Formation of iron oxides in a highly alkaline medium in the presence of palladium ions (CROSBI ID 544464)
Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija
Podaci o odgovornosti
Krehula, Stjepko ; Musić, Svetozar
engleski
Formation of iron oxides in a highly alkaline medium in the presence of palladium ions
The effect of the presence of palladium ions in a highly alkaline precipitation system on the formation of iron oxides was investigated using X-ray powder diffraction (XRPD), Mössbauer and FT-IR spectroscopies, field emission scanning electron microscopy (FE-SEM) and energy dispersive X-ray spectroscopy (EDS). Acicular α -FeOOH particles precipitated in a highly alkaline medium with the addition of tetramethylammonium hydroxide (TMAH) were used as reference material. The initial addition of palladium ions to that precipitation system had a significant effect on the formation of iron oxide phases and their properties. In the presence of palladium ions, the initially formed α -FeOOH has been transformed to α -Fe2O3 crystals in the form of hexagonal bipyramids via a dissolution-reprecipitation mechanism with a simultaneous formation of metallic palladium nanoparticles. These palladium nanoparticles acted as a catalyst for the reductive dissolution of α -Fe2O3 particles and the formation of Fe3O4 crystals in the form of octahedrons. Increase in the initial concentration of palladium ions in the precipitation system accelerated the transformation process α -FeOOH → α -Fe2O3 → Fe3O4 and influenced changes in the shape of α -Fe2O3 and Fe3O4 particles.
Nanosize particles; Palladium; Tetramethylammonium hydroxide; Catalysts; X-ray techniques; Electron microscopy
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
Podaci o prilogu
166-166.
2008.
objavljeno
Podaci o matičnoj publikaciji
Musić, Svetozar ; Ristić, Mira ; Krehula, Stjepko
Zagreb: Institut Ruđer Bošković
978-953-6690-76-3
Podaci o skupu
XXIX European Congress on MOlecular Spectroscopy
poster
31.08.2008-05.09.2008
Opatija, Hrvatska