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Influence of the support composition on the hydrogenation of acrolein over Ag/SiO2–Al2O3 catalysts

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Abstract.
The gas phase hydrogenation of acrolein over supported silver catalysts has been investigated with a focus
on the influence of the support acidity. Acidity has been varied by preparing silver catalysts supported
on silica/alumina supports with varying SiO2/Al2O3 ratio. After the catalytic experiments the Ag catalysts
exhibit similar particle sizes, as revealed with TEM (transmission electron microscopy). The acidity of the
samples was estimated using TPD of adsorbed ammonia which gives the total acidity of the samples,
furthermore by IR of adsorbed pyridine to identify the Brønsted and Lewis acidity. No Brønsted acidity
was found, and the Lewis acidity showed a clear dependence on the support composition. It is shown that
a high total acidity and a high amount of strong Lewis acid sites on the catalysts cause a low conversion
of acrolein and low selectivity to allyl alcohol. The interaction of silver with the support or effects of the metal–support perimeter are discussed as possible reasons for this behaviour.

Keywords:
Acrolein
Hydrogenation
Ag catalyst
SiO2–Al2O3 support
Acidity

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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 261 (2009) 1–8

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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