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ISSN Druckformat: 2150-766X
ISSN Online: 2150-7678
Indexed in
FORMATION OF PYROPHORIC IRON PARTICLES BY H2 REDUCTION OF OXALATE AND OXIDES
ABSTRAKT
The thermal decomposition and reduction of Fe-oxalate to form pyrophoric iron particles were investigated. Decomposition and reduction experiments were performed in a tubular quartz reactor at 450−520°C under reducing environment of 5−50 vol% H2 and 95−50 vol% N2. Thermogravimetric analysis (TGA) and Differential Scanning Calorimetry (DSC) revealed that the decomposition of Fe-oxalate in an inert atmosphere is a two-step process involving the removal of water and decomposition of oxalate to iron oxides. In the presence of H2, the products of decomposition are reduced into α-Fe particles. The results have shown that Fe-particles generated from oxalate are pyrophoric in air and burn within 15−30 seconds with maximum temperatures generated in the range of 620−820°C. The effect of reduction temperature, H2 concentration, and sample geometry on pyrophoric behavior was also investigated. In other efforts, Fe-oxalate was synthesized from FeCl2.2H2O and its pyrophoric performance was compared with the commercial material.
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