Abstract
The non-oxidative thermo catalytic decomposition of methane into COx-free hydrogen and nanocarbon has attracted recent research interest, due to the concern of zero emission of greenhouse gases and the bulk production of value added carbon nanomaterials. In this work, Nickel, Cobalt and Iron based monometallic catalysts supported over sol gel derived silica microflakes were synthesized via a facile wet impregnation route and were successfully used for the direct thermal decomposition of methane into COx free hydrogen and nanocarbon. The active phase of the fresh catalysts was found to be NiO, Co3O4 and Fe2O3. The field emission scanning electron microscopy images clearly indicated the fine dispersion of various agglomerated metal oxide nanostructures on the surface of the sol gel derived silica microflakes. A maximum hydrogen yield of 74% was obtained for the Ni based catalyst, with a slight deactivation with time on stream. The Co and Fe based monometallic catalysts were found to be less active but more stable than the Ni catalyst. Different types of carbon nanomaterials were observed on the surface of the catalysts after methane decomposition. Multi-walled carbon nanotubes, carbon particles with a fruit like morphology and multilayer graphene sheets were obtained over the Ni, Co and Fe catalysts respectively. The Raman and thermo-gravimetric analyses indicated their higher graphitization degree, crystallinity and oxidation stability.
| Original language | English |
|---|---|
| Pages (from-to) | 1009-1021 |
| Number of pages | 13 |
| Journal | Chemical Engineering Journal |
| Volume | 262 |
| DOIs | |
| Publication status | Published - 5 Feb 2015 |
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Keywords
- Carbon nanotubes
- Hydrogen
- Methane decomposition
- Monometallic catalysts
- Multilayer graphene sheets
- Silica microflakes
ASJC Scopus subject areas
- Chemical Engineering(all)
- Chemistry(all)
- Industrial and Manufacturing Engineering
- Environmental Chemistry
Cite this
Methane decomposition over Ni, Co and Fe based monometallic catalysts supported on sol gel derived SiO2 microflakes. / Pudukudy, Manoj; Yaakob, Zahira.
In: Chemical Engineering Journal, Vol. 262, 05.02.2015, p. 1009-1021.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Methane decomposition over Ni, Co and Fe based monometallic catalysts supported on sol gel derived SiO2 microflakes
AU - Pudukudy, Manoj
AU - Yaakob, Zahira
PY - 2015/2/5
Y1 - 2015/2/5
N2 - The non-oxidative thermo catalytic decomposition of methane into COx-free hydrogen and nanocarbon has attracted recent research interest, due to the concern of zero emission of greenhouse gases and the bulk production of value added carbon nanomaterials. In this work, Nickel, Cobalt and Iron based monometallic catalysts supported over sol gel derived silica microflakes were synthesized via a facile wet impregnation route and were successfully used for the direct thermal decomposition of methane into COx free hydrogen and nanocarbon. The active phase of the fresh catalysts was found to be NiO, Co3O4 and Fe2O3. The field emission scanning electron microscopy images clearly indicated the fine dispersion of various agglomerated metal oxide nanostructures on the surface of the sol gel derived silica microflakes. A maximum hydrogen yield of 74% was obtained for the Ni based catalyst, with a slight deactivation with time on stream. The Co and Fe based monometallic catalysts were found to be less active but more stable than the Ni catalyst. Different types of carbon nanomaterials were observed on the surface of the catalysts after methane decomposition. Multi-walled carbon nanotubes, carbon particles with a fruit like morphology and multilayer graphene sheets were obtained over the Ni, Co and Fe catalysts respectively. The Raman and thermo-gravimetric analyses indicated their higher graphitization degree, crystallinity and oxidation stability.
AB - The non-oxidative thermo catalytic decomposition of methane into COx-free hydrogen and nanocarbon has attracted recent research interest, due to the concern of zero emission of greenhouse gases and the bulk production of value added carbon nanomaterials. In this work, Nickel, Cobalt and Iron based monometallic catalysts supported over sol gel derived silica microflakes were synthesized via a facile wet impregnation route and were successfully used for the direct thermal decomposition of methane into COx free hydrogen and nanocarbon. The active phase of the fresh catalysts was found to be NiO, Co3O4 and Fe2O3. The field emission scanning electron microscopy images clearly indicated the fine dispersion of various agglomerated metal oxide nanostructures on the surface of the sol gel derived silica microflakes. A maximum hydrogen yield of 74% was obtained for the Ni based catalyst, with a slight deactivation with time on stream. The Co and Fe based monometallic catalysts were found to be less active but more stable than the Ni catalyst. Different types of carbon nanomaterials were observed on the surface of the catalysts after methane decomposition. Multi-walled carbon nanotubes, carbon particles with a fruit like morphology and multilayer graphene sheets were obtained over the Ni, Co and Fe catalysts respectively. The Raman and thermo-gravimetric analyses indicated their higher graphitization degree, crystallinity and oxidation stability.
KW - Carbon nanotubes
KW - Hydrogen
KW - Methane decomposition
KW - Monometallic catalysts
KW - Multilayer graphene sheets
KW - Silica microflakes
UR - http://www.scopus.com/inward/record.url?scp=84910020001&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84910020001&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2014.10.077
DO - 10.1016/j.cej.2014.10.077
M3 - Article
AN - SCOPUS:84910020001
VL - 262
SP - 1009
EP - 1021
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
SN - 1385-8947
ER -