Journal
CHEMICAL ENGINEERING JOURNAL
Volume 427, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.131502
Keywords
Hydrotalcite; CO2 capture; Alkali metal impregnation; Kinetics; Cyclic operation
Categories
Funding
- Laboratory for Process Engineering, Environment, Biotechnology and Energy - LEPABE - national funds through FCT/MCTES (PIDDAC) [UIDB/00511/2020]
- FEDER funds through COMPETE2020 - Programa Operacional Competitividade e Internacionalizacao (POCI) [POCI-01-0145-FEDER-030277]
- national funds (PIDDAC) through FCT/MCTES
- Portuguese Foundation for Science and Technology (FCT) - national funds of the Ministry of Science, Technology and Higher Education [SFRH/BD/136698/2018]
- European Social Fund (ESF) through the Human Capital Operational Programme (POCH)
- Fundação para a Ciência e a Tecnologia [SFRH/BD/136698/2018] Funding Source: FCT
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This study aims to find a CO2 HT-based sorbent with promising behavior in terms of sorption capacity, sorption kinetics, and cyclic stability during continuous sorption/desorption cycles. The best performance was observed for CHT doped with 9.4 wt% of Cs. A study on the cyclic stability of this material was conducted, and a kinetic model predicting the loss of sorption capacity with cycles was successfully developed.
A hydrotalcite (HT) with a Mg2+/Al3+ molar ratio of 2 was prepared and promoted with different loadings of Na and Cs. After calcination (denoted as CHT), the samples were tested for CO2 sorption at 573 K and 0.15eg bar of CO2 (typical of flue gas). Their performance was compared to that achieved with a commercial HT, MG63, and with a K-doped material for which a significant increase of CO2 sorption capacity has been frequently reported in the literature. However, the presence of K slows down the sorption kinetics, which might compromise the cyclic separation process productivity. In this work, it is aimed to find out a CO2 HT-based sorbent with promising behaviour during continuous sorption/desorption cycles, in terms of sorption capacity, sorption kinetics and cyclic stability. The best compromise was observed for a CHT doped with 9.4 wt% of Cs. A study of the cyclic stability of this material was performed and a kinetic model that can predict the loss of sorption capacity with cycles has been successfully developed. The performance of this sorbent was further investigated in a scenario where other species found in flue gas streams (i.e. O-2, H2O and/or CO) are also present.
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