2026-05-30T02:52:19Zhttps://riuma.uma.es/rest/oai/requestoai:riuma.uma.es:10630/280302026-02-03T11:04:17Zcom_10630_2254col_10630_37953
RIUMA. Repositorio Institucional de la Universidad de Málaga
author
Silva De Moura, Pedro Augusto
author
Ferracine, E.D.S.
author
Rodríguez-Aguado, Elena
author
Maia, D.A.S
author
Melo, D.C.
author
Valencia, S.
author
Cardoso, D.
author
Rey, F.
author
Bastos-Neto, Moises
author
Rodríguez-Castellón, Enrique
author
De Azevedo, Diana Cristina Silva
2023-11-15T09:50:45Z
2023-11-15T09:50:45Z
2023-10-17
Moura, P. A. S., Da Silva Ferracine, E. D., Rodríguez‐Aguado, E., Maia, D. A. S., De Melo, D. C., Valencia, S., Cardoso, D., Rey, F., Bastos-Neto, M., Rodríguez‐Castellón, E., & Azevedo, D. C. S. (2024). Assessment of the stability of LTA zeolites under natural gas drying TSA conditions. Catalysis Today, 427, 114410. https://doi.org/10.1016/j.cattod.2023.114410
https://hdl.handle.net/10630/28030
10.1016/j.cattod.2023.114410
The main features in cationic LTA zeolites that are likely to impact its potential hydrothermal stability are interconnected. The Al content and the compensating cation play an important role in the water adsorption but their influence on the zeolite performance in thermal cycles is yet to be understood. In this study, four LTA zeolite samples were synthetized with distinct Si/Al ratios in sodium and potassium forms. They underwent a Premature Aging Protocol (PAP) that took into account the operating conditions typically found in temperature swing adsorption processes. The Si/Al ratio per se did not impact in the crystallinity upon aging, but the presence of a high amount of potassium cations (Si/Al = 1) led to the amorphization of the zeolite structure. The results from XPS and NMR techniques indicate the Al migration from the outer surface to the inner cages occurs upon aging. Chemical analysis by XRF and ICP-OES associated with 27Al NMR analysis reveal that the presence of EFAl is particularly significant in the sample with the largest Si/Al ratio (5) and is correlated to a much larger C deposition upon aging. TG/DTG and TPD-NH3 experiments suggest that acid sites in the zeolite structures act as a double-edged sword, by enhancing water adsorption while also leading to carbon accumulation. CO2 isotherms at 0 ºC reveal the reduction of the microporosity after aging, whereas the Al content is proportional to the water adsorption uptake, particularly at low pressures (below 10 mbar). The material with an intermediate Si/Al ratio and in Na-form (LTAc-SiAl2-Na) combines excellent hydrothermal stability with a high-water affinity and uptake.
eng
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Zeolitas
Gas natural
Assessment of the stability of LTA zeolites under natural gas drying TSA conditions.
journal article
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