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Etching of the intermetallic compounds PdGa and Pd3Ga7: An effective way to increase catalytic activity?

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Abstract.
The structurally ordered intermetallic compounds PdGa and Pd3Ga7 constitute highly selective catalysts
for the selective semi-hydrogenation of acetylene. The milling of as-synthesized samples, followed by
etching with ammonia solution increased the activity of the catalysts by factor of 60. Chemically etched
samples possess high activity and simultaneously keep their high selectivity. Chemical analysis confirms
that the etching procedure is mostly specific to gallium species, thus less affecting the palladium.
Detailed investigations reveal the influence of the chemical etching on the morphology and surface of
the particles. As a result of the etching, nano-caverns are formed (SEM and BET), and the surface is
enriched in palladium (XPS and EDX), while the bulk crystal structure is not affected (XRD). The mechanism
and applicability of the etching procedure is discussed in view of the active-site isolation concept.

Keywords:
Intermetallic compounds
PdGa
Pd3Ga7
Active-site isolation
Chemical etching
Palladium
Gallium
Selective hydrogenation
Acetylene
In situ XPS

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Informasi Detail

Judul Seri

Journal of Catalysis

No. Panggil

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Penerbit

London : Elsevier Inc.., 2009

Deskripsi Fisik

Journal of Catalysis 264 (2009) 93–103

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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