
|
?
|
Type: | Journal article |
Title: | Dendritic porous yolk@ordered mesoporous shell structured heterogeneous nanocatalysts with enhanced stability |
Author: | Du, X. Zhao, C. Luan, Y. Zhang, C. Jaroniec, M. Huang, H. Zhang, X. Qiao, S. |
Citation: | Journal of Materials Chemistry A, 2017; 5(40):21560-21569 |
Publisher: | Royal Society of Chemistry |
Issue Date: | 2017 |
ISSN: | 2050-7488 2050-7496 |
Statement of Responsibility: | Xin Du, Caixia Zhao, Yi Luan, Changbin Zhang, Mietek Jaroniec, Hongwei Huang, Xueji Zhang and Shi-Zhang Qiao |
Abstract: | One of the major challenges in heterogeneous catalysis is how to suppress the aggregation of thermodynamically unstable noble metal nanoparticles (NPs) and simultaneously maintain their high accessibility. Here we report the fabrication of integrated functional nanostructures consisting of a dendritic porous silica yolk with many small noble metal NPs and a protective mesoporous silica shell (MSS) with perpendicularly aligned pore channels and tunable shell thickness by using a well-controlled interfacial engineering strategy. Three-dimensional (3D) dendrimer-like superstructures with many permeable center-radial large pore channels and a highly accessible internal surface area, named dendritic porous silica spheres (DPSSs), serve as unique yolks not only because of their capability to accommodate high density ultrafine Au or Pt NPs, but also their functionality to act as robust physical barriers to separate and confine the aforementioned loaded NPs, which result in slowing down their aggregation at high temperatures due to Ostwald ripening. These integrated hierarchical structures also ensure good stability under weak basic and acidic conditions. Due to their superior structural properties, the DPSSs@noble metal NPs@MSS yolk–shell structures exhibit excellent catalytic performance in p-nitrophenol reduction, epoxidation reaction and CO oxidation. The favorable stability and high catalytic performance of these yolk–shell structures make the developed design strategy very useful for the fabrication of novel highly active and stable catalysts. |
Rights: | This journal is © The Royal Society of Chemistry 2017 |
DOI: | 10.1039/c7ta07271f |
Grant ID: | http://purl.org/au-research/grants/arc/DP170104464 http://purl.org/au-research/grants/arc/DP140104062 http://purl.org/au-research/grants/arc/DP160104866 |
Published version: | http://dx.doi.org/10.1039/c7ta07271f |
Appears in Collections: | Aurora harvest 8 Chemical Engineering publications |
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.