炭分子筛的结构和表面性质对其吸附分离CH_4/N_2和CO_2/N_2的影响  

Effectsof structure and surface property on adsorptive separation of carbon molecular sieve for CH_4/N_2 and CO_2/N_2

作　　者：张薄[1,2] 辜敏[1,2] 鲜学福[1,2] 

机构地区：[1]重庆大学煤矿灾害动力学与控制国家重点实验室,重庆400044 [2]重庆大学复杂煤气层瓦斯抽采国家地方联合工程实验室,重庆400044

出　　处：《功能材料》2012年第20期2858-2862,共5页Journal of Functional Materials

基　　金：重庆市科委科技计划项目院士专项资助项目(CSTC;2010BC6006)

摘　　要：对日本Takeda(CMS-1)、Kuraray(CMS-2)和德国BF(CMS-3)3种炭分子筛(CMS)的孔结构和表面官能团进行了表征,分析了它们对CH4/N2和CO2/N2的吸附平衡和吸附动力学分离性能,以及CMS的结构与表面性质对吸附性能的影响。结果表明,CMS-1和CMS-2可实现CH4/N2的动力学分离,还可实现N2/CO2的平衡分离;CMS-3平衡分离CH4/N2和CO2/N2的效果要优于动力学分离。孔结构是影响炭分子筛分离性能的直接因素,孔径分布的差异使CMS-1和CMS-2对CH4/N2的位阻-动力学分离效应表现得更为明显;表面含氧官能团有利于提高炭分子筛的吸附分离性能。In this paper, with the Takeda（CMS-1） and Kuraray（CMS 2） carbon molecular sieve （CMS） from Ja pan together with the BF CMS（CMS-3） from Germany as adsorbents, we measured the adsorption isotherms by use of hi-precision intelligent gravimetrie analyzer, studied the CMS＇s adsorption equilibrium separating proper- ty and adsorption kinetics on N2, CH4 and CO2, characterized the pore size distribution and surface functional group of CMS. The effects of structure and surface property on adsorptive separation of CMS for CH4/N2 and CO2/N2 were researched. The experimental results showed that the dynamics separation for CH4/N2 and the e- quilibrium separation for CO2/N2 were realizable on CMS-1 and CMS-2. The effect of equilibrium separation for CH4/N2 and CO2/N2 was better than dynamics separation. The pore size was the key factor which affecting CMS＇s adsorptive separation performance. The difference of pore diameter distribution causesd even more ob- vious steric hindrance-dynamics separation effect for CH4/N2 on CMS-1 and CMS-2, as well as the equilibrium separation effect on CMS-3. The oxygen functional group was in favor of improving the adsorptive separation property of CMS.

关 键 词：炭分子筛 CH4 CO2 N2 分离 

分 类 号：O647.31[理学—物理化学] P618.11[理学—化学]