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Zeolites synthesis from phyllosilicates and their performance for CO2 adsorption Es Sih, Salima Vilarrasa García, Enrique De Azevedo, Diana Cristina Silva Ballesteros-Plata, Daniel Barroso-Martín, Isabel Infantes-Molina, Antonia Rodríguez-Castellón, Enrique Franco-Duro, Francisco Ignacio Cecilia-Buenestado, Juan Antonio Zeolitas Filosilicatos Dióxido de carbono - Absorción y adsorción Five phyllosilicates (kaolinite, montmorillonite, saponite, sepiolite and palygorskite) have been selected as starting materi- als for the synthesis of zeolites. Among them, kaolinite and montmorillonite display the lowest Si/Al molar ratio leading to aluminosilicates with high crystallinity. Thus, the hydrothermal treatment under basic conditions forms 4A zeolite when kaolinite is used as starting material while 13X zeolite is obtained when montmorillonite is used as starting material. The microporosity and CO 2 -adsorption capacity of the prepared zeolites are directly related to its crystallinity. Thus, in order to improve it, raw phyllosilicates were subjected to a microwave-assisted treatment to remove undesired Mg or Fe-species, which have a negative effect in the assembling of the zeolites by hydrothermal basic conditions in a second step. The high- est adsorption value was 3.85 mmol/g at 25 °C and 760 mm of Hg for Mont-A-B sample after the consecutive treatments. 2024-05-21T10:51:15Z 2024-05-21T10:51:15Z 2024-05-21T10:51:15Z 2024 journal article Essih, S., Vilarrasa-García, E., Azevedo, D.C.S. et al. Zeolites synthesis from phyllosilicates and their performance for CO2 adsorption. Environ Sci Pollut Res (2024). https://doi.org/10.1007/s11356-024-33685-0 https://hdl.handle.net/10630/31335 https://doi.org/10.1007/s11356-024-33685-0 eng http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional Springer