Synthesis and characterization of sintering-resistant silica-encapsulated Fe3O4 magnetic nanoparticles active for oxidation and chemical looping combustion

Park, Jung-Nam, Zhang, Peng, Hu, Yong-Sheng and McFarland, Eric W (2010) Synthesis and characterization of sintering-resistant silica-encapsulated Fe3O4 magnetic nanoparticles active for oxidation and chemical looping combustion. Nanotechnology, 21 22: 225708.1-225708.8. doi:10.1088/0957-4484/21/22/225708


Author Park, Jung-Nam
Zhang, Peng
Hu, Yong-Sheng
McFarland, Eric W
Title Synthesis and characterization of sintering-resistant silica-encapsulated Fe3O4 magnetic nanoparticles active for oxidation and chemical looping combustion
Journal name Nanotechnology   Check publisher's open access policy
ISSN 0957-4484
1361-6528
Publication date 2010-01-01
Sub-type Article (original research)
DOI 10.1088/0957-4484/21/22/225708
Open Access Status Not Open Access
Volume 21
Issue 22
Start page 225708.1
End page 225708.8
Total pages 8
Place of publication Bristol, United Kingdom
Publisher Institute of Physics Publishing
Language eng
Abstract A nanocomposite catalyst composed of ferromagnetic magnetite cores (15.5 2.0nm) and silica shells with a thickness of 4.5 1.0nm (Fe3O 4@SiO2) was prepared by a two-step microemulsion-based synthesis. X-ray photoelectron spectroscopy and Raman spectroscopy after oxidation support the presence of a stable Fe3O4 core and a surface phase of γ-Fe2O3. The nanocomposite structure exhibited 100% conversion of CO in oxygen at a residence time of 0.1s at 310 °C. When pre-oxidized, the Fe3O4@SiO 2 catalyst is shown to be a suitable solid oxygen carrier for chemical looping combustion of methane at 700 °C. The nanocomposites retain their magnetism following the reaction which provides the potential for use of magnetic separation and capture in moving bed reactor applications. The core magnetite within the silica shell is resistant to sintering and a bulk phase transition to temperatures as high as 700 °C. These catalysts can be of use in applications of high temperature applications where catalyst recovery by magnetic separation may be required.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Chemical Engineering Publications
 
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