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Preparation and catalytic properties of uniform particles of Ni3Ge intermetallic compound formed inside the mesopores of MCM-41

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Abstract.
Uniform particles of Ni3Ge intermetallic compound (IMC) were prepared inside the pores of MCM-41
mesoporous silica with various mesopore diameters. XRD and TEM revealed that Ni–Ge/MCM-41 thus
prepared contained mainly fine metallic particles smaller than the pore size. IR spectra of adsorbed CO
suggest the formation of a Ni–Ge IMC, probably Ni3Ge, and the electron transfer from Ni to Ge. For
H2–D2 equilibration, Ni3Ge/MCM-41 had higher intrinsic activity than Ni/MCM-41 because of the high
activity of Ni atoms at the corner and edge sites. Among MCM-41 and SiO2 supports, those with smaller
mesopores gave higher activity. The similar effect of pore size also was observed for the hydrogenation of
cyclohexene. The difference in activity is discussed in terms of the confinement effect inside mesopores.
For the hydrogenation of acetylene, Ni3Ge gave higher ethylene selectivity than Ni because of the
geometric and electronic effects through the formation of IMC.

Keywords:
Intermetallic compound
Mesoporous silica
Nickel
Germanium
MCM-41
Nano-particle
Hydrogenation
Acetylene
Confinement effect

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Informasi Detail

Judul Seri

Journal of Catalysis

No. Panggil

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Penerbit

London : Elsevier Inc.., 2008

Deskripsi Fisik

Journal of Catalysis 259 (2008) 174–182

Bahasa

English

ISBN/ISSN

00219517

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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