The effects of high-pressure on the chemisorption process of CO2 on lithium oxosilicate (Li8SiO6)
| Autor: | Pablo R. Díaz-Herrera, Margarita J. Ramírez-Moreno, Heriberto Pfeiffer |
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| Rok vydání: | 2015 |
| Předmět: |
Chemistry
General Chemical Engineering Inorganic chemistry Shell (structure) chemistry.chemical_element Sorption General Chemistry Industrial and Manufacturing Engineering Adsorption Chemical engineering Volume (thermodynamics) Chemisorption Scientific method High pressure Environmental Chemistry Lithium |
| Zdroj: | Chemical Engineering Journal. 264:10-15 |
| ISSN: | 1385-8947 |
| Popis: | High-pressure CO 2 capture was evaluated on Li 8 SiO 6 . Several different high-pressure experiments were performed using CO 2 , and the sample products were analyzed using XRD, N 2 adsorption, SEM and DSC. The results clearly showed that CO 2 is chemically and physically trapped and that the CO 2 chemisorption improved as a function of temperature. Depending on the temperature, Li 8 SiO 6 reacted with 2 mol or less of CO 2 to produce an external shell composed of Li 4 SiO 4 , Li 2 CO 3 and Li 2 O in a non-stoichiometric reaction. Independently of the external shell composition, the final surface area and pore volume increased independent of the external shell composition and favored the second sorption process: CO 2 adsorption. Therefore, high pressures enhance CO 2 capture between 30 and 350 °C, promoting the chemisorption and adsorption processes. |
| Databáze: | OpenAIRE |
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