Indexed by:
期刊论文
First Author:
Qi, Xinhong
Correspondence Author:
Li, XC (reprint author), Dalian Univ Technol, Dept Chem Engn, State Key Lab Fine Chem, Linggong Rd 2, Dalian 116024, Peoples R China.
Co-author:
Li, Xiangcun,He, Gaohong,Zhu, Yangzhi,Diao, Yurong,Lu, Huilan
Date of Publication:
2016-01-15
Journal:
CHEMICAL ENGINEERING JOURNAL
Included Journals:
SCIE、EI
Document Type:
J
Volume:
284
Issue:
284
Page Number:
351-356
ISSN No.:
1385-8947
Key Words:
Noble metal nanocrystals; Hollow silica submicrospheres; Mesopore;
Catalyst
Abstract:
Noble metal nanocrystals (Au, Pt or AuPt) with controlled compositions and nanostructures were embedded into hollow silica submicrospheres with highly ordered radial mesopores through a one-step sol-gel process. 2,4-Dihydroxybenzoic acid-formaldehyde (RF-COOH) resin submicrospheres were utilized simultaneously as a hard template to create hollow interiors inside the silica submicrospheres and as carriers to transport pregrown metal nanocrystals, including Au nanoparticle (NP), Pt NP, and AuPt nanoalloy, into the submicrospheres. Calcination removes the resin submicrospheres and causes metal nanocrystals embedded into the RF-COOH submicrospheres break into multiple smaller nanoparticles (2-6 nm) that are randomly dispersed in the hollow space of SiO2 submicrospheres M@SiO2 (M = Au, Pt or AuPt). The AuPt@SiO2 submicrospheres showed good catalytic performance for epoxidation of styrene with the conversion and selectivity of 74% and 85%, respectively. The approach reported in this study could potentially be used to simplify the fabrication process of noble metal nanoalloys, which usually entails multiple steps and a previously synthesized hard metal template, and thus guide the design and creation of high-performance catalysts. (C) 2015 Elsevier B.V. All rights reserved.
Translation or Not:
no
