The thermal decomposition of Mn2O3 and the reduction of Mn3O4 by C and CO

Autor:	G. J. W. Kor
Rok vydání:	1978
Předmět:	Inorganic chemistry Thermal decomposition Metals and Alloys Oxide chemistry.chemical_element Coke Condensed Matter Physics Decomposition Dilution Catalysis chemistry.chemical_compound chemistry Chemical engineering Mechanics of Materials Materials Chemistry Graphite Carbon
Zdroj:	Metallurgical Transactions B. 9:307-311
ISSN:	2379-0229 0360-2141
Popis:	The thermal decomposition of Mn2O3 was studied at 1000°. The rate of decomposition was inherently fast and dependent on the mass-transfer characteristics of the geometry used. The rate of reduction of Mn3O4 by CO, coconut charcoal, coke, and pure graphite was investigated in the temperature range 900 to 1200°. It was found that the rate of reduction in CO was fast and that the overall rate of reduction by carbon was determined by the oxidation of the carbon by CO2. In general the rate was higher for higher tempera tures and for smaller particle sizes of the oxide and the carbon. Gases such as He, Ar, or N2 were found to decrease the rate because of the dilution effect due to back diffusion into the interparticle pores of the oxide-carbon mixture. It was further found that the oxidation of carbon by CO2 was catalyzed by Mn3O4. This effect was particularly pronounced when the reductant was either graphite or coke.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2432beb0ddbfa6f3b3c7ee6cdc8f0de2 https://doi.org/10.1007/bf02653697 Zobrazit plný text záznamu