Provided are: a hydrocarbon adsorbent capable of adsorbing hydrocarbons, storing the adsorbed hydrocarbons up to a relatively high temperature, and desorbing the adsorbed and stored hydrocarbons at a relatively high temperature; an exhaust gas purifying catalyst composition using the same; an exhaust gas purifying catalyst; and a method for treating an exhaust gas. The hydrocarbon adsorbent comprises a zeolite having an MRT-type framework structure. The hydrocarbon adsorbent comprises a small-pore zeolite having a total desorption amount ZD.sub.1 of propylene desorbed at 50° C. or higher and lower than 300° C. being 3.5 mmol/g or less and a total desorption amount ZD.sub.2 of propylene desorbed at 300° C. or higher and 500° C. or lower being 0.5 mmol/g or more, per 1 g by mass of the small-pore zeolite, when adsorbing propylene at 50° C. and then heating from 50° C. to 500° C. under the condition of 10° C./min by a temperature-programmed desorption method.

A carbon dioxide containing fluid is flowed through a membrane in an open position. The membrane encapsulates an adsorbent bed operating at a first temperature. The adsorbent bed adsorbs at least a portion of the carbon dioxide of the carbon dioxide containing fluid. The membrane is adjusted to a closed position, thereby isolating the adsorbent bed and preventing fluid flow into and out of the membrane. The adsorbent bed is heated to a second temperature, thereby desorbing the carbon dioxide captured from the carbon dioxide containing fluid. The membrane is adjusted to the open position. The adsorbent bed is cooled to the first temperature.

Processes for regenerating sorbents at high temperatures, and associated systems, are generally described.

Hygroscopic hydrogels including a cross-linked polymer, the polymer being prepared by polymerization of one or more monomers, wherein at least one of the monomers is a compound of formula I, are provided. Related monomers and polymers, as well as methods for the production and use thereof, are also provided. Hygroscopic hydrogels as described herein may be used for water harvesting, for example. (I) (formula I)

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Disclosed are embodiments of a cabin filter system including a sorbent material for removing gas and/or water from a cabin. The filter system also includes at least one heater configured to transmit thermal energy (e.g., microwave energy) to the sorbent material. Also disclosed are methods of using such filter systems.

The present disclosure provides systems and methods for direct air capture of carbon dioxide or other gases through a calcium sorbent in a manner that allows for wide scale, relatively low cost implementation. In particular, a calcium sorbent may be provided as a substantially thin coating on one or more substrates and utilized for direct air capture of carbon dioxide through chemisorption. The carbonated sorbent may be disposed of for sequestration of the carbon dioxide or regenerated with capture of carbon dioxide released from the carbonated sorbent during the regeneration process.

Provided herein are water harvesting systems, as well as methods of making and using such systems, for capturing water from surrounding air using a design that reduces overall energy costs of the systems and improve water harvesting cycle efficiency. The systems and methods use sorbent materials, such as metal-organic frameworks, to adsorb water from the air. The systems and methods desorb this water in the form of water vapor, and the water vapor is condensed into liquid water and collected. The liquid water is suitable for use as drinking water.

The present disclosure relates to a solid adsorbent for capturing carbon dioxide (CO.sub.2) from a gas stream comprising CO.sub.2, the solid adsorbent comprising an amine covalently bonded to a polymer resin (e.g., a polystyrene resin), wherein the solid adsorbent has a CO.sub.2 uptake capacity of greater than about 7 wt. % at a temperature of about 40° C., and wherein the solid adsorbent has a CO.sub.2 uptake capacity of less than about 1.5 wt. % at a temperature of about 100° C., as measured when the gas stream further comprises a concentration of the CO.sub.2 of about 4 vol. %, by volume of the gas stream.

The present invention relates to a process for CO.sub.2 capture and production of CO. The present invention also relates to an apparatus for CO.sub.2 capture and production of CO. An object of the present invention is to provide a sustainable process for the capture CO.sub.2 and convert it into CO. Another object of the present invention is to provide a process for the direct production of valuable chemicals through capture and conversion of CO.sub.2.

An ink for three dimensional printing a ceramic material includes metal oxide nanoparticles and a polymer resin, where a concentration of the metal oxide nanoparticles is at least about 50 wt % of a total mass of the ink. A method of forming a porous ceramic material includes obtaining an ink, where the ink comprises a mixture of metal oxide nanoparticles and a polymer, forming a body from the ink, curing the formed body, heating the formed body for removing the polymer and for forming a porous ceramic material from the metal oxide nanoparticles. The forming the body includes an additive manufacturing process with the ink.