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 

作者机构：School of Municipal and Environmental EngineeringHarbin Institute of Technology State Key Laboratory of Urban Water Resource and EnvironmentHarbin Institute of Technology 

出 版 物：《Journal of Harbin Institute of Technology(New Series)》 (哈尔滨工业大学学报（英文版）)

年 卷 期：2013年第20卷第6期

页      面：29-36页

核心收录：

学科分类：0810[工学-信息与通信工程] 081702[工学-化学工艺] 07[理学] 08[工学] 0817[工学-化学工程与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0713[理学-生态学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

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

主　　题：动力学参数 活化污泥 热解特性 氯化锌 活化法 活性炭 制备工艺 傅立叶变换红外光谱法 

摘      要：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.