effective energy generation through pyrolysis process. Thermogravimetric experiments were
carried out at five heating rates (10, 20, 30, 40 and 50° C min− 1) and particle sizes (< 0.2,
0.2–0.5, 0.5–1, 1–1.5 and 1.5–2 mm). Effect of particle size on functional, morphological and
structural characteristics of biochar were studied. The activation energy of redgram stalk was
calculated by KAS and FWO methods and was in the range of 132.16–175.76 kJ mol− 1 and …