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Characterization of the Oxidation States of Supported Gold Species by IR Spectroscopy of Adsorbed CO
Author(s) -
Mihaylov M.,
Knözinger H.,
Hadjiivanov K.,
Gates B. C.
Publication year - 2007
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.200700029
Subject(s) - adsorption , catalysis , spectroscopy , oxidation state , ionic bonding , metal , chemistry , infrared spectroscopy , characterization (materials science) , inorganic chemistry , absorption spectroscopy , photochemistry , materials science , nanotechnology , ion , organic chemistry , quantum mechanics , physics
The use of IR spectroscopy of adsorbed CO for determination of gold speciation on supported gold catalysts is reviewed. Different ionic and metallic sites (Au 3+ , Au + , Au 0 , and Au – ) can be differentiated on the basis of the frequency and stability of their surface carbonyl species formed after CO adsorption. In addition, the study of CO adsorption and reaction with other gases can provide unique information on the mechanisms of catalytic reactions with participation of CO. Finally, results from complementary techniques such as X‐ray absorption spectroscopy, also useful for determination of gold oxidation state, are briefly considered.