فهرست نشریات علمی دسترسی آزاد ایران

The main objective of this study is to develop a controllable, rapid, and energy-efficient resistance-heating method for synthesizing and drying high-purity, thermally stable KO₂ particles. To achieve this goal, key processing parameters were systematically optimized, and the resulting KO₂ particles were evaluated for purity, active oxygen content, thermal stability, and decomposition kinetics. A Taguchi experimental design was applied to systematically optimize key processing parameters of the resistance heating method, such as voltage and electrode gap. The synthesized KO₂ particles were characterized by ThermoGravimetric Analysis (TGA) to assess their thermal stability and decomposition behavior. The efficient heating of the resistance heating process, which was optimized at a voltage of 210 V and an electrode gap of 5 cm (or a voltage gradient of 42 V/cm), yielded KO2 particles that were highly pure and containing active oxygen (13.1% by 50% H2O2 and 15.2% by 85% H2O2) with less energy consumption (61.2 kWh/kg KO2) and the lowest drying time (35 s) than the previously used methods. The thermogravimetric analysis indicated full decomposition at 85°C in 240 min and 65°C in 600 min, indicating improved thermal stability. Kinetic analysis yielded an activation energy of 61.5 kJ/mol, consistent with a diffusion-controlled (F3) reaction mechanism. The resistance heating process is optimized and allows fast and uniform drying of highly purified and thermally stable KO₂ particles. Kinetic analysis verified predictable decomposition, which means that there is controlled particle synthesis with less energy expenditure than traditional procedures, which makes kinetic analysis probable for use in oxygen generation applications.