标定体积对超临界温度气体吸附等温线的影响  

Influence of Calibration Volume on Adsorption Isotherms at Supercritical Temperature

作　　者：解晨[1] 郑青榕[1] 廖海峰[1] 智会杰[1] 

机构地区：[1]集美大学轮机工程学院福建省船舶与海洋重点实验室,厦门361021

出　　处：《武汉理工大学学报（交通科学与工程版）》2012年第1期158-160,共3页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：福建省高等学校新世纪优秀人才计划项目(批准号:Z80136);福建省科技厅高校专项项目(批准号:JK2010030)资助

摘　　要：根据容积法原理,利用赛特拉姆气体吸附仪测量超临界温度下氢气在活性炭上的吸附等温线,并通过Gibbs关于吸附的定义,讨论了死体积的标定精度方法对计算吸附量所产生的影响.结果表明,死体积标定的误差对低压下吸附量的计算影响不大,但对高压下吸附量的计算影响明显;活性炭比表面积越大,同一温度下出现最大过剩吸附量所需要的平衡压力越高.According to the principle of volumetric method for adsorption measure, hydrogen adsorp- tion isotherm at 77 K on SAC-02 activated carbon was measured by using Setaram Pro ELSE. Adsorp- tion data was analyzed by the definition of adsorption described by Gibbs, and the in influence of the dead volume of the adsorption system on the accuracy of the isotherm was further discussed. Results show that the method of the volume calibration has little impact to the adsorption isotherm at low pressure region, but the influence will be enhanced while the equilibrium pressure gets higher. Con- clusions were drawn that, at the same temperature, a larger pressure corresponding to the maximum point of the excess adsorption isotherm was needed while the activated carbon had a higher specific surface area.

关 键 词：超临界吸附 吸附等温线 死体积 

分 类 号：TK91[动力工程及工程热物理]