430 / 2018-08-15 05:21:23

Effect of Transition Metals on Thermogravimetric Behaviour and Co-pyrolysis Kinetics of Lignin and Polyethylene

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In order to realize the reasonable disposal of biomass and plastic and the recovery of high value-added products, lignin (LG) and polyethylene (PE) were co-pyrolyzed with the addition of transition metals (Ni, Co, Fe and Mn). The thermal behaviour and kinetics of the mixtures affected by the type of transition metals, the concentration of Ni, the ratio of LG to PE and heating rate were investigated according to thermogravimetric analysis. It is found that the initial decomposition temperature of LG and PE in the mixture is decreased by 10-53℃ and 9-18℃, respectively, after the mixture was pre-treated with 0.5 mmol/g Ni, Co, Fe or Mn. The increase of Ni content from 0 to 1 mmol/g resulted in the reduction of initial decomposition temperature of LG from 212 to 174 ℃ in LG/PE. The ratio of LG and PE and heating rate made positive influences on the initial decomposition temperature of LG in mixture. According to the difference of weight loss, the introduction of Fe and Mn appear to make slight influences on altering the interaction between LG and PE while the negative effect of PE on the devolatilization of LG in LG/PE can be greatly diminished with the involvement of Ni and Co. The E value of LG and PE in the mixture is reduced by 6.11-21.62 kJ/mol and 7.67-50.11 kJ/mol, respectively, as 0.5 mmol/g Ni, Co, Fe or Mn were involved. With the increase of Ni content and the ratio of LG to PE, the E value of LG and PE in mixture was gradually reduced while the increase of heating rate resulted in an increase in E value of LG and PE in LG/PE. It hence can be concluded that the thermal behaviour and kinetics of co-pyrolysis of LG/PE greatly changed with the involvement of transition metals.