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Online-Coupled TG-FTIR Investigations Of Cobalt Acetate Tetrahydrate

Tang Wanjun, Chen Donghua

Thermal processes involved in the decomposition course of cobalt acetate tetrahydrate (Co(CH3COO)2·4H2O) in atmosphere of N2 and H2 were monitored by non-isothermal gravimetry. Results showed that the dehydration of the parent salt occurs in two steps. The dehydration step was followed by one-step major decomposition of the acetate group, forming intermediate basic acetate, which then produces CoO and Co, in treatment atmospheres of N2 and H2, respectively. The conclusions were confirmed by monitoring solid residues and evolved gases employing IR spectrometry. A set of reactions linked to the decomposition of cobalt acetate was proposed to account for the solid and gas products detected.