Preparation of hollow submicrospheres with ordered porous SiO2 shell and multiple AuPt nanoalloy cores and their high catalytic activity
发表时间：2019-03-13
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- 论文类型：
- 期刊论文
- 第一作者：
- Qi, Xinhong
- 通讯作者：
- Li, XC (reprint author), Dalian Univ Technol, Dept Chem Engn, State Key Lab Fine Chem, Linggong Rd 2, Dalian 116024, Peoples R China.
- 合写作者：
- Li, Xiangcun,He, Gaohong,Zhu, Yangzhi,Diao, Yurong,Lu, Huilan
- 发表时间：
- 2016-01-15
- 发表刊物：
- CHEMICAL ENGINEERING JOURNAL
- 收录刊物：
- SCIE、EI
- 文献类型：
- J
- 卷号：
- 284
- 期号：
- 284
- 页面范围：
- 351-356
- ISSN号：
- 1385-8947
- 关键字：
- Noble metal nanocrystals; Hollow silica submicrospheres; Mesopore; Catalyst
- 摘要：
- 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.
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- 否
