Abstract
Thermal stability and thermal decomposition of succinic acid, sodium succinate and its compounds with Mn(II), Fe(II), Co(II), Ni(II), Cu(II) and Zn(II) were investigated employing simultaneous thermogravimetry and differential thermal analysis (TG-DTA) in nitrogen and carbon dioxide atmospheres and TG-FTIR in nitrogen atmosphere. On heating, in both atmospheres the succinic acid melt and evaporate, while for the sodium succinate the thermal decomposition occurs with the formation of sodium carbonate. For the transition metal succinates the final residue up to 1180 ºC in N atmosphere was a mixture of metal and metal oxide in no 2 simple stoichiometric relation, except for Zn compound, where the residue was a small quantity of carbonaceous residue. For the CO atmosphere the final residue up to 980 ºC was: MnO, FeO, CoO, ZnO and 2 3 4 mixtures of Ni, NiO and Cu, Cu O.
Highlights
Preparation and investigation on the thermal behaviour and thermal decomposition of several metal-ion succinates have been reported
As continuation of our previous study on thermal behavior of succinic acid, sodium succinate and its compounds with some bivalent transition metal ions in air atmosphere [7], this paper deals with the thermal behavior and thermal decomposition of these compounds in dynamic N2 and CO2 atmospheres
For the sodium succinate hexahydrated, the TGDTA curves in N2 and CO2 atmospheres are shown in Fig. 2a and 2b, respectively
Summary
Preparation and investigation on the thermal behaviour and thermal decomposition of several metal-ion succinates have been reported. The TG-DTA curves, Fig 1a and 1b show mass loss in single step between 165 and 260oC (N2, CO2) corresponding to the endothermic peaks at 194 and 247 oC (N2) or 194 and 250 oC (CO2), attributed to the fusion and evaporation of succinic acid, respectively.
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