The present invention concerns the use, for gas separation, of at least one zeolite adsorbent material comprising at least one FAU zeolite, said adsorbent having an external surface area greater than 20 m.sup.2.Math.g.sup.−1, a non-zeolite phase (PNZ) content such that 0<PNZ≦30%, and an Si/Al atomic ratio of between 1 and 2.5. The invention also concerns a zeolite adsorbent material having an Si/Al ratio such that 1≦Si/Al<2.5, a mesoporous volume of between 0.08 cm.sup.3.Math.g.sup.−1 and 0.25 cm.sup.3.Math.g.sup.−1, a (Vmicro−Vmeso)/Vmicro ratio of between −0.5 and 1.0, non-inclusive, and a non-zeolite phase (PNZ) content such that 0<PNZ≦30%.

Methods of preparing and using a metal-organic framework (MOF) are provided herein, including methods of using an MOF comprising a repeat unit of the formula [ML].sub.n, wherein M is a divalent metal ion and L is a ligand of the formula: ##STR00001##
The MOFs provided herein may be used in the separation of two or more molecules from each other. In some embodiments, the molecules are ethylene and ethane. In some embodiments, UTSA-280 may be synthesized from calcium oxide (CaO) or calcium hydroxide (Ca(OH).sub.2) and squaric acid (SA) through mechanochemical synthesis.

Disclosed is an absorbent containing an amine for absorption of an acid gas in a biogas, and a biogas purification system using the same.

Disclosed is an absorbent containing an amine for absorption of an acid gas in a biogas, and a biogas purification system using the same.

In some embodiments, the present disclosure pertains to methods of capturing CO.sub.2 from an environment by hydrating a porous material with water molecules to the extent thereby to define a preselected region of a plurality of hydrated pores and yet to the extent to allow the preselected region of a plurality of pores of the porous material to uptake gas molecules; positioning the porous material within a CO.sub.2 associated environment; and capturing CO.sub.2 by the hydrated porous material. In some embodiments, the pore volume of the hydrated porous material includes between 90% and 20% of the pre-hydrated pore volume to provide unhydrated pore volume within the porous material for enhanced selective uptake of CO.sub.2 in the CO.sub.2 associated environment. In some embodiments, the step of capturing includes forming CO.sub.2-hydrates within the pores of the porous material, where the CO.sub.2.Math.n/H.sub.2O ratio is n<4.

A device 2 to remove polar molecules like water vapor from an air stream is provided herein. The device includes a non-conductive housing 4 encapsulating a chamber 5 where the chamber 5 includes a fan 6 located at one end of the chamber 5 which allows air 24 to enter into the chamber 5, at least one metallic brush 12 is located inside a chamber and mounted on a dielectric holder 14, a curved solid wall 39 integrated with the non-conductive housing 4 at one end where the curved solid wall 39 allows smooth passage of air flow 24 from the chamber 5 and ensures minimum impingement on the brush 12, a curved wire mesh 40 integrated with the non-conductive housing 4 at the other end opposite to the curved solid wall 39, a power supply 18 to charge the metallic brush 12 and the curved wire mesh 40, where the metallic brush 12 when charged ionizes the air 24 to produce the ion current 26, facilitating removal of polar molecules from the air 24 to generate purified air 42 from the device 2.

A hydrocarbon adsorbent having high hydrocarbon adsorbing properties even after exposed to a high temperature/high humidity reducing atmosphere, includes a FAU type zeolite having in ESR measurement a spin concentration of a least 1.0 × 10^19 (spins/g) and a ratio of a peak intensity at a magnetic field of at least 260 mT and at most 270 mT to a peak intensity at a magnetic field of at least 300 mT and at most 320 mT of at least 0.25 and at most 0.50 Å and containing bivalent copper. The hydrocarbon adsorbent may be used for a method for adsorbing hydrocarbons to be exposed to a high temperature/high humidity environment, and may be used particularly for a method for adsorbing hydrocarbons in an exhaust gas of an internal combustion engine, such as an automobile exhaust gas.

The invention relates to a water insoluble solid crosslinked dextrin-based matrix, wherein the crosslinking agent is sodium trimetaphosphate (STMP), its use and method of preparation.

The invention relates to a water insoluble solid crosslinked dextrin-based matrix, wherein the crosslinking agent is sodium trimetaphosphate (STMP), its use and method of preparation.

Method for separating gaseous carbon dioxide from air, in particular from ambient atmospheric air (1), by cyclic adsorption/desorption using a sorbent material (3), wherein said sorbent material (3) is a solid inorganic or organic, non-polymeric or polymeric support material functionalized on the surface with amino functionalities capable of reversibly binding carbon dioxide, with a specific BET surface area, preferably measured by nitrogen adsorption, in the range of 1-20 m2/g.