Pregled bibliografske jedinice broj: 376268
Formation of iron oxides in a highly alkaline medium in the presence of palladium ions
Formation of iron oxides in a highly alkaline medium in the presence of palladium ions // EUCMOS 2008, XXIX European Congress on MOlecular Spectroscopy, Book of Abstracts / Musić, Svetozar ; Ristić, Mira ; Krehula, Stjepko (ur.).
Zagreb: Institut Ruđer Bošković, 2008. str. 166-166 (poster, međunarodna recenzija, sažetak, znanstveni)
CROSBI ID: 376268 Za ispravke kontaktirajte CROSBI podršku putem web obrasca
Naslov
Formation of iron oxides in a highly alkaline medium in the presence of palladium ions
Autori
Krehula, Stjepko ; Musić, Svetozar
Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni
Izvornik
EUCMOS 2008, XXIX European Congress on MOlecular Spectroscopy, Book of Abstracts
/ Musić, Svetozar ; Ristić, Mira ; Krehula, Stjepko - Zagreb : Institut Ruđer Bošković, 2008, 166-166
ISBN
978-953-6690-76-3
Skup
XXIX European Congress on MOlecular Spectroscopy
Mjesto i datum
Opatija, Hrvatska, 31.08.2008. - 05.09.2008
Vrsta sudjelovanja
Poster
Vrsta recenzije
Međunarodna recenzija
Ključne riječi
Nanosize particles; Palladium; Tetramethylammonium hydroxide; Catalysts; X-ray techniques; Electron microscopy
Sažetak
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.
Izvorni jezik
Engleski
Znanstvena područja
Kemija
POVEZANOST RADA
Projekti:
098-0982904-2952 - Sinteza i mikrostruktura metalnih oksida i oksidnih stakala (Ristić, Mira, MZOS ) ( CroRIS)
Ustanove:
Institut "Ruđer Bošković", Zagreb
