A modified microwave thermo-gravimetric-analyzer for kinetic purposes

作者：Farag Sherif; Chaouki Jamal^*

来源：Applied Thermal Engineering, 2015, 75: 65-72.

DOI：10.1016/j.applthermaleng.2014.09.038

• Microwave heating
• Microwave-thermo-gravimetric analyzer
• Microwave pyrolysis
• Reaction kinetics

Apply of microwave heating in a chemical reaction makes the investigation of reaction kinetics rather complex, for the challenges of measuring reaction temperature and reactants' weight during the exposure time. To involve solving these matters, an original bench-scale experimental setup was built. This setup is called microwave thermo-gravimetric-analyzer (MW-TGA), because it works as a traditional thermo-gravimetric-analyzer using microwave heating instead of conventional heating. In addition, MW-TGA is equipped with an innovated thermometer (air-thermometer) that does not suffer from the traditional thermometer drawbacks, particularly when microwave heating is implemented. The efficiency of the air-thermometer was validated using a traditional thermocouple thermometer, an average percentage relative error of 5% of the reference value was found. Eventually, MW-TGA was employed to examine the kinetics of microwave pyrolysis of sawdust. The estimated kinetic parameters were 54.5 +/- 1.5 kJ/mol, 3 +/- 0.9 x 10(5) min(-1), and 2 for the reaction activation energy, pre-exponential factor, and reaction order, respectively.

• 出版日期2015-1-22