Experimental research on pyrolysis of inside SIM from mobile phone using TG-FTIR analyzer

Pyrolysis characteristics of inside SIM from mobile phone with different heating rates were investigated using a thermogravimetric analyzer(TG) coupled with a Fourier transform infrared(FTIR) spectrometer in N2 atmosphere. The effect of heating rate on pyrolysis characteristics,products composition was discussed. The distributed activation energy model(DAEM) was used to study pyrolysis kinetics of inside SIM. The influence of heating rate on activation energy was analyzed. The results showed that:the pyrolysis of inside SIM exhibited one-stage pyrolysis in a temperature range from 350 ℃ to 500 ℃; the maximum pyrolysis rate was up to-62.57%/min; the total thermogravimetric loss was more than 90%. With heating rate rising,pyrolysis initial and final temperatures,the temperature at the maximum pyrolysis rate increased. As a function of conversion rate,the pyrolysis activation energies were between 170—204 kJ/mol. At the 0.2 of conversion rate, the activation energy was up to the maximum and decreased gradully with the reaction process. The main pyrolysis products were benzene and alka(e)ne. But a little nitrogen and chloride was found. Also,there was no significant effect of heating rate on products distribution.