Authors:Agnieszka Jabłońska–Wawrzycka, Małgorzata Zienkiewicz, Maciej Hodorowicz, Patrycja Rogala, and Barbara Barszcz
residues are different. As a result of high concentration of oxygen in furnace atmosphere oxidation process occurs and as a final product of thermal decomposition non-stoichiometric mixtures of manganeseoxides Mn 2 O 3 are formed (Tables 8 , 9 ) [ 42
Authors:Renato Vessecchi Lourenço, Marcelo Kobelnik, Clóvis Augusto Ribeiro, and Fernando L. Fernonani
hematite (Fe 2 O 3 ) and zinc silicates (ZnSiO 4 ). However, after the calcinations, the obtained aerobic residues demonstrate the presence of others characteristic lines, which were attributed to silicate (SiO 2 ) and manganeseoxide (MnO) compounds ( Fig
. Examples include natural and synthetic zeolites, clay minerals, and oxides (alumina, ferrites, goethite, and manganeseoxide) [ 1 ].
Literature references present the possibilities of use of various mineral and carbon substances to produce complex
“Effects of ZnO and MoO 3 doping on surface and catalytic properties of manganeseoxide supported on alumina system” S. M. Ibrahim , G. A. El-Shobaky , G. M. Mohamed , N. A. Hassan The Open Catalysis Journal 2011 , 4 , 27 – 35
contain other minerals such as clays, mica, quartz which reflects their geological source and method of preparation. Brown ochres and umbers contain additional manganeseoxides which give them their darker colour. Studies of a paint cross section from the