Thermogravimetry Oxidation Tests

Thermogravimetry in inert gas Thermogravimetry in air Pyrolysis (DSC) in inert gas Oxidation test (DSC) in air... 

The present results of thermogravimetry indicate that 165 °C is still too low a temperature to initiate an oxidation process. Therefore isothermal aging tests were carried out for 120 minutes at 250 °C both in argon and in air. Samples of approximately 5 mg weight were... 

Thermogravimetry data shows that all the compounds decompose in two steps. The final product in all cases is the respective metal oxide. However, the intermediate is different in each case for instance, for the iron complex the intermediate is a mixture of Fe(II) and Fe(III) sulfate and the cobalt complex gives cobalt sulfate, whereas the nickel complex gives a mixture of nickel sulfate and nickel sulfide. The formation of these intermediates has been confirmed by observed weight losses in TG as well as chemical analysis of the TG residues after the first step. For the iron complex, the residue obtained at 310 °C is gray and hygroscopic. It gives positive tests for both Fe(II) and Fe(III) in addition to sulfate. 

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