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Preparation of “intelligent” Pt/Ni/Mg(Al)O catalysts starting from commercial Mg–Al LDHs for daily start-up and shut-down steam reforming of methane

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Abstract.
Ni/[MgxAl]O (x=3.5, 1.5 and 0.5) doped with trace amounts of Pt were prepared from Mg–Al layered double
hydroxides (LDHs) aiming the “green” preparations of “intelligent” reforming catalysts. Commercial Mg–Al
LDHs were used as raw materials. The LDHs were calcined and impregnated with Ni(II) and Pt(IV) nitrates at
room temperature. The preparative conditions were optimized to produce an effective catalyst for the daily
start-up and shut-down steam reforming of methane. The catalysts exhibited the “intelligent” properties,
i.e., self-activation and self-regenerative activity.We conclude that well crystallized Mg(Al)O periclase played an important role in the “intelligent” properties of the Pt/Ni/[MgxAl]O catalysts; the periclase acted as an effective Ni reservoir for a reversible reduction–oxidation movement of Ni ions between the outside and the inside of the Mg(Al)O periclase crystals. Surface Ni0 was oxidized to Ni2+ by steam and incorporated into Mg(Ni2+,Al)O periclase, whereas the Ni2+ ions in the periclase were reduced to Ni0 by the hydrogen spillover
forming small Ni0 particles on the catalyst surface.

Keywords:
Mg–Al hydrotalcite
Methane steam reforming
Pt/Ni/Mg(Al)O catalyst
Self-activation
Self-regeneration

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Informasi Detail

Judul Seri

Applied Clay Science

No. Panggil

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Penerbit

London : Elsevier B.V.., 2009

Deskripsi Fisik

Applied Clay Science 45 (2009) 147–154

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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