Citation: YUE Xu, WANG Sheng, GAO Yang, LIU Xu, LI De-yi, WANG Jian-cheng, HAO Bing-yuan, WANG Shu-dong. Thermodynamics analysis on the adsorption behaviors of VOCs on various adsorbents[J]. Journal of Fuel Chemistry and Technology, ;2020, 48(6): 752-760. shu

Thermodynamics analysis on the adsorption behaviors of VOCs on various adsorbents

YUE Xu ^1,2 ,
WANG Sheng ^1,, ,
GAO Yang ¹ ,
LIU Xu ¹ ,
LI De-yi ¹ ,
WANG Jian-cheng ³ ,
HAO Bing-yuan ² ,
WANG Shu-dong ¹

1.
Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
2.
College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
3.
Key Laboratory of Coal Science and Technology, Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, China

Corresponding author: WANG Sheng, wangsheng@dicp.ac.cn
Received Date: 13 January 2020
Revised Date: 22 May 2020

Fund Project: Dalian Institute of Chemical Physics DICP I201937The project was supported by the National Key Research and Development Program of China 2016YFC0204302The project was supported by The project was supported by the National Key Research and Development Program of China (2016YFC0204302), National Natural Science Foundation of China (21676267) and Dalian Institute of Chemical Physics (DICP I201937)National Natural Science Foundation of China 21676267

Figures(6)

The adsorption and desorption behaviors of n-hexane, toluene and ethyl acetate on activated carbon, 5A, NaY, 13X, ZSM-5 (SiO₂/Al₂O₃=27, 300), Hβ and MCM-41 at different temperatures were investigated by chromatography method and thermogravimetry (TG).And the adsorption thermodynamic parameters (ΔH, ΔS and ΔG) were calculated based on the results obtained by inverse gas chromatography, by which, the interactions between adsorbent and VOC molecules were elucidated. In addition, the adsorption mechanisms of VOC molecules on molecular sieves were confirmed based on FT-IR results. There are two modes of spontaneous adsorption involving physical and chemical adsorptions. The physical adsorption strength is dependent on the pore size distribution of the adsorbent and the molecular diameter of the adsorbate, while the chemical adsorption strength is associated with the Si/Al ratio of the molecular sieve, the cations of Ca²⁺, Na⁺, H⁺, and the dipole moment of the adsorbate molecules. Meanwhile, the presence of strong chemical adsorption makes desorption temperature up to 200℃.
- desorption temperature,
- VOCs,
- inverse gas chromatography,
- adsorption thermodynamics
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