Supported Oxides of Manganese

Supported oxides of manganese have some applications in catalysis. These applications are perhaps not so important as those of chromium, (Sdwood H al., 20.) 

Certain samples obtained as above were then heated for several hours at 600°. This series will be referred to as the high-ignition series, as contrasted with the low-ignition series prepared by ignition at 200°. 

The analytical data required on these samples were (1) manganese, and ( ) active oxygen. For the manganese determination the sample was dissolved in sulfuric acid containing ferrous sulfate. The manganese was then oxidized with sodium bismuthate in nitric acid. The resulting permanganate was titrated with standard ferrous ammonium sulfate. 

For the active oxygen determination a known excess of standard ferrous ammonium sulfate was employed in dissolution of the sample. The excess was then titrated with standard permanganate. 

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