Pyrolysis Characteristics and Kinetics of the Preparation Process of Sludge-Based Activated Carbon by ZnCl_2 Activation Method  

作　　者：Xin Li Guang-Zhi Wang Wei-Guang Li Ping Wang 

机构地区：[1]School of Municipal and Environmental Engineering,Harbin Institute of Technology [2]State Key Laboratory of Urban Water Resource and Environment,Harbin Institute of Technology

出　　处：《Journal of Harbin Institute of Technology(New Series)》2013年第6期29-36,共8页哈尔滨工业大学学报（英文版）

基　　金：Sponsored by the National Natural Science Foundation of China(Grant No.51008106)

摘　　要：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,ZnC12 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.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.

关 键 词：SLUDGE ZNCL2 ACTIVATION pyrolysisCLC number：X705 Document code：AArticle ID：1005-9113（2013）06-0029-08 

分 类 号：TQ564[化学工程—炸药化工] X505[环境科学与工程—环境工程]