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Palladium–gallium intermetallic compounds for the selective hydrogenation of acetylene Part II: Surface characterization and catalytic performance

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Abstract.
The structurally well-defined intermetallic compounds PdGa and Pd3Ga7 constitute suitable catalysts for
the selective hydrogenation of acetylene. The surface properties of PdGa and Pd3Ga7 were characterized
by X-ray photoelectron spectroscopy, ion scattering spectroscopy and CO chemisorption. Catalytic activity,
selectivity and long-term stability of PdGa and Pd3Ga7 were investigated under different acetylene hydrogenation reaction conditions, in absence and in excess of ethylene, in temperature-programmed and
isothermal long-term experiments. Chemical treatment with ammonia solution—performed to remove
the gallium oxide layer introduced during the milling procedure from the surface of the intermetallic
compounds—yielded a significant increase in activity. Compared to Pd/Al2O3 and Pd20Ag80 reference catalysts,
PdGa and Pd3Ga7 exhibited a similar activity per surface area, but higher selectivity and stability.
The superior catalytic properties are attributed to the isolation of active Pd sites in the crystallographic
structure of PdGa and Pd3Ga7 according to the active-site isolation concept.

Keywords:
Palladium
Gallium
PdGa
Pd3Ga7
Acetylene hydrogenation
Site isolation
Intermetallic compound
X-ray photoelectron spectroscopy
Ion scattering spectroscopy
CO chemisorption
Chemical etching

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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 258 (2008) 219–227

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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