Structural investigation of cobalt-doped silica derived from sol-gel synthesis

Vasconcelos, Daniela C.L., Nunes, Eduardo H.M., Houmard. Manuel, Motuzas, Julius, Nascimento, Jailton F., Grava, Wilson, Ciminelli, Virginia S.T., Diniz Da Costa, Joao C. and Vasconcelos, Wander L. (2013) Structural investigation of cobalt-doped silica derived from sol-gel synthesis. Journal of Non-Crystalline Solids, 378 1-6. doi:10.1016/j.jnoncrysol.2013.06.008

Author Vasconcelos, Daniela C.L.
Nunes, Eduardo H.M.
Houmard. Manuel
Motuzas, Julius
Nascimento, Jailton F.
Grava, Wilson
Ciminelli, Virginia S.T.
Diniz Da Costa, Joao C.
Vasconcelos, Wander L.
Title Structural investigation of cobalt-doped silica derived from sol-gel synthesis
Journal name Journal of Non-Crystalline Solids   Check publisher's open access policy
ISSN 0022-3093
Publication date 2013-01-01
Year available 2013
Sub-type Article (original research)
DOI 10.1016/j.jnoncrysol.2013.06.008
Volume 378
Start page 1
End page 6
Total pages 6
Place of publication Amsterdam, The Netherlands
Publisher Elsevier BV * North-Holland
Language eng
Subject 3104 Condensed Matter Physics
2503 Ceramics and Composites
2504 Electronic, Optical and Magnetic Materials
2505 Materials Chemistry
Abstract This work investigates the structural properties of cobalt doped silica samples prepared by sol-gel synthesis. Air calcination led to the formation of Co3O4 particles as evidenced by XRD and FTIR tests, although these features were no longer apparent for hydrogen-reduced samples. This behavior suggests the formation of metallic Co and CoO in the reduced samples. The variation of the cobalt content embedded in the silica matrix resulted in a change in texture of the prepared materials from microporous to mesoporous. This was attributed to the agglomeration of particles as observed in TEM micrographs, which led to larger particles and pores. The latter was associated with the formation of hysteresis loop in the nitrogen adsorption isotherms as a function of the [Co/(Si + Co)] molar ratio. This effect was more remarkable for reduced samples, leading to a further broadening of the hysteresis loop that stemmed from the reduction or loss of oxygen from cobalt oxide particles.
Keyword Cobalt doping
Hydrogen sorption
Micro and mesoporous
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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