Reactivity with hydrogen of pure iron oxide and of iron oxides doped with oxides of Mn, Co, Ni and Cu

Autor:	D. N. Drakshayani, R. M. Mallya
Rok vydání:	1991
Předmět:	Thermogravimetry chemistry.chemical_compound Hydrogen chemistry Dopant Inorganic chemistry Mössbauer spectroscopy X-ray crystallography Iron oxide Materials Engineering (formerly Metallurgy) chemistry.chemical_element Reactivity (chemistry) Powder diffraction
Zdroj:	Journal of Thermal Analysis. 37:891-906
ISSN:	1572-8943 0368-4466
DOI:	10.1007/bf01932787
Popis:	Using dynamic TG in H2, X-ray powder diffraction and Mössbauer Spectroscopy the reactivities fot hydrogen reduction of Fe2O3 prepared at different temperatures, Fe2O3 doped with oxides of Mn, Co, Ni and Cu prepared at 300DaggerC from nitrate precursors and intermediate spinels derived from above samples during reduction have been explored. The reactivity is higher for finely divided Fe2O3 prepared at 250DaggerC. The reduction is retarded by Mn, marginally affected by Co and accelerated by Ni and Cu, especially at higher (5 at.%) dopant concentration. These reactivities confirmed also by isothermal experiments, are ascribed to the nature of disorder in the metastable intermediate spinels and to hydrogen rsquospill overrsquo effects.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8768b2c138809556bb92dc5b8bf76a2c https://doi.org/10.1007/bf01932787 Zobrazit plný text záznamu Full text from SpringerLink