Fabrication of Activated Carbon Using Two-Step Co-Pyrolysis of Used Rubber and Larch Sawdust

Jing Geng, Lu-Fei Li, Wen-Liang Wang, Jian-Min Chang, Chang-Lei Xia, Li-Ping Cai, Sheldon Q. Shi

Abstract


Characteristics of the char produced in the co-pyrolysis of used rubber and larch sawdust were studied in the conversion of low-valued pyrolysis char into value-added activated carbon using two-step co-pyrolysis, namely pyrolysis and activation processes. The physicochemical characteristics of the chars were examined by X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET), and scanning electron microscopy (SEM). The results revealed that after the two-step co-pyrolysis, the upgraded carbon had BET surface areas ranging from 600 m2 g−1 to 900 m2 g−1, which were higher than the requirements for activated carbon (American Water Works Association B600 standard). Additionally, as the sawdust/rubber ratio increased, the BET value increased accordingly. A possible reaction mechanism is proposed based on the experimental results during the activation process.

Keywords


Used rubber; Larch sawdust; Co-pyrolysis; Activated carbon; BET surface value

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