Abstract: The present invention relates to the use of Layered Double Hydroxides (LDH) for synthesizing cobaltites, in particular Ca3Co4O9. The invention also relates to a thermoelectric material comprising Ca3Co4O9 as obtained from a LDH precursor.

Abstract: A method for separating the gaseous CO2 contained in a gas mixture, includes: the step of suspending in a liquid phase a solid absorbent capable of trapping the gaseous CO2; the step of dispersing the gas mixture into the liquid phase, the step being carried out at a temperature ranging from the liquid phase solidification temperature to the evaporation temperature, with the limits excluded, and under a pressure ranging from the atmospheric pressure to 10 bars, with the limits included.

Abstract: A method of separating/purifying a gas mixture (M), includes a step consisting in capturing at least one gas which can generate anionic species by dissolution in aqueous phase. The invention is characterised in that it also includes the following steps consisting in: suspending an absorbent product in the aforementioned aqueous phase, the absorbent product consisting of a lamellar double hydroxide or a mixed oxide which is believed to be amorphous and which originates from the moderate heat treatment of lamellar double hydroxides having an affinity for the above-mentioned gas; distributing the gas mixture (M) in the aqueous phase; and recovering the adsorbate from the absorbent product in suspension.