Journal
CHEMICAL ENGINEERING JOURNAL
Volume 325, Issue -, Pages 25-34Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2017.05.032
Keywords
CO2 capture; Sorption; Hydrotalcite; High temperature; Pre-combustion
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Funding
- Doctoral Program in Chemical and Biological Engineering from the Faculty of Engineering of University of Porto [PD/BD/52625/2014]
- Portuguese Foundation for Science and Technology (FCT) [PD/BD/52625/2014]
- Fundo Europeu de Desenvolvimento Regional (FEDER) through the Programa Operacional Regional do Norte (NORTE) [NORTE-01-0145-FEDER-000005 - LEPABE-2-ECO-INNOVATION]
- FCT I.P
- FCT [SFRH/BPD/88444/2012]
- European Social Fund (ESF)
- Human Potential Operational Program (POPH)
- Fundação para a Ciência e a Tecnologia [PD/BD/52625/2014] Funding Source: FCT
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Hydrotalcite-like materials were prepared by the co-precipitation method, characterized by PXRD, FTIR, physical adsorption of N-2 at 77 K and SEM/EDS, and after calcination they were tested for CO2 sorption at 573 K under dry conditions. The simultaneous effect of aluminum partial substitution with gallium, microwave aging of the precipitated gel and modification with potassium on their sorption capacity was assessed. Sorption isotherms were well described by the Freundlich model for all samples. A remarkable sorption capacity of 2.09 mol/kg at 3.10 bar was obtained for the Ga-containing sample, aged under microwave irradiation and impregnated with 20 wt% of potassium. The sorption kinetics was analyzed from uptake measurements and two distinct contributions (related to fast and slow uptakes), which are considered by the proposed model, were observed. Despite the slower sorption kinetics on the potassium-modified samples, they showed sorption capacities considerably higher than those reported in the literature for commercial hydrotalcites under similar conditions, even for prolonged exposition to CO2. (C) 2017 Elsevier B.V. All rights reserved.
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