An adsorbate-selective metal organic framework includes a transition metal; and a plurality of organic molecules coordinated to the transition metal so as to preserve open coordination sites for selectively adsorbing molecules that have low-lying * orbitals. The transition metal has a lowest energy spin state in the presence of the selectively adsorbed molecules that are strongly bonding to the transition metal through -donating interactions which is different than the lowest energy spin state in the absence of these adsorbed molecules. The transition metal has also a lowest energy spin state in the presence of non-selected molecules that are weakly bonding to the transition metal through - and/or -accepting and/or donating interactions.

Provided is an oxygen concentration device which, as an oxygen concentration device having a reduced difference in flow rates of gas which flows through a pressure equalization valve of a pressure equalization path during a purge step and a pressure equalization step, is provided at at least one end side of the pressure equalization valve with a pressure control member having a difference in pressure loss due to the direction of gas flow so that pressure loss of the gas which flows through the pressure equalization path in one direction becomes nearly equal to that of the gas which flows therethrough in the opposite direction.

Discloses herein is an activated metal-organic framework of formula as defined in the application, and the metal organic framework has a BET surface area of from 250 to 1,000 m.sup.2/g as obtained from a 298 K CO.sub.2 sorption isotherm. In a particular embodiment, the activated metal-organic framework is aluminium formate (Al(HCOO).sub.3) or vanadium formate (V(HCOO).sub.3).

Methods of designing zeolite materials for adsorption of CO.sub.2. Zeolite materials and processes for CO.sub.2 adsorption using zeolite materials.

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 disclosure provides for adsorbents with stepped isotherms for gas storage applications.

Methods of designing zeolite materials for adsorption of CO.sub.2. Zeolite materials and processes for CO.sub.2 adsorption using zeolite materials.

A gas desorption apparatus includes a central desorption chamber defining an interior portion adapted for heating, an inlet airlock coupled to chamber, a pump system coupled to each interior portion of the chamber and the inlet airlock and operable to create a pressure equivalency between the interior portions, and a channel disposed between the interior portion of the desorption chamber and an adsorbate storage chamber. The inlet airlock includes an exit port allowing passage from the interior portion of the inlet airlock into the interior portion of the central desorption chamber, an egress port allowing passage from an exterior portion of the inlet airlock into the interior portion of the inlet airlock and a toggleable door at each of the egress port and the ingress port sealing the interior portion of the inlet airlock when each said toggleable door is in a closed position.

The present invention relates generally to an attrition resistant core-in-shell composite adsorbent comprising at least a zeolite-containing CO.sub.2 removal adsorbent and a binder on an inert dense core. The attrition resistant core-in-shell composite adsorbent has an attrition loss of less than about 2 wt %. The core-in-shell composite adsorbent is preferably used in a multi-layered adsorption system in a cyclic adsorption process, preferably used in a PSA prepurification process prior to cryogenic air separation.

The present disclosure provides a method for generating higher hydrocarbon(s) from a stream comprising compounds with two or more carbon atoms (C.sub.2+), comprising introducing methane and an oxidant (e.g., O.sub.2) into an oxidative coupling of methane (OCM) reactor. The OCM reactor reacts the methane with the oxidant to generate a first product stream comprising the C.sub.2+ compounds. The first product stream can then be directed to a separations unit that recovers at least a portion of the C.sub.2+ compounds from the first product stream to yield a second product stream comprising the at least the portion of the C.sub.2+ compounds.