A carbon dioxide adsorbent includes a porous metal oxide represented by Chemical Formula 1, the porous metal oxide having a specific surface area of greater than or equal to about 30 m.sup.2/g, and an average pore size of greater than or equal to about 2 nm.

A method for separating at least one hydrocarbon from a feed containing a mixture of at least one hydrocarbon and nitrogen, comprising contacting the feed with an adsorbent comprising a porous support wherein the porous support comprises exchangeable cations and at least a portion of the exchangeable cations are organic cations.

A method for removing sulfur-based gases from a gas stream comprises contacting a sulfur containing gas stream under dynamic flow conditions with granular activated carbon (GAC) to adsorb substantially all sulfur-containing gas from the gas stream. The granular activated carbon (GAC) can be derived from date palm pits.

A method for the production of synthetic quartz glass using a special cleaning device is provided. The method includes (a) evaporating a production material containing a polymerizable polyalkylsiloxane compound while forming a production material vapor, (b) passing the production material vapor resulting from step (a) through a cleaning device to purify the production material vapor, (c) supplying the purified production material vapor resulting from step (b) to a reaction zone in which the purified production material vapor is converted to SiO.sub.2 particles through oxidation and/or through hydrolysis, (d) depositing the SiO.sub.2 particles resulting from step (c) on a deposition surface, and optionally drying and vitrifying the deposited SiO.sub.2 particles resulting from step (d) to form synthetic quartz glass. The cleaning device includes a bulk of porous silica particles which have a BET specific surface area of at least 2 m.sup.2/g. A device for carrying out the method is also provided.

Amorphous aluminosilicates are disclosed, and these amorphous aluminosilicates are characterized by a unique combination of high surface area, low oil absorption, and a significant fraction of the total pore volume resulting from micropores. These amorphous aluminosilicates can be used in various paint and coating applications, with the resultant dried or solid film capable of removing VOC's from the surrounding air.

Sorbent polymeric material suitable for capturing formaldehyde, polymeric material resulting from the capture of formaldehyde by the sorbent polymeric material, and methods for capturing formaldehyde are provided. The sorbent polymeric material has multiple aromatic rings and can be formed by initially preparing a precursor polymeric material from a polymerizable composition that contains a free-radically polymerizable spirobisindane monomer. The precursor polymeric material is subsequently treated with a sulfonyl-containing compound to form groups of formula —SO.sub.2R.sup.5 where each R.sup.5 is independently —NH.sub.2 or —NR.sup.6-Q-NR.sup.6R.sup.7. Each R.sup.6 is hydrogen or an alkyl. Each R.sup.7 is hydrogen or —C(═NH)—NH.sub.2. Each Q is a single bond, alkylene, or a group of formula -(Q.sup.1-NR.sup.6).sub.x-Q.sup.2- where each Q.sup.1 is an alkylene, each Q.sup.2 is an alkylene, and x is in an integer in a range of 1 to 4.

A carbon porous body has a micropore volume, calculated from an α.sub.s plot analysis of a nitrogen adsorption isotherm at a temperature of 77 K, of 0.1 cm.sup.3/g or less, the micropore volume being smaller than a mesopore volume calculated by subtracting the micropore volume from a nitrogen adsorption amount at a nitrogen relative pressure P/P.sub.0 of 0.97 on the nitrogen adsorption isotherm, wherein a nitrogen adsorption amount at a nitrogen relative pressure P/P.sub.0 of 0.5 on the nitrogen adsorption isotherm is within a range of 500 cm.sup.3 (STP)/g or less, and a nitrogen adsorption amount at a nitrogen relative pressure P/P.sub.0 of 0.85 on the nitrogen adsorption isotherm is within a range of 600 cm.sup.3 (STP)/g or more and 1100 cm.sup.3 (STP)/g or less.

Disclosed is a method of controlling an air supply system for a fuel cell. The air supply system includes a fuel cell stack, an air channel to supply air to an inlet of the fuel cell stack, a gas adsorption unit disposed on the air channel and configured to adsorb oxygen contained in air introduced into the air channel. In particular, the method includes: determining whether a power generation operation of the fuel cell stack is resumed; when the power generation operation of the fuel cell stack is resumed, controlling a voltage source to apply a voltage to the gas adsorption unit; and supplying air to the fuel cell stack through the air channel in a state in which the voltage is applied to the gas adsorption unit.

Disclosed are metal organic frameworks (MOFs) for adsorbing guest species, methods for the separation of gases using the MOFs, and systems comprising the MOFs. The MOFs comprise a plurality of secondary building units (SBUs), each SBU comprising a repeating unit of one metal cation connected to another metal cation via a first moiety of an organic linker; a layer of connected adjacent SBUs in which a second moiety of the linker in a first SBU is connected to a metal cation of an adjacent SBU, and wherein adjacent layers are connected to each other via linker-to-linker bonding interactions

The present invention relates to a zeolite-based adsorbent comprising at least one zeolite of FAU structure of LSX type and comprising barium and/or potassium, in which the outer surface area of said zeolite-based adsorbent, measured by nitrogen adsorption, is between 20 m.sup.2.Math.g.sup.−1 and 100 m.sup.2.Math.g.sup.−1, limits inclusive. The present invention also relates to the use of such a zeolite-based adsorbent as an adsorption agent, and also to the process for separating para-xylene from aromatic isomer fractions containing 8 carbon atoms.