Manganese oxide oxidation with

Table 1. Crystallographic data for manganese oxides with tunnel structures... 

The enormous variety of manganese oxides with structures similar to the one shown in Fig. 8 arises from the different cation and water content of the space be-... 

Strangely enough, a combination similar to the ammonia catalyst, iron oxide plus alumina, yielded particularly good results (32). Together with Ch. Beck, the author found that other combinations such as iron oxide with chromium oxide, zinc oxide with chromium oxide, lead oxide with uranium oxide, copper oxide with zirconium oxide, manganese oxide with chromium oxide, and similar multicomponent systems were quite effective catalysts for the same reaction (33). 

Step 1. Extraction of the acid soluble fraction (i.e., carbonates) with CH3COOH Step 2. Extraction of the reducible fraction (i.e., iron/manganese oxides) with hydroxyl amine hydrochloride... 

Low-temperatnre methods provide yielding of lithium-manganese oxides with more oxidized manganese cations since manganese ions are stable preferentially as at lower temperatnre. 

Manganese oxide with iron oxide Pink, deep purple, black... 

Thus lithiated manganese oxides with a substantial amount of nickel and other elements could play a crucial role in stabilizing the layered crystal structure, thereby improving the electrochemical characteristics. 

Manganese(ll,III) oxide (mineral hausmannite) is formed by heating manganese oxides with other valency states in air at 890°C, e.g. ... 

Hem, j. D., C. J. Lind, and C. E. Roberson. 1989. Co-precipitation and redox reactions of manganese oxides with copper and nickel. Geochim. Cosmochim. Acta 53 2811-22. 

It has been reported that use of a 0.01 to 0.1 mol L hydroxylamine hydrochloride solution acidified at pH 2 causes the selective dissolution of manganese oxides with minimum extraction of iron oxides (Shuman, 1985 Kersten and Forstner, 1986 Berti and Cunningham, 1997). Nevertheless, the low pH value may lead to a partial release of TE bound to organic matter. The separated reducible fraction can thus be overestimated. An improved method for the selective dissolution of manganese oxides involving a nonacidified 0.1 mol L hydroxylamine solution at pH 3.6 as a leachant has been proposed by Neaman et al. (2004). Actually, the nonacidified hydroxylamine solution is not expected to dissolve considerable amounts of iron oxides, organic matter, or... 

Zinc and manganese oxides with chromium oxide Pumice — Acetylene Acetone (57)... 

Hydrothermal Synthesis of Manganese Oxides with Tunnel Stmctures... 

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