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Production of hydrogen by ethanol steam reforming over catalysts from reverse microemulsion-derived nanocompounds

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Abstract.
In the present work, hydrotalcite-like compound precursor for preparing mixed oxide catalyst
was successfully synthesized by a novel method, which was a combination of the reverse
microemulsion and coprecipitationmethods. It was observed that the precursor obtained from
the above method possessed superior characteristics for preparing mixed oxide catalyst used
in ethanol steam reforming (ESR). Furthermore, for comparison, catalysts prepared from
conventional coprecipitation and impregnation methods had been characterized together
with the catalyst prepared from the new method. Besides ICP, BET, X-ray diffraction (XRD),
temperature-programmed reduction (TPR), H2-TPD, TG, and TEM analytic techniques, catalytic
performance for ESR was also investigated. The results of XRD and TPR indicated that a solid
solution phase existed in the catalysts obtained from reverse microemulsion and coprecipitation
methods, while spinel phase together with solid solution were observed in the catalyst
obtained from the impregnation method. The high BET surface area of the catalyst obtained
from the reverse microemulsion method enhanced the dispersion and the surface area of
nickel, which improved the catalyst performance. From TEM images, the aggregated Ni could
be found in the catalyst obtained from the impregnation method, while the hydrotalcite-like
compound precursors prepared from reverse microemulsion and coprecipitation methods
produced homogeneously distributed active Ni metal species. The catalyst obtained from
reverse microemulsion exhibited the best activity, stability, and least carbon deposition
because of the formation of hydrotalcite-like compound precursor, uniform dispersion of
active Ni metal species, and much more surface area supporting the active Ni metal sites.

Keywords:
Ethanol
Steam reforming
Nickel catalyst
Hydrogen production

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Informasi Detail

Judul Seri

INTERNATI ONAL JOURNAL OF HYDROGEN ENERGY

No. Panggil

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Penerbit

London : International Association for Hydrogen Energy. Published by Elsevier Ltd.., 2008

Deskripsi Fisik

INTERNATI ONAL JOURNAL OF HYDROGEN ENERGY 33 ( 2008 ) 3736 – 3747

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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