A (V)PSA unit for purifying a gas stream by adsorption is provided. The (V)PSA unit comprises, arranged successively in the direction of flow of the feed gas stream, a rotary-structured adsorbent wheel configured so as to drive the gas stream therethrough in an axial manner and allowing the feed gas to dry to a level corresponding to a dew point below −30 C, and an adsorber with a centripetal radial configuration, comprising a bed of particulate adsorbent.

A photoresponsive oxygen storage material includes a plurality of unit cells. Each of the plurality of unit cells has a shape of a cube having eight corners and six faces. Each of the plurality of unit cells includes a plurality of zirconium-oxo clusters each located at a corresponding corner of the eight corners, and a plurality of ligands each located on a corresponding face of the six faces and each having a porphyrin skeleton and including greater than or equal to 1 and less than or equal to 4 carboxy groups. A molybdenum ion is located at a center of the porphyrin skeleton, and at least some of the plurality of unit cells are empty.

A (V)PSA unit for purifying a gas stream by adsorption is provided. The (V)PSA unit comprises, arranged successively in the direction of flow of the feed gas stream, a rotary-structured adsorbent wheel configured so as to drive the gas stream therethrough in an axial manner and allowing the feed gas to dry to a level corresponding to a dew point below 30 C., and an adsorber with a centripetal radial configuration, comprising a bed of particulate adsorbent.

A novel one-pot solvothermal reaction based on urea hydrolysis to synthesize single crystals of the Zn(NH.sub.3)(CO.sub.3) inorganic helical framework and its applications in selective CO.sub.2 separation.

An oxygen adsorbent which can be manufactured at a low cost, and an oxygen manufacturing equipment and an oxygen manufacturing method which are capable of producing oxygen-enriched gas at a low cost by using the oxygen adsorbent are provided. The oxygen adsorbent comprises at least an oxide of a perovskite structure. The oxide is represented by a compositional formula of Sr.sub.1xCa.sub.xFeO.sub.3, wherein 0.12x0.40, 00.5. Since this oxide does not include La and Co included in a conventional oxygen adsorbent, it can be manufactured at a low cost.

The present invention provides an oxygen selective adsorbent containing oxides of Ba.sub.xSr.sub.(1x)Mg.sub.y(CO.sub.3).sub.(1+y) or Ba.sub.xSr.sub.(1x)CO.sub.3 particles, increasing transition oxygen partial pressure, and representing high thermal stability and excellent oxygen sorption cavity, by adding another metal such as Sr to Ba which is active element for oxygen adsorption, so as to be capable of desorbing oxygen under lower vacuum even at the same operating temperature than the existing oxygen selective adsorbent; and a preparation method thereof.

The present invention relates to a nitrogen adsorbent having nitrogen selective adsorptivity by including an organic-inorganic hybrid nanoporous material having a coordinatively unsaturated metal site with density of 0.2 mmol/g to 10 mmol/g in a skeleton, surface or pore; and use thereof, such as a device separating nitrogen from a gas mixture containing nitrogen and methane, a pressure swing adsorption separation device and a temperature swing adsorption separation device for separating nitrogen provided, a method for separating nitrogen and methane from a gas mixture containing nitrogen and methane, a device for separating nitrogen, oxygen or argon, a method for separating nitrogen, oxygen or argon from a gas mixture containing nitrogen, oxygen or argon, and a method for preparing nitrogen or high purity inert gas all separated from a gas mixture containing nitrogen and inert gas.

Fe.sub.2(dobdc) has a metal-organic framework with a high density of coordinatively-unsaturated Fe.sup.II centers lining the pore surface. It can be effectively used to separate O.sub.2 from N.sub.2 and in a number of additional separation applications based on selective, reversible electron transfer reactions. In addition to being an effective O.sub.2 separation material, it can be used for many other processes, including paraffin/olefin separation, nitric oxide/nitrous oxide separation, acetylene storage, and as an oxidation catalyst.

An oxygen adsorbent which can be manufactured at a low cost, and an oxygen manufacturing equipment and an oxygen manufacturing method which are capable of producing oxygen-enriched gas at a low cost by using the oxygen adsorbent are provided. The oxygen adsorbent comprises at least an oxide of a perovskite structure. The oxide is represented by a compositional formula of Sr.sub.1xCa.sub.xFeO.sub.3, wherein 0.12x0.40, 00.5 Since this oxide does not include La and Co included in a conventional oxygen adsorbent, it can be manufactured at a low cost.

An oxygen storage material including a compound of the formula: Ca.sub.2MnAlO.sub.5+ wherein 00.5 wherein the compound includes at least one dopant said dopant selected from alkaline earth ions at the Ca site, trivalent ions at the Al site, and 3d transition metal ions at the Mn site wherein the an oxygen release temperature or an oxygen storage temperature is modified in comparison to an un-doped Ca.sub.2MnAlO.sub.5+ material.