Oxidation reactivity and kinetic analysis of bituminous coal char from high-temperature pyrolysis: Effect of heating rate and pyrolysis temperature
- Release Time:2025-04-30
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2025-04-30Title of Paper:
Oxidation reactivity and kinetic analysis of bituminous coal char from high-temperature pyrolysis: Effect of heating rate and pyrolysis temperatureJournal:
Thermochimica ActaSummary:
Non-isothermal thermogravimetry (TGA) is conducted at four heating rates to determine the kinetic parameters and oxidation reactivity. The ignition ( T i ), peak ( T p ) and burnout ( T e ) temperature and reactivity index S are calculated. Isoconversional method is adopted to determine the activation energy ( E α ) and frequency factor ( A α ). The rate constant ( k(T) ) is obtained by the kinetic parameters. The results show that S is strongly dependent on the TGA heating rate, while T i , T p and T e are independent of the heating rate. With the increase of pyrolysis temperature, T i monotonically increases, while the reactivity evaluated at T p , T e and k(T) ranks as char-1000< char-1200< char-800< char-600. A significant variation in T i , T p , T e and k(T) is observed between char-800 and char-1000. The compensation effect between thermal annealing and surface structure evolution determines the reactivity with the pyrolysis temperature. The mass loss at a higher heating rate is predicted based on E α and A α .Co-author:
Xing Liu, Houzhang Tan, Xuebin Wang, Zhao Wang, Xiaohe XiongTranslation or Not:
NoDate of Publication:
2020-06-15