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Au/ZnO as catalyst for methanol synthesis: The role of oxygen vacancies

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Abstract.
Gold catalysts supported on zinc oxide with Au loadings of 1, 2, and 3 wt% were prepared by the colloidal
deposition method and applied in methanol synthesis in CO2-free (CO + H2) and in CO2-containing
(CO + CO2 + H2) synthesis gas. The characterization by transmission electron microscopy and X-ray
diffraction before and after the catalytic high-pressure tests demonstrated a very narrowand uniform Au
particle size distribution and a high stability against sintering. Reactive frontal chromatography (RFC)
experiments with N2O were performed aiming at the titration of oxygen vacancies. With increasing Au
loading, the amount of consumed N2O increased in good correlation with the number of Au perimeter
atoms present in the Au/ZnO catalysts suggesting an enhanced formation of oxygen vacancies at the Au/
ZnO interface. In both synthesis gas mixtures the presence of the Au particles led to an increased activity
compared with pure ZnO. All Au/ZnO samples exhibited higher catalytic activity in the absence of CO2, as
had been observed for pure ZnO with similar apparent activation energy. It is concluded that oxygen
vacancies in ZnO are also the active sites in methanol synthesis over Au/ZnO, and that the presence of the
Au particles enhances the number of exposed oxygen vacancies in ZnO, presumably located at the
interface region.

Keywords: Gold catalysts, ZnO, Methanol synthesis, Oxygen vacancies, N2O reactive frontal chromatography

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Informasi Detail

Judul Seri

Applied Catalysis A: General

No. Panggil

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Penerbit

London : Elsevier B.V.., 2009

Deskripsi Fisik

Applied Catalysis A: General 359 (2009) 121–128

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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