Thermal reaction process of paraffin/stearate mixtures was studied by thermogravimetric–differential scanning calorimetry–Fourier transform infrared spectroscopy (TG–DSC–FTIR) simultaneous experiments under argon and oxygen atmospheres, and the thermal reaction kinetics were estimated through the non-isothermal measurements and model-free isoconversional methods. The results show that all stearates except for magnesium stearate have a positive effect on the oxidation of paraffin at lower temperature, but only cobalt stearate plays a positive effect during the whole oxidation process; the oxidation of paraffin/cobalt stearate mixture could be divided into three stages, and cobalt stearate could decrease the oxidation reaction temperature of paraffin obviously concerning the first stage; however, the catalytic effects could not be improved markedly by adding more cobalt stearate; the increase in activation energy (Ea) with the increase of cobalt stearate may be attributed to the adsorption catalysis system of the oxidation process.
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This work is supported by National Natural Science Foundation of China (Grant No. 51976175 and No. 51606157), Natural Science Basic Research Plan in Shaanxi Province of China (Grant No. 606150897031) and Fundamental Research Funds for the Central Universities (Grant No. 3102017zy007).
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Liu, Ll., Li, Bb., Kang, B. et al. Effect of stearates on the thermal oxidation process of paraffin. J Therm Anal Calorim (2021). https://doi.org/10.1007/s10973-021-10577-w
- Cobalt stearate
- Thermal oxidation reaction
- Activation energy