Volume 1, Issue 4 p. 320-326
Article

Highly Dispersed Gold on Zirconia: Characterization and Activity in Low-Temperature Water Gas Shift Tests

Federica Menegazzo Dr.

Federica Menegazzo Dr.

Dipartimento di Chimica, Università di Venezia and Consorzio INSTM, Dorsoduro 2137, 30123 Venezia, Italy, Fax: (+39) 041-234-8517

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Francesco Pinna Prof.

Francesco Pinna Prof.

Dipartimento di Chimica, Università di Venezia and Consorzio INSTM, Dorsoduro 2137, 30123 Venezia, Italy, Fax: (+39) 041-234-8517

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Michela Signoretto Dr.

Michela Signoretto Dr.

Dipartimento di Chimica, Università di Venezia and Consorzio INSTM, Dorsoduro 2137, 30123 Venezia, Italy, Fax: (+39) 041-234-8517

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Valentina Trevisan Dr.

Valentina Trevisan Dr.

Dipartimento di Chimica, Università di Venezia and Consorzio INSTM, Dorsoduro 2137, 30123 Venezia, Italy, Fax: (+39) 041-234-8517

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Flora Boccuzzi Prof.

Flora Boccuzzi Prof.

Dipartimento di Chimica IFM and NIS Centre of Excellence, Università di Torino, via P. Giuria 7, 10125 Torino, Italy

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Anna Chiorino Prof.

Anna Chiorino Prof.

Dipartimento di Chimica IFM and NIS Centre of Excellence, Università di Torino, via P. Giuria 7, 10125 Torino, Italy

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Maela Manzoli Dr.

Maela Manzoli Dr.

Dipartimento di Chimica IFM and NIS Centre of Excellence, Università di Torino, via P. Giuria 7, 10125 Torino, Italy

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First published: 09 April 2008
Citations: 31

Graphical Abstract

An Au-spicious catalyst: Gold-loaded zirconia (Au-Z) and sulfated zirconia (Au-ZS) catalysts show a high catalytic activity in the low-temperature water gas shift reaction. The sample prepared on sulfated zirconia exhibits higher stability than that prepared on the non-sulfated support. CO chemisorption, IR spectroscopy, and electron microscopy data strongly indicate the presence of highly dispersed, adsorbing gold sites.

Abstract

Gold-loaded zirconia and sulfated zirconia catalysts were tested in the low-temperature water gas shift reaction. The samples were characterized by N2 adsorption analysis, temperature-programmed reduction, X-ray diffraction, pulse-flow CO chemisorption, FTIR spectroscopy, and high-resolution transmission electron microscopy. A reference catalyst, Au/TiO2, provided by the World Gold Council was investigated for comparison. CO chemisorption and FTIR data indicate the presence of only highly dispersed gold clusters on the sulfated sample and both small clusters and small particles on the non-sulfated sample. Both gold–zirconia catalysts are much more active than the Au/TiO2 reference sample over all the temperature range investigated. The sample prepared on sulfated zirconia exhibits higher stability than the catalyst on unmodified zirconia. The prominent role in the water gas shift reaction of gold clusters in close contact with the support was deduced.