Chemically activated microporous carbons derived from petroleum coke: Performance evaluation for CF4 adsorption
| Autor: | Eunji Jang, Seung Wan Choi, Ki Bong Lee, Xiangzhou Yuan |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Carbonization
General Chemical Engineering Petroleum coke Langmuir adsorption model chemistry.chemical_element 02 engineering and technology General Chemistry Microporous material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Industrial and Manufacturing Engineering 0104 chemical sciences symbols.namesake Adsorption Physisorption chemistry Chemical engineering symbols Environmental Chemistry Organic chemistry 0210 nano-technology Selectivity Carbon |
| Zdroj: | Chemical Engineering Journal. 336:297-305 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2017.11.168 |
| Popis: | CF 4 is considered to be a significant global-warming compound and has a fairly long atmospheric lifetime, which exacerbates climate change. Adsorption is considered a promising technology for capturing CF 4 and appropriate adsorbent is one of key factors for successful development of adsorption method. In this study, CF 4 adsorption using microporous carbon materials was investigated from both equilibrium and kinetic perspectives. Petroleum coke (PC) was utilized for developing CF 4 adsorbents by carbonization and KOH-activation processes. The carbonization temperature and KOH/PC mass ratio were varied from 300 to 600 °C and from 1 to 3, respectively. Varying the carbonization temperature and KOH/PC mass ratio had a dramatic effect on the textual properties of the prepared samples. CF 4 adsorption was well fitted by the Langmuir isotherm model, and the CF 4 uptake was remarkably dominated by the surface area and pore volume of narrow micropores below 0.8 nm in diameter. The experimental CF 4 adsorption data were well described by the pseudo-second-order kinetic model, compared with the Elovich and intra-particle-diffusion models, and CF 4 adsorption appeared to be mainly controlled by physisorption. The PC450-K2 adsorbent, prepared using a carbonization temperature of 450 °C and a KOH/PC mass ratio of 2, exhibited the highest CF 4 adsorption uptake of 2.79 mol kg −1 at 25 °C and 1 atm, in addition to good CF 4 /N 2 selectivity at relatively low CF 4 pressures, excellent recyclability, easy regeneration, and rapid adsorption-desorption kinetics. |
| Databáze: | OpenAIRE |
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