Doping of hydrotalcite-based sorbents with different interlayer anions for CO2 capture

• Type: Article in International Scientific Journal
• Date: 2020

Authors

Cláudio Rocha (Author) FEUP; Miguel A. Soria (Author) FEUP; Luís Madeira (Author) FEUP

Journal

Title: Separation and Purification Technology

Vol. 235

Pages: 1-12

ISSN: 1383-5866

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 15 Citations

ISI Web of Science

Scopus - 15 Citations

Associated Projects

LEPABE-2-ECO-INNOVATION - LEPABE-2-ECO-INNOVATION

Other information

Authenticus ID: P-00R-50X

DOI: 10.1016/j.seppur.2019.116140

Abstract (EN): 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 12