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How Different Characterization Techniques Elucidate the Nature of the Gold Species in a Polycrystalline Au/TiO 2 Catalyst
Author(s) -
Grünert Wolfgang,
Großmann Dennis,
Noei Heshmat,
Pohl MargaMartina,
Sinev Ilya,
De Toni Andrea,
Wang Yuemin,
Muhler Martin
Publication year - 2014
Publication title -
chemie ingenieur technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.365
H-Index - 36
eISSN - 1522-2640
pISSN - 0009-286X
DOI - 10.1002/cite.201400039
Subject(s) - characterization (materials science) , crystallite , catalysis , spectroscopy , precipitation , adsorption , absorption spectroscopy , x ray absorption spectroscopy , materials science , deposition (geology) , chemical engineering , absorption (acoustics) , nanotechnology , analytical chemistry (journal) , chemistry , environmental chemistry , metallurgy , organic chemistry , geology , physics , optics , paleontology , engineering , quantum mechanics , sediment , meteorology , composite material
Abstract TiO 2 ‐supported gold species were prepared via the deposition‐precipitation route, with conservation of the initial speciation by freeze‐drying. The structural and electronic properties of the Au species were investigated by X‐ray absorption spectroscopy, electron microscopy, and IR spectroscopy of adsorbed CO in four states. Exclusively Au III was deposited on the TiO 2 surface in patches ranging from isolated Au ions to three‐dimensional clusters. This paper illustrates in detail the unique contributions of all characterization techniques to this structural model.