Adsorption of CO2 on Hydrotalcite-Derived Mixed Oxides: Sorption Mechanisms and Consequences for Adsorption Irreversibility
By M. León, E. Díaz, S. Bennici, A. Vega, S. Ordóñez, A. Auroux. 2010
202 citations recorded by the source corpus.
Magnesium−aluminum double oxides derived from the thermal treatment of layered hydroxides (hydrotalcites) have been tested for CO2 adsorption. The effects of various preparation parameters, such as the incorporated cation (K or Na), the mode of addition of magnesium and aluminum precursors, the presence of sonication, and the calcination temperature, on the adsorption capacity under mild conditions were studied using thermogravimetry and calorimetry. Calorimetric and FTIR data were used to explain the adsorption mechanisms leading to the undesirable irreversible adsorption. This adsorption was related to the formation of unidentate CO2-adsorbent species with the strongest adsorption sites, whereas bidentate and surface bicarbonates lead to highly reversible adsorption. In conclusion, preparation procedures that lead to an increase in the strength of basic sites do not lead to significant increases in the adsorption capacity, but rather lead to more difficult regeneration of the saturated support.
Subfields: Materials Chemistry, Mechanical Engineering
View Paper: https://www.semanticscholar.org/paper/dc7c824e2d19e2af816cc2846193d359f932c9b4
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Materials Chemistry
In Mechanical Engineering
Citations in the corpus
- Hydrogen production from catalytic steam reforming of biodiesel byproduct glycerol: Issues and challenges (2014, background): “The inconsistency observed in the illustration of the CO2 sorption over hydrotalcite may principally be due to the large span of its composition, nature, preparation methods, promoter types and impregnation degree, reaction temperature and pressure range [87,96].”
- MgO content of slag controls phase evolution and structural changes induced by accelerated carbonation in alkali-activated binders (2014, unknown): “Layered double hydrotalcitelike compounds are used to capture CO2 from industrial gas streams, as the excess positive charge of the brucite-like layers forming these compounds is compensated by CO3 anions in the interlayer space where water molecules are usually present [51].”
- An in-situ IR study on the adsorption of CO2 and H2O on hydrotalcites (2018, background): “The band CO2 at 1060 cm becomes slightly IR-active upon CO2 adsorption for various carbonate species as unidentate and bidentate [23,30].”