Thermodynamics and kinetics of n-heptane and methyl cyclohexane adsorption by UiO-66 with hierarchical pores

被引：0
|
作者：
Zhang Z. [1 ]
Chen S.-J. [1 ]
Zhang L. [1 ]
Qian G. [1 ]
Liu Z.-J. [1 ]
Sun Z.-C. [1 ]
Cui Q. [1 ]
Wang H.-Y. [1 ]
机构：
[1] College of Chemical Engineering, Nanjing Tech University, Nanjing
来源：
Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities | 2019年 / 33卷 / 04期
关键词：
Adsorption heat; Diffusion coefficients; Hierarchical pores UiO-66; Methyl cyclohexane; N-heptane;
D O I：
10.3969/j.issn.1003-9015.2019.04.021
中图分类号：
学科分类号：
摘要：
UiO-66 with hierarchical pores was synthesized through a soft template method. Adsorption/desorption isotherms and rates of n-heptane (nHEP) and methyl cyclohexane (MCH) on UiO-66 with hierarchical pores and UiO-66 were measured at 50~150 ℃. Effects of mesoporous structure on equilibrium‬ adsorption/desorption performance of n-HEP and MCH were studied. The results show that adsorption isotherms of n-HEP and MCH on UiO-66 and UiO-66 with hierarchical pores are of type I, and the adsorption isotherm degree reduces gradually with the increase of adsorption temperature. The ratio of equilibrium adsorption capacity between MCH and nHEP on UiO-66 with hierarchical pores is 2.93, which is higher than that of UiO-66 (1.32). Characteristic adsorption energy of nHEP on UiO-66 hierarchical pores is about 20% lower than that of UiO-66. Isosteric adsorption heats of nHEP and MCH on UiO-66 with hierarchical pores are about 20% lower than that of UiO-66. Effective adsorption/desorption diffusion coefficients of nHEP and MCH on UiO-66 with hierarchical pores are 10 times larger than that of UiO-66. The introduction of hierarchical structure reduces adsorption forces between UiO-66 surface and nHEP/MCH, and dramatically strengthens mass transfer process, which is beneficial for the desorption of nHEP/MCH on UiO-66. Efficiency of adsorption separation of nHEP from No.120 solvent oil is improved. © 2019, Editorial Board of "Journal of Chemical Engineering of Chinese Universities". All right reserved.
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页码：942 / 950
页数：8
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