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Highly Dispersed Gold on Zirconia: Characterization and Activity in Low‐Temperature Water Gas Shift Tests
Author(s) -
Menegazzo Federica,
Pinna Francesco,
Signoretto Michela,
Trevisan Valentina,
Boccuzzi Flora,
Chiorino Anna,
Manzoli Maela
Publication year - 2008
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.200700152
Subject(s) - cubic zirconia , chemisorption , catalysis , water gas shift reaction , fourier transform infrared spectroscopy , water gas , adsorption , temperature programmed reduction , materials science , heterogeneous catalysis , analytical chemistry (journal) , inorganic chemistry , chemistry , chemical engineering , syngas , organic chemistry , metallurgy , ceramic , engineering
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.