Direct evidence of oxidized gold on supported gold catalysts.
J Phys Chem B
; 109(9): 3704-6, 2005 Mar 10.
Article
in En
| MEDLINE
| ID: mdl-16851411
ABSTRACT
Supported gold catalysts have drawn worldwide interest due to the novel properties and potential applications in industries. However, the origin of the catalytic activity in gold nanoparticles is still not well understood. In this study, time-of-flight secondary ion mass spectroscopy (TOF-SIMS) has been applied to investigate the nature of gold in Au (1.3 wt %)/gamma-Al2O3 and Au (2.8 wt %)/TiO2 catalysts prepared by the deposition-precipitation method. The SIMS spectrum of the supported gold catalysts presented AuO-, AuO2-, and AuOH- ion clusters. These measurements show direct evidence for oxidized gold on supported gold catalysts and may be helpful to gaining better understanding of the origin of the catalytic activity.
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Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
J Phys Chem B
Year:
2005
Document type:
Article