TGA for BW feedstock was performed via a simultaneous Thermogravimetry & Differential Thermal Analysis analyzer (TG/DTA, Diamond, PerkinElmer Instruments). In order to maintain an anoxic atmosphere for BW pyrolysis, Argon with a flow rate of 100 ml/min was used as sweeping gas. 5-10mg BW powder was put in α-Al2O3 crucibles. Then, BW sample was heated according to follow procedures: (1) Firstly, samples were heated from room temperature to 105°C in heating rate of 10 °C/min; (2) Secondly, once the temperature reached 105°C, samples were maintained at this temperature point for 10min to eliminate adsorptive water; (3) Finally, samples were sequentially heated from 105°C to 700 °C in heating rates of 20, 30 and 40°C/min, respectively. Thermogravimetry (TG) data (%) was recorded every one integer unit temperature (step-size of 1°C) by using assorted software of TG/DTA analyzer. And derivative thermogravimetry (DTG) data was obtained via Numerical Differential Method coupled with Savitzky-Golay smoothing (2nd polynomial order). The TGA tests of each heating rate were performed in triplicate.