磷化氢在改性13X分子筛上的吸附行为  

Adsorption characteristics of phosphine on modified 13X molecular sieve

作　　者：余琼粉[1] 易红宏[1] 唐晓龙[1] 宁平[1] 王红妍[1] 杨丽娜[1] 于丽丽[1] 李华[1] 王驰[1] 杨丽萍[1] 

机构地区：[1]昆明理工大学环境科学与工程学院,云南昆明650093

出　　处：《化学工程》2009年第12期1-4,23,共5页Chemical Engineering(China)

基　　金：云南省中青年学术和技术带头人后备人才项目(2007PY01-10);云南省教育厅科学研究重点基金项目(07Z11402);云南省自然科学基金面上项目(2001E0011Q);校引进人才基金项目(14118017);昆明理工大学学生课外学术科技创新基金(2008BA081)

摘　　要：为回收工业废气中的磷化氢(PH3)并资源化,采用浸渍法制备了一种CaCl2改性13X分子筛吸附剂,通过容积法研究了25—70℃PH3气体在改性13X分子筛上的等温吸附行为。结果表明,在实验条件范围内25,40,55,70℃下PH3的饱和吸附量(质量分数)分别为2.528,1.901,1.591,0.925mg/g。Freundlich吸附等温方程很好地模拟了改性13X分子筛对PH3的等温吸附,Langmuir和Henry吸附等温方程对吸附平衡数据的拟合效果不佳表明了改性13X分子筛表面吸附位的不均匀分布。当初始吸附量为0.10mg/g时,等量吸附热值最大,为17.81353kJ/mol,即等量吸附热不超过18kJ/mol,过程为物理吸附,便于PH3气体的解吸。To recover and utilize molecular sieve was prepared phosphine （PH3 ） from industrial offgas, the adsorbent of CaCl2 immersed 13X The isotherm adsorption characteristics of phosphine gas on the modified 13X molecular sieve were investigated at 25-70℃ by using volumetric method. The results show that the adsorptive mass fraction of phosphine onto the modified 13X molecular sieve at different temperatures were as follows ： 2. 528, 1. 901, 1. 591, 0. 925 mg/g at 25, 40, 55, 70℃ respectively. Freundlich adsorption isotherm equation is more suitable for the description of adsorption process, and the fitting results of Langmuir and Henry equations indicate the heterogeneous characteristics of modified adsorbent. The maximum isosteric heat of adsorption is 17.813 53 kJ/mol at the beginning of adsorption process, which is less than 18 kJ/mol and means that this process is a physical adsorption and convenient for phosphine gas desorption.

关 键 词：磷化氢 改性13X分子筛 吸附 吸附等温方程 吸附热 

分 类 号：O647.32[理学—物理化学] X701[理学—化学]