Provided is a waste gas treatment device including a waste gas inlet configured to introduce waste gas discharged from a semiconductor processing chamber and an adsorption unit configured to adsorb competitive adsorption gas from the waste gas flowing from the waste gas inlet, and configured to adsorb xenon (Xe) from the waste gas from which the competitive adsorption gas has been removed, and recover the adsorbed xenon. Also provided are waste gas treatment methods, and waste gas adsorption and recovery systems including the present waste gas treatment devices.

The present disclosure is directed to an acidic gas absorbent particulate for capture of an acidic gas from a gaseous stream or atmosphere, the acidic gas absorbent particulate comprising swellable support particles, wherein the swellable support particles contain absorbed amine-functionalised ionic liquid for absorbing the acidic gas, and to apparatuses, processes, methods and uses comprising the same.

Methods of improving sorbent lifetime when performing direct air capture (DAC) of carbon dioxide from carbon dioxide-containing gas mixtures are described. The methods use ammonia gas to regenerate sorbent and release carbon dioxide from the sorbent. These methods prevent degradation and erosion of the sorbent, extending lifetimes of DAC systems, greatly reducing operating cost and making these systems more economically feasible.

A pressure swing adsorption (PSA) device includes an adsorption tower configured to introduce hydrogen gas and adsorb impurity components in the hydrogen gas by using a pressure swing adsorption (PSA) method, an adsorbent of one layer made of activated carbon or an adsorbent of two layers in which activated carbon and zeolite are stacked being disposed in the adsorption tower, the hydrogen gas containing carbon monoxide (CO) of 0.5 vol % or more and 6.0 vol % or less and methane (CH.sub.4) of 0.4 vol % or more and 10 vol % or less as the impurity components; and a densitometer configured to detect a concentration of CO in the hydrogen gas discharged from the adsorption tower, wherein the impurity components are adsorbed and removed to cause the CO concentration measured by the densitometer to fall below a threshold.

The invention relates to a noxious gas purificant and its preparation and purification method for removing nitrogen oxides from gas streams thereof. The preparing method is characterized in that: mixing, according to a predetermined ratio and a process, a salt of iron, manganese, cobalt, or copper, and a related derivative thereof, an alkali or alkaline substance and a related derivative thereof, water and a forming agent, so as to obtain a solid compound or mixture; drying and activating the solid compound or mixture to produce a solid product as the purificant; and introducing the purificant into a gas-solid reactor, and removing noxious gases in a gas stream by performing, in a preconfigured temperature and using the purificant, a gas-solid reaction on the harmful gases in the gas stream. The purificant can be recycled and reused.

The present invention regards a process for operating a high-temperature solid oxide electrolysis system suitable for converting a fuel stream into a product stream as well as a system for carrying out the process. The process involves drying a moist flush gas and using the spent flush gas as regeneration gas in the drying unit.

A honeycomb structure supporting CO.sub.2 adsorbent includes: a honeycomb structure portion including partition walls extending from a first end surface to a second end surface and partitioning a plurality of cells which form fluid flow paths; and a layer of CO.sub.2 adsorbent covering at least a part of a surface of the partition walls, the layer of CO.sub.2 adsorbent including an alkali metal carbonate supported on a porous material containing one or more selected from zeolite, alumina, and silica, a total content of zeolite, alumina, and silica being 50% by mass or more in the porous material.

The present disclosure provides a multi-channel adsorption tower including a tower body, an upper head, a lower head, tray assemblies, partition assemblies, a support plate, ceramic balls and an adsorbent. The interior of the adsorption tower is divided from bottom to top into a feed chamber, a first-stage adsorption chamber, a second-stage adsorption chamber, a third-stage adsorption chamber and a discharge chamber in sequence by the tray assemblies. Each adsorption chamber is equally divided into four material compartments by the partition assemblies. The adsorption chambers are filled with the adsorbent, and unloading ports are provided at the outside of each adsorption chamber. A feed port is provided at the bottom of the lower head, and a discharge port is provided at the top of the upper head. The feed chamber and the discharge chamber contain ceramic balls. The arrangement provides two material paths in the adsorption tower.

An evaporative emissions canister is provided. The canister includes a casing defining an internal volume therein. The casing includes an inlet and an outlet in fluid communication with the internal volume. The internal volume includes a chamber adjacent to the inlet and the outlet. A first layer of adsorbent material is disposed within the chamber. A layer of non-adsorbent material is disposed adjacent to the first layer of adsorbent material. The non-adsorbent material is one or a combination of an open cell foam, non-adsorbent particles having a Sauter mean diameter (SMD) of greater than 2 mm, and air. The layer of non-adsorbent material may be disposed directly between the first layer of adsorbent material and one or both of the inlet and outlet. The layer of non-adsorbent material has a flow restriction that is less than a flow restriction of the first layer of adsorbent material.