论文部分内容阅读
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。
In order to recycle phosphine (PH3) in industrial waste gas and recycle it, a CaCl2-modified 13X molecular sieve adsorbent was prepared by impregnation method. The isothermal temperature of 25-70 ℃ PH3 gas on modified 13X molecular sieve was studied by volumetric method Adsorption behavior. The results showed that the saturated adsorption amount (mass fraction) of PH3 at 25, 40, 55 and 70 ℃ were 2.528, 1.901, 1.591 and 0.925 mg / g respectively under the experimental conditions. Freundlich adsorption isotherm well simulated the isothermal adsorption of PH3 on modified 13X molecular sieve. The poor fitting effect of Langmuir and Henry adsorption isotherms on the adsorption equilibrium data indicates the non-uniform distribution of adsorbed sites on the surface of modified 13X zeolite. When the initial adsorption amount is 0.10mg / g, the isothermal adsorption maximum value is 17.81353kJ / mol, ie, the equivalent adsorption heat does not exceed 18kJ / mol. The process is physical adsorption, which facilitates the desorption of PH3 gas.