e-journal

Metallic phases of cobalt-based catalysts in ethanol steam reforming: The effect of cerium oxide

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Abstract.
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 8C, 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 8C) 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 CeO2 promoter (10 wt.%) stabilizes the hcp cobalt
structure at reforming temperatures up to 600 8C. Moreover, during the pre-reduction process, CeO2
promoter prevents sintering during the transformation of Co3O4 to hcp cobalt. Both reforming
experiments and in situ diffuse-reflectance infrared Fourier transform spectroscopy (DRIFTS) showed
that the surface reactions were modified by CeO2 promoter on 10% Ce–Co (hcp) to give a lower CO
selectivity and a higher H2 yield as compared with the unpromoted hcp Co.

Keywords: Ethanol steam reforming, Hydrogen production, Metallic cobalt, CeO2 promoter, In situ X-ray, diffractometry (XRD), In situ diffuse-reflectance infrared Fourier, transform spectroscopy (DRIFTS).

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Informasi Detail

Judul Seri

Applied Catalysis A: General

No. Panggil

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Penerbit

London : Elsevier B.V.., 2009

Deskripsi Fisik

Applied Catalysis A: General 355 (2009) 69–77

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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