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《哈尔滨工业大学学报：英文版》
>Pyrolysis Characteristics and Kinetics of the Preparation Process of Sludge-Based Activated Carbon by ZnCl_2 Activation Method
Pyrolysis Characteristics and Kinetics of the Preparation Process of Sludge-Based Activated Carbon by ZnCl_2 Activation Method
To obtain the pyrolysis characteristics and kinetics of preparation process of sludge-based activated carbon by ZnCl2activation method( i. e. the pyrolysis process of the sludge with ZnCl2activation),the characteristic of mass loss and gas products generated during pyrolysis of the sludge with ZnCl2activation were analyzed by thermogravimetric analysis coupled with Fourier Transform Infrared Spectroscopy( TG-FTIR). The kinetic parameters were calculated by the Coats-Redfem method and the mechanism models were established.The role of ZnCl2in the pyrolysis process of the sludge with ZnCl2activation was also illustrated through the comparison of the pyrolysis characteristics and kinetics of the sludge with and without ZnCl2activation. The results showed that the pyrolysis process of the sludge with ZnCl2activation can be divided into four stages including the dehydration of sludge and initial depolymerization of a small portion of organics matters,the decomposition of large molecular organic matters into small molecular intermediates,the further degradation of intermediates and volatilization of ZnCl2,and the decomposition of inorganic minerals and undecomposed organic matters. CO2,CO,CH4,H2O,some aldehydes and carboxylic acids are the major pyrolysis gaseous products. The activation energies and pre-exponential factors are in the range of 28. 84- 206. 42 kJ / mol and9885. 16-8. 08 × 1011min-1,respectively. During the pyrolysis of sludge,ZnCl2not only can function as a dehydration agent and inhibit the formation of tar,but also can peptize the organic matters in the sludge,making them easier to be decomposed.
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