Synthesis of supported nickel nanoparticles via a nonthermal plasma approach and its application in CO2 reforming of methane

Odedairo, Taiwo, Chen, Jiuling and Zhu, Zhonghua (2013) Synthesis of supported nickel nanoparticles via a nonthermal plasma approach and its application in CO2 reforming of methane. Journal of Physical Chemistry C, 117 41: 21288-21302. doi:10.1021/jp405009v


Author Odedairo, Taiwo
Chen, Jiuling
Zhu, Zhonghua
Title Synthesis of supported nickel nanoparticles via a nonthermal plasma approach and its application in CO2 reforming of methane
Formatted title
Synthesis of supported nickel nanoparticles via a nonthermal plasma approach and its application in CO2 reforming of methane
Journal name Journal of Physical Chemistry C   Check publisher's open access policy
ISSN 1932-7447
1932-7455
Publication date 2013-10-17
Year available 2013
Sub-type Article (original research)
DOI 10.1021/jp405009v
Volume 117
Issue 41
Start page 21288
End page 21302
Total pages 15
Place of publication Washington, DC, United States
Publisher American Chemical Society
Language eng
Formatted abstract
A microwave plasma treatment was applied to obtain not only a desired strong metal−support interaction but also well-dispersed nickel nanoparticles supported on ceria. The catalytic properties of these supported nanoparticles were tested in CO2 reforming of methane. The plasma-treated Ni/CeO2 catalysts showed enhanced turnover frequencies (TOFs), normalized by Ni on the surface, as compared with the thermally calcined samples. The Ni/CeO2 treated under plasma with low Ni loading gave an enhanced TOF of 9.5 s−1 (700 °C, 50% CH4 and 50% CO2, and 1 atm) as compared with the thermally calcined catalyst (8.7 s−1). Increasing the Ni loading on the plasma-treated Ni/CeO2 catalysts gave an improved TOF (10.4 s−1) which was stable with time, while the TOF was observed to drop by a factor of 2 relative to the optimal TOF on the thermally calcined catalyst after 5 h. For the plasma-treated samples, concurrent treatment of both the uncalcined ceria support and the loaded metal precursor generated strong metal−support interaction and formation of well-dispersed Ni particles, resulting in a superior and stable TOF with time. In the case of thermally calcined catalysts, the weak metal−support interaction and the agglomeration of Ni clusters together with the migration of the Ni particles into the ceria support hindered the accessibility of active nickel sites, resulting in deactivation of the materials during reaction. Moreover, high-resolution transmission electron microscopy, high-angle annular dark-field scanning transmission electron microscopy, H2 temperature-programmed reduction, and X-ray photoelectron spectroscopy yielded a clear picture of the impact of microwave plasma treatment on the nickel particle size, shape, distribution, and interaction with the ceria support.
Keyword Carbon dioxide
Bimetallic catalysts
Ni/sio2 catalyst
Particle size
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2014 Collection
 
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