Thermal behaviour of iron(II) oxalate dihydrate in the atmosphere of its conversion gases

摘要: Using a device for thermogravimetric analysis, dynamic study of thermally induced solid-state transformations FeC2O4·2H2O in the atmosphere allowing full participation gaseous products (CO, CO2, H2O) reaction system was carried out. Solid phases formed at various temperatures between 25 and 640 °C were identified characterized using 57Fe Mossbauer spectroscopy, TG XRD. Up to 230 °C, evolution two molecules water crystallization takes place. Superparamagnetic nanoparticles magnetite (Fe3O4) are as primary product decomposition FeC2O4, together with CO CO2. In next stage above 380 is accompanied by reduction remaining ferrous oxalate iron carbide (Fe3C) carbon monoxide. Thermally conversion into α-Fe expected 400 535 major chemical process. last step, reduced wustite (FeO) monoxide evolved lower temperatures. On grounds quantitative data possible competitive reactions discussed temperature dependent model suggested.