e-journal

Methane decomposition over Ni–MgO–Al2O3 catalysts

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Abstract.
Studies of methane decomposition were performed over nickel alumina catalysts modified with
magnesia. The catalysts were obtained by the co-precipitation method. The properties of catalysts were
investigated by the temperature programmed reduction (TPR) and hydrogen desorption (TPD) methods.
Methane decomposition was studied by the thermogravimetric and transient temperature programmed
reaction methods. The nature of carbon deposits formed under different reaction conditions was
investigated by the temperature programmed oxidation method (TPO) and high resolution transmission
electron microscopy (HRTEM). An introduction of magnesium to the preparation mixture of catalysts led
to the formation of smaller nickel crystallites with stronger adsorption sites. It was found out that the
activity of catalysts and the properties of carbon deposits were related to the catalysts composition and
the reaction temperature. Carbon filaments with fishbone-like packed graphitic layers were formed at
500 C, while the multi-walled nanotubes were observed after reaction performed at 700 C. The
increase of magnesium content led to the increase of the rate of methane decomposition at the initial
stages of the reaction. Deactivation of the catalysts was related to the insufficient removal of carbon
species from the surface of nickel crystallites and the formation of stable, graphitic carbon deposits
covering the surface of metal.

Keywords: Hydrogen, Carbon nanomaterials, Nickel catalyst, Deactivation, HRTEM

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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 357 (2009) 236–243

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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