Abstract
Different structural and electronic states of gold species in H-mordenite with SiO2/Al2O3 molar ratio 206 and their transformations under redox treatments have been studied by the methods of diffuse reflectance UV-visible spectroscopy and FTIR spectroscopy of adsorbed CO. 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 co-existence of several types of active species of gold in CO oxidation - gold clusters <1.5 nm (responsible for low-temperature activity) and gold nanoparticles (responsible for high-temperature activity).
Original language | English |
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Pages (from-to) | 977-980 |
Number of pages | 4 |
Journal | Catalysis Communications |
Volume | 8 |
Issue number | 7 |
DOIs | |
Publication status | Published - Jul 2007 |
Keywords
- Active sites
- Catalyst
- Gold
- Oxidation
- Zeolite
ASJC Scopus subject areas
- Catalysis
- Process Chemistry and Technology