低浓度萘在SBA-15上吸附等温线推算

发布时间：2018-03-16 09:33

本文选题：萘　切入点：吸附等温线　出处：《工程科学学报》2016年06期 　论文类型：期刊论文

【摘要】：为了获取低挥发性有机物的吸附等温线,基于Langmuir方程,提出一种推算低浓度低挥发性有机物的吸附等温线的方法.脱附活化能由改进的程序升温脱附模型进行动力学分析获得,由此获得的Langmuir方程中的平衡常数B,较经典程序升温脱附模型求算值更接近本征值,且不受是否发生再吸附现象影响;饱和吸附量可结合吸附剂表征结果可得到.此方法应用于低浓度萘在SBA-15上的吸附等温线的推算,脱附活化能为58.37 k J·mol~(-1),平衡常数为0.01149 Pa~(-1),饱和吸附量为55.11 mg·g~(-1),相对误差约5%,与实验值较好吻合.
[Abstract]:In order to obtain the adsorption isotherm of low volatile organic compounds (LVOCs), a method for calculating the adsorption isotherms of LVOCs was proposed based on Langmuir equation. The desorption activation energy was obtained by the kinetic analysis of the modified temperature programmed desorption model. The obtained equilibrium constant B in the Langmuir equation is closer to the eigenvalue than the classical temperature programmed desorption model and is not affected by the phenomenon of readsorption. This method can be used to calculate the adsorption isotherms of low concentration naphthalene on SBA-15. The desorption activation energy is 58.37 kJ 路mol ~ (-1) ~ (-1), the equilibrium constant is 0.01149 Pa ~ (-1) ~ (-1), the saturated adsorption capacity is 55.11 mg 路g ~ (-1) ~ (-1), and the relative error is about 5%, which is in good agreement with the experimental data.
【作者单位】：北京科技大学机械工程学院;北京科技大学北京高校节能与环保工程研究中心;
【基金】：国家自然科学基金资助项目(51478038)
【分类号】：O647.31

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