Highly Dispersed Gold on Zirconia: Characterization and Activity in Low-Temperature Water Gas Shift Tests
✍ Scribed by Federica Menegazzo; Francesco Pinna; Michela Signoretto; Valentina Trevisan; Flora Boccuzzi; Anna Chiorino; Maela Manzoli
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 2008
- Tongue
- English
- Weight
- 376 KB
- Volume
- 1
- Category
- Article
- ISSN
- 1864-5631
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
Gold‐loaded zirconia and sulfated zirconia catalysts were tested in the low‐temperature water gas shift reaction. The samples were characterized by N~2~ adsorption analysis, temperature‐programmed reduction, X‐ray diffraction, pulse‐flow CO chemisorption, FTIR spectroscopy, and high‐resolution transmission electron microscopy. A reference catalyst, Au/TiO~2~, 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/TiO~2~ 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.