| Related citation: | Xin Li,Guang-Zhi Wang,Wei-Guang Li,Ping Wang.Pyrolysis Characteristics and Kinetics of the Preparation Process of Sludge-Based Activated Carbon by ZnCl2 Activation Method[J].Journal of Harbin Institute Of Technology(New Series),2013,20(6):29-36.DOI:10.11916/j.issn.1005-9113.2013.06.005. |
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| Author Name | Affiliation | | Xin Li | School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China | | Guang-Zhi Wang | School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China | | Wei-Guang Li | School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China | | Ping Wang | School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China |
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| Abstract: |
| To obtain the pyrolysis characteristics and kinetics of preparation process of sludge-based activated carbon by ZnCl2 activation method (i.e. the pyrolysis process of the sludge with ZnCl2 activation), the characteristic of mass loss and gas products generated during pyrolysis of the sludge with ZnCl2 activation 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 ZnCl2 in the pyrolysis process of the sludge with ZnCl2 activation was also illustrated through the comparison of the pyrolysis characteristics and kinetics of the sludge with and without ZnCl2 activation. The results showed that the pyrolysis process of the sludge with ZnCl2 activation 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 and 9885.16-8.08×1011 min-1, respectively. During the pyrolysis of sludge, ZnCl2 not 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. |
| Key words: sludge ZnCl2 activation pyrolysis |
| DOI：10.11916/j.issn.1005-9113.2013.06.005 |
| Clc Number:X705 |
| Fund: |
