Na2CO3-doped CaO-based high-temperature CO2 sorbent and its sorption kinetics
| Autor: | Hyung Jin Yoon, Seung Wan Choi, Hyuk Jae Kwon, Chan Hyun Lee, Sang Goo Jeon, Hyun Chul Lee, Ki Bong Lee |
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| Rok vydání: | 2018 |
| Předmět: |
Thermogravimetric analysis
Sorbent Materials science Precipitation (chemistry) General Chemical Engineering Sintering Sorption 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Alkali metal 01 natural sciences Industrial and Manufacturing Engineering 0104 chemical sciences chemistry.chemical_compound Double salt chemistry Chemical engineering Environmental Chemistry 0210 nano-technology Sodium carbonate |
| Zdroj: | Chemical Engineering Journal. 352:103-109 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2018.06.141 |
| Popis: | CaO-based sorbents have received much research attention for high-temperature CO2 capture because of their high theoretical sorption capacities. However, harsh conditions are needed to regenerate CaO-based sorbents, and their high CO2 sorption capacities diminish significantly in cyclic sorption procedures owing to thermal sintering effects. To solve these problems, dopant components have been applied to CaO-based sorbents. In this study, a new CaO-based sorbent containing Na2CO3 was synthesized using a precipitation method. The prepared sorbent (Na2CO3-CaO) was characterized using various analytic methods, and its CO2 sorption performance was studied using thermogravimetric analysis. Na2CO3-CaO showed high CO2 affinity above 600 °C, and its sorption/regeneration kinetics were faster than those of the conventional CaO sorbent. To investigate the CO2 sorption mechanism onto Na2CO3-CaO, the change in crystalline structure with respect to temperature was analyzed using in-situ X-ray diffraction; the results revealed that the double salt Na2Ca(CO3)2 was generated from the reaction of CO2 with CaO and Na2CO3. Kinetic models were also developed to describe the CO2 sorption behavior of Na2CO3-CaO. The results of this study advance our understanding of the effect of alkali metal carbonates on CaO-based sorbents. |
| Databáze: | OpenAIRE |
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