e-journal

Selective deactivation of gold catalyst

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Abstract.
The progressive poisoning effect of different molecules on carbon supported gold catalysts has been
evaluated during the aerobic oxidation of glucose. A geometrical model has been derived for describing
the morphological properties of two catalysts made of carbon supported gold particles having a known
size distribution centered at 3.30 and 7.89 nm respectively. The observed deactivation trend follows
the order thiocyanate > cyanide ≈ cysteine > thiourea and it obeys an exponential law. The kinetics of
catalyst deactivation has been interpreted by considering the important contribute of electronic factors
which overlap the space shielding of active sites, due to long range poison–catalyst interaction influencing
the entire metal particle. Considering the nature of the molecules showing a high poisoning effect and
the promoting effect of OH−, a molecular model for electronic interactions in gold nanoparticles during
the aerobic oxidation of glucose has been proposed where the dioxygen reduction step is differently
influenced by soft and hard-nucleophiles.

Keywords:
Gold
Catalysis
Poisoning
Molecular model
Oxygen activation
Glucose oxidation

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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 263 (2009) 92–97

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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