Abstract
Electronic states of gold nanoparticles in mordenite and their transformations under redox treatments have been studied by the methods of FTIR spectroscopy of adsorbed CO and diffuse reflectance UV-visible spectroscopy. Different states of ionic and metallic gold were detected in the zeolite channels and on the external surface of the zeolite - Au+ and Au3+ ions, charged clusters Aunδ +, and neutral nanoparticles Aum. Catalytic tests of the samples revealed the existence of two types of active sites of gold in CO oxidation - gold clusters <2 nm (low-temperature activity) and gold nanoparticles (high temperature activity).
Original language | English |
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Pages (from-to) | 3792-3795 |
Number of pages | 4 |
Journal | Surface Science |
Volume | 601 |
Issue number | 18 |
DOIs | |
Publication status | Published - 15 Sep 2007 |
Keywords
- FTIR
- Gold catalysts
- Nanoparticles
- UV-visible spectroscopy
- Zeolites
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Condensed Matter Physics
- Surfaces and Interfaces