Adsorption kinetics of water vapor on hypercrosslinked polymeric adsorbent and its comparison with carbonaceous adsorbents
| Autor: | Lijuan Jia, Yao Xiaohong, Jiakai Ma, Chao Long |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Thermogravimetric analysis
Chemistry Diffusion 02 engineering and technology General Chemistry Activation energy 010501 environmental sciences 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences law.invention Adsorption Magazine Chemical engineering Mechanics of Materials law medicine Organic chemistry General Materials Science Fiber 0210 nano-technology Water vapor 0105 earth and related environmental sciences Activated carbon medicine.drug |
| Zdroj: | Microporous and Mesoporous Materials. 241:178-184 |
| ISSN: | 1387-1811 |
| DOI: | 10.1016/j.micromeso.2016.12.028 |
| Popis: | In the removal of volatile organic compounds (VOCs) from gas, the unavoidable presence of water can degrade the performance of adsorbent because water competes well with VOCs. In this study, the adsorption kinetic behavior of water vapor on hypercrosslinked polymeric adsorbent (HPA) at three temperatures (308 K, 318 K and 328 K) was studied through thermogravimetric analysis (TGA), and compared with granular activated carbon (GAC) and activated carbon fiber (ACF). The results showed that the kinetic rate constants decreased with the increase of relative pressure, but increased with the increase of temperature for three adsorbents. Under the same condition, the kinetic rate constants were as following: HPA > ACF > GAC, which was just opposite with the concentration of surface functional groups. Activation energies were found to increase with the increase of relative pressure, indicating the development of barriers to diffusion associated with the formation of water clusters. A compensation effect was observed, where activation energy and ln(preexponential factor) parameter exhibited a linear correlation. |
| Databáze: | OpenAIRE |
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