Journal article
Metallic phases of cobalt-based catalysts in ethanol steam reforming: The effect of cerium oxide
Applied catalysis. A, General, Vol.355(1), pp.69-77
2009
Handle:
https://hdl.handle.net/2376/113035
Abstract
The catalytic activity of cobalt to produce hydrogen via ethanol steam reforming has been investigated in relating to the crystalline structure of metallic cobalt. According to this figure, at reaction temperature of 350
°C, cobalt in hexagonal close-packed (hcp) structure possesses higher conversion and hydrogen production rate as compared with cobalt in face-centered cubic (fcc) structure (O/C
=
6.5 and WHSV
=
0.8
h
−1).
The catalytic activity of cobalt in the production of hydrogen via ethanol steam reforming has been investigated in its relation to the crystalline structure of metallic cobalt. At a reaction temperature of 350
°C, the specific hydrogen production rates show that hexagonal close-packed (hcp) cobalt possesses higher activity than face-centered cubic (fcc) cobalt. However, at typical reaction temperatures (400–500
°C) for ethanol steam reforming, hcp cobalt is transformed to less active fcc cobalt, as confirmed by
in situ X-ray diffractometry (XRD). The addition of CeO
2 promoter (10
wt.%) stabilizes the hcp cobalt structure at reforming temperatures up to 600
°C. Moreover, during the pre-reduction process, CeO
2 promoter prevents sintering during the transformation of Co
3O
4 to hcp cobalt. Both reforming experiments and
in situ diffuse-reflectance infrared Fourier transform spectroscopy (DRIFTS) showed that the surface reactions were modified by CeO
2 promoter on 10% Ce–Co (hcp) to give a lower CO selectivity and a higher H
2 yield as compared with the unpromoted hcp Co.
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Details
- Title
- Metallic phases of cobalt-based catalysts in ethanol steam reforming: The effect of cerium oxide
- Creators
- Sean S.-Y Lin - The Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, P.O. Box 642710, Pullman, WA 99164-2710, USADo Heui Kim - Institute for Interfacial Catalysis, Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA 99354, USASu Y Ha - The Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, P.O. Box 642710, Pullman, WA 99164-2710, USA
- Publication Details
- Applied catalysis. A, General, Vol.355(1), pp.69-77
- Academic Unit
- Chemical Engineering and Bioengineering, School of
- Publisher
- Elsevier B.V
- Identifiers
- 99900547736701842
- Language
- English
- Resource Type
- Journal article