期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 235, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2019.116140
关键词
Hydrotalcites; CO2 sorption; Potassium impregnation; Gallium substitution; Doped hydrotalcites
资金
- Faculty of Engineering of the University of Porto, Portugal
- Portuguese Foundation for Science and Technology (FCT) [PD/BD/120179/2016]
- Fundo Europeu de Desenvolvimento Regional (FEDER) through the Programa Operational Regional do Norte (NORTE 2020) [NORTE-01-0145-FEDER-000005 - LEPABE-2-ECO-INNOVATION]
- national funds through the FCT I.P.
Hydrotalcites (HTCs) with a molar ratio Mg2+/Al3+ = 2 or Mg2+/(Al3+ + Ga3+) = 2 and (Al3+/Ga3+ = 9) were synthesized using a co-precipitation method with two different interlayer anions: carbonate (CO32-) and triacetoxyborohydride ((CH3COO)(3)BH-). The simultaneous effect of aluminum partial substitution with gallium and impregnation with potassium on their CO2 sorption capacity was assessed. The physicochemical characterization of the sorbents was performed through different techniques (TGA-DTG, FTIR, XRD, SEM/EDS and AAS). The CO2 sorption equilibrium isotherms at 300 degrees C were determined for all the calcined sorbents and CO2 breakthrough runs carried out. Sorption isotherms under dry conditions were well described by the Freundlich model for all samples. The results indicate that the doping of HTCs with potassium greatly enhanced the sorption capacity when compared with the original materials. It was seen in the dynamic tests that steam affects negatively the sorption performance of the HTCs prepared with the compensating anion (CH3COO)(3)BH-, in opposition to what happens with the HTCs containing the CO32- anion.
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