萘在典型介孔碳上的脱附性能研究  

Study of Naphthalene Desorption Properties on Typical Mesoporous Carbons

作　　者：李子宜[1] 刘应书[1,2] 杨雄[1,2] 孟苗苗[1] 张传钊[3] 

机构地区：[1]北京科技大学能源与环境工程学院,北京100083 [2]北京科技大学北京高校节能与环保工程研究中心,北京100083 [3]北京联合大学生物化学工程学院,北京100101

出　　处：《工程热物理学报》2017年第7期1478-1484,共7页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51478083;No.21676025);北京市自然科学基金资助项目(No.8174064)

摘　　要：本文基于程序升温脱附(TPD)热重实验对典型多环芳烃,萘,在三种典型介孔碳CMK-3、CMK-5和FDU-15以及传统椰壳活性炭(AC)上的脱附性能进行了研究。采用Kissinger方程预估、Coats-Redfern方程求算、主曲线法校验的组合式热分析方法准确获取了萘在四种吸附剂上的脱附动力学三因子(脱附活化能E_a、指前因子lnA与机理函数)。结果表明,CMK-3、CMK-5和FDU-15对萘的脱附再生性能明显优于椰壳AC,脱附峰值温度排序呈:CMK-5<CMK-3≈FDU-15<椰壳AC。萘在椰壳AC(E_a=101.5 kJ/mol)上的脱附内扩散阻力最大,CMK-3(E_a=67.0 kJ/mol)居其次,二者均为扩散控速。萘在CMK-5(E_a=58.3 kJ/mol)与FDU-15(Ea=46.5 kJ/mol)上的脱附过程均为反应控速,CMK-5由于微孔较多而E_a较高,但较FDU-15具备更为有序的多类型孔道分布,整体上对萘的脱附性能最佳。In this work,desorption kinetics of naphthalene as a typical polycyclic aromatic hydrocarbon on three typical mesoporous carbons,CMK-3,CMK-5 and FDU-15,and a conventional coconut-shell activated carbon（AC） has been studied through temperature programmed desorption（TPD） thermogravimetric experiments.A combined thermogravimetric analysis method with estimation by the Kissinger equation,calculation by the Coats-Redfern equation,and verification by the masterplot method,is adopted to accurately achieve the kinetic triplets（the desorption activation energy,Ea,the pre-exponent factor,ln A,and the desorption reaction model） for naphthalene desorption on four adsorbents.The results show that desorption performances on CMK-3,CMK-5 and FDU-15 are significantly better than on the coconut-shell AC,rendering the order of the desorption peak temperature：CMK-5CMK-3≈FDU-15coconut-shell AC.Desorption of naphthalene on coconut-shell AC（Ea=101.5 kJ/mol） show great internal diffusion resistance,followed by CMK-3（Ea=67.0 kJ/mol）,both with diffusion as the rate-controlling step.With reaction as the rate-controlling step,desorption of naphthalene on CMK-5（58.3 kJ/mol） and FDU-15（46.5 kJ/mol）show smallerEa.For CMK-5,Ea is higher compared to FDU-15 due to higher microporosity,whereas a more orderly distributed multi-type pore channels makes it the best adsorbent in this study in terms of the overall performance of naphthalene desorption.

关 键 词：多环芳烃 介孔吸附剂 大气污染 脱附动力学 热分析 

分 类 号：X511[环境科学与工程—环境工程]