A carbon dioxide (CO.sub.2) capture system to reduce CO.sub.2 emissions comprises an absorption zone and a regeneration zone. The absorption zone captures CO.sub.2 from exhaust gas by absorption in a liquid solvent separated from the exhaust gas by a separator. The liquid solvent comprises a blend of alkali metal salts of two or more amino or amino-sulfonic acids, thereby forming a first constituent and a second constituent. The first constituent is a primary or secondary amino or amino sulfonic acid with molar mass of less than 200 g/mol. The second constituent has a molar mass of less than 300 g/mol. The regeneration zone may rejuvenate the liquid solvent rich in captured CO.sub.2 by heating so that a resulting liquid solvent with a low concentration of CO.sub.2 is pumped back to the absorption zone. An on-board CO.sub.2 capture and storage system for a mobile internal combustion engine and a method for capturing CO.sub.2 are also described.

In a general aspect, interfacial surface structures for removing carbon dioxide from a gaseous feed are presented. In some cases, a method of removing carbon dioxide gas from a gaseous feed includes wetting surfaces of an interfacial surface structure in a gas-liquid contactor with an alkaline capture solution. The gaseous feed containing the CO.sub.2 gas is passed across the wetted surfaces of the interfacial surface structure to dissolve the CO.sub.2 gas in the alkaline capture solution. A CO.sub.2-rich alkaline capture solution is collected from the gas-liquid contactor. The CO.sub.2-rich alkaline capture solution includes dissolved CO.sub.2 gas from the gaseous feed.

In a general aspect, interfacial surface structures for removing carbon dioxide from a gaseous feed are presented. In some cases, a method of removing carbon dioxide gas from a gaseous feed includes wetting surfaces of an interfacial surface structure in a gas-liquid contactor with an alkaline capture solution. The gaseous feed containing the CO.sub.2 gas is passed across the wetted surfaces of the interfacial surface structure to dissolve the CO.sub.2 gas in the alkaline capture solution. A CO.sub.2-rich alkaline capture solution is collected from the gas-liquid contactor. The CO.sub.2-rich alkaline capture solution includes dissolved CO.sub.2 gas from the gaseous feed.

A method for regenerating an amine-containing sorbent useful in the capture of carbon dioxide (CO.sub.2), by contacting a CO.sub.2 complex of the amine-containing sorbent in solution with a metal oxide material while the solution is at a temperature within a range of 60-130 C. to result in release of CO.sub.2 and regeneration of the amine-containing sorbent, wherein the CO.sub.2 in the CO.sub.2 complex is in the form of a carbamate or bicarbonate moiety attached to the amine-containing sorbent. The method may also include re-using the regenerated sorbent to capture carbon dioxide. The sorbent may be, for example, an amino acid (e.g., glycine), alkylamine, alkanolamine, or amine biphasic solvent. The metal oxide material may more particularly be selected from the group consisting of TiO.sub.2, TiO(OH).sub.2, MoO.sub.3, V.sub.2O.sub.5, Cr.sub.2O.sub.3, WO.sub.3, Ag.sub.2O, Nb.sub.2O.sub.5, NiO, CuO, MnO.sub.2, ZrO.sub.2, Fe.sub.2O.sub.3, Fe.sub.3O.sub.4, ZnO, and combinations thereof.

The present disclosure provides an apparatus for managing CO.sub.2 removal from an environment can include an air inlet that can receive an airflow having an initial amount of CO.sub.2 molecules, a liquid solution that can absorb CO.sub.2 molecules from the airflow and reduce the initial amount of the CO.sub.2 molecules, a reservoir that can receive the liquid solution, a pump in fluid communication with the reservoir that can provide pressure to receive the liquid solution from the reservoir, a pipe in fluid communication with the pump that can move the liquid solution from the pump to a plurality of openings for the liquid solution to contact the airflow, and an air outlet that can discharge the airflow having the reduced amount of the CO.sub.2 molecules.

The present disclosure provides a carbon dioxide absorption composition, which includes a solution of an amino compound in a solvent comprising water and a glycol, as well as a method of using such composition to capture CO.sub.2. The present composition can be particularly advantageous for indoor use, with additional benefit for managing total volatile organic compounds and humidity to enhance overall indoor air quality.

Method for trapping and storing CO.sub.2 by mechanochemical route including: a) dissolving an amine or amino acid to obtain a concentrated solution whose concentration of amine function is at least 3M; b) bringing the solution into contact with a CO.sub.2-containing gas; c)1. bringing into contact under stirring the solution with an oxide, hydroxide, silicate, aluminate, phosphate, chloride or sulfate of alkaline earth metal or a material containing an oxide, silicate, aluminate, phosphate, chloride or sulfate of alkaline earth metal, the energy implemented for stirring being at least 2.5 W per gram; or 2. bringing into contact under grinding the precipitate with an oxide, hydroxide, silicate, aluminate, phosphate, chloride or sulfate of alkaline earth metal or a material containing an oxide, silicate, aluminate, phosphate, chloride or sulfate of alkaline earth metal, the energy implemented for grinding being at least 2.5 W per gram; and d) washing the obtained solid.

A compound having the following structure:

##STR00001##

wherein: R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7, R.sup.8, R.sup.9, and R.sup.10 are independently selected from (i) hydrogen atom (H), (ii) alkyl groups (R) containing 1-3 carbon atoms and optionally substituted with one or more fluorine atoms, (iii) (CH.sub.2).sub.n(OCH.sub.2CH.sub.2).sub.mX groups, (iv) OR groups, (v) NR.sub.2 groups, (vi) NHC(O)R, (vii) C(O)R groups, (viii) halogen atoms, (ix) NO.sub.2 groups, and (x) CN groups, wherein R groups are independently selected from hydrogen atom (H); alkyl groups (R) containing 1-3 carbon atoms; and groups of the formula (CH.sub.2).sub.n(OCH.sub.2CH.sub.2).sub.mX, wherein n is 0 or an integer of 1-3, m is 0 or an integer of 1-12, and X is H, OH, OCH.sub.3, or OCH.sub.2CH.sub.3. Also described herein are methods for selectively capturing carbon dioxide (CO.sub.2) from a liquid source by use of the above compound.