The present disclosure is directed to the integration of direct air capture of carbon dioxide with thermochemical water splitting, the latter optionally driven by solar energy. The disclosure is also directed to a process comprising extracting carbon dioxide from an air stream by contacting the air-stream with an alkali metal ion-transition metal oxide of empirical formula A.sub.xMO.sub.2 (0.1<x≤1), where A represents the alkali metal ion comprising sodium ion, potassium ion, or a combination thereof and M comprises iron, manganese, or a combination thereof to form a transition metal composition comprising an oxidized ion extracted-transition metal oxide.

The present disclosure relates to an apparatus, system and method for selectively capturing a carbon-containing gas from an input gas mixture.

A system for capturing and sequestering carbon dioxide includes nanoparticles formed from alkali or alkali metal oxides or hydroxides, such as lithium oxide. Carbon-dioxide containing effluent gasses are exposed to the nanoparticles in fixed beds or fluidized beds, or in a co-flow configuration. The nanoparticle metal oxides are converted to metal carbonates. The nanoparticles can be recovered and the carbon dioxide release by exposing the nanoparticles to an oxygen containing atmosphere at high temperatures.

Some embodiments of the present disclosure relate to a method of regenerating at least one filter medium comprising: providing at least one filter medium, wherein the at least one filter medium comprises: at least one catalyst material; and ammonium bisulfate (ABS) deposits, ammonium sulfate (AS) deposits, or any combination thereof; flowing a flue gas stream transverse to a cross-section of a filter medium, such that the flue gas stream passes through the cross section of the at least one filter medium, wherein the flue gas stream comprises: NOx compounds comprising: Nitric Oxide (NO), and Nitrogen Dioxide (NO.sub.2); and increasing an NOx removal efficiency of the at least one filter medium after removal of deposits.

There is provided a system for energy storage and CO.sub.2 capture. The system comprises CaO/CaCO.sub.3, a carbonator (1) adapted to react CaO with CO.sub.2 to produce CaCO.sub.3, at least one CaCO.sub.3 storage container (2) for receiving and storing the CaCO.sub.3 produced in the carbonator (1), wherein the CaCO.sub.3 storage container (2) is configured to be transportable such that the CaCO.sub.3 can be supplied to a geographical location (3) remote from the carbonator (1) for CO.sub.2 release.

A method of exhaust gas scrubbing includes providing recycled concrete fines as a waste material rich in carbonatable Ca and/or Mg phases and with d.sub.90≤1000 μm and a Rosin-Rammler slope n from 0.6 to 1.4 , injecting the waste material into an exhaust gas stream containing CO.sub.2 and/or SO.sub.x for reaction with CO.sub.2 and/or SO.sub.x at a relative humidity of 50 to 100 Vol.-% and a temperature from 40 to 130° C. in an amount of dry waste material ranging from 5 to 30 kg/m.sup.3, withdrawing a partly carbonated and/or sulphurized waste material and purified exhaust gas, and recycling a part of the partly carbonated and sulphurized waste material while the remainder is discharged, as well as use of a waste material slurry for exhaust gas cleaning of CO.sub.2 and/or SO.sub.x.

Methods and systems for gas separation of syngas applying differences in water solubilities of syngas components, the method including producing a product gas comprising hydrogen and carbon dioxide from a hydrocarbon fuel source; separating hydrogen from the product gas to create a hydrogen product stream and a byproduct stream by solubilizing components in water that are more soluble in water than hydrogen; injecting the byproduct stream into a reservoir containing mafic rock; and allowing components of the byproduct stream to react in situ with components of the mafic rock to precipitate and store components of the byproduct stream in the reservoir.

A method of storing energy is disclosed. The method comprises heating a material that comprises a CO.sub.2 sorbed product and an additive to desorb CO.sub.2 from the material and to convert the CO.sub.2 sorbed product to a CO.sub.2 sorbent. The additive is selected such that it at least partially prevents during heating (i) sintering of the CO.sub.2 sorbent and/or the CO.sub.2 sorbed product; and (ii) the formation of a crust on the material, the crust minimising or preventing the CO.sub.2 sorbent and CO2 from reacting with one another to form the CO.sub.2 sorbed product in a subsequent CO.sub.2 absorption step. Also disclosed is a composition used to sorb and desorb CO.sub.2 in a thermal battery, and a system for implementing the method, the system using the composition.

A desulfurizer material for desulfurizing fuel supplied to a fuel cell system, the desulfurizer material comprising one or more manganese oxide materials having an octahedral molecular sieve (OMS) structure, and the desulfurizer material being resistant to moisture and being capable of removing organic sulfur containing compounds and H.sub.2S. The desulfurizer material is used in a desulfurizer assembly which is used as part of a fuel cell system.

Provided is an adsorbent for capturing carbon dioxide and a method for manufacturing same, and more particularly, to an adsorbent for capturing carbon dioxide, including a magnesium oxide/titanium dioxide composite having wide surface area, large pore volume and good CO.sub.2 adsorption performance, and a method for manufacturing same. According to the present invention, a novel MgO based composite metal oxide which may stably adsorb CO.sub.2 at a low temperature such as room temperature is provided. The adsorbent for capturing carbon dioxide, including a magnesium oxide/titanium dioxide composite has good thermal stability, and controls basic sites easily, and is used in various fields for capturing carbon dioxide. In addition, by controlling the molar ratio of the metal ions of the magnesium oxide/titanium dioxide composite and controlling morphology, an adsorbent for capturing carbon dioxide having large surface area and pore volume and strong basic sites may be provided.