Provided is an adsorbent used for removing carbon dioxide from a gas containing carbon dioxide, the adsorbent containing cerium oxide containing cerium and a metallic element (excluding cerium) having an electronegativity of 1.00 or more.

Provided are sorbents and associated methods and systems for removing mercury from process gases or fluid streams. The sorbents may include activated carbon and pyrite. The sorbents may optionally include one or more additives, such as a halide salt.

Provided is an adsorbent used for removing carbon dioxide from a gas comprising carbon dioxide, the adsorbent comprising a cerium oxide and having an average pore diameter of 50 nm or less, the average pore diameter measured by the BET method using argon gas as an adsorption gas.

Provided is an adsorbent used for removing carbon dioxide from a gas containing carbon dioxide, the adsorbent containing cerium oxide, in which a lattice constant of the cerium oxide is 0.5415 nm or more.

The present invention relates to a superior carbon adsorbent with or without a core. In one embodiment the carbon adsorbent of the present invention employs carbon adsorbent powder and an organic binding agent which are combined together with an appropriate solvent in an agglomeration step. In another embodiment the invention contemplates a core-in-shell adsorbent comprising an outer shell composed of a carbon and a non-adsorbing inert inner core. Low temperature processing of these agglomerates substantially preserves the binding agent within the final composition and allows one to prepare adsorbent products of high sphericity. The adsorbents of the invention possess superior characteristics such as higher mass transfer rate and CO.sub.2 working capacity for use in a H.sub.2PSA process.

A humidity controlling apparatus comprising: a moisture absorption unit including a base material rotatable about a rotation shaft and a macromolecular moisture absorbent provided in a layer on an outer periphery of the base material; and a heat source partially heating the moisture absorption unit, the macromolecular moisture absorbent having a hydrophilic state capable of absorbing moisture in the air and a hydrophobic state which releases the moisture sorbed in the hydrophilic state, the macromolecular moisture absorbent having a nature such that when temperature rises, the macromolecular moisture absorbent changes from the hydrophilic state to the hydrophobic state, and when the temperature falls, the macromolecular moisture absorbent returns from the hydrophobic state to the hydrophilic state, requires small thermal energy and can efficiently control humidity.

A chemical substance concentrator includes a channel allowing a sample containing a chemical substance to flow in a flowing direction in the channel, and a cell wall partitioning the channel into adsorption cells. Each of adsorption cells includes first and second electrodes disposed on the cell wall apart from each other and an adsorption device that adsorbs the chemical substance. The adsorption device contains metal oxide. The absorption device is disposed at a position contacting the first electrode and the second electrode such that the first and second electrodes are electrically connected via the adsorption device.

The invention relates to a device for adsorbing at least one component from a gas mixture by temperature swing adsorption, comprising a through-flow chamber (7) and a cooling chamber (8) for accommodating a heat transfer fluid, wherein the through-flow chamber (7) is separated from the cooling chamber (8), wherein the through-flow chamber (7) has an adsorbent (1) which contains a plurality of (two or more) adsorbent bodies containing a porous and adsorptively additive first material (3) and a second material (4) having better thermal conductivity as compared to the first material (3) and wherein the first material (3) is at least partly surrounded by the second material (4).

The present invention relates to an average-density-adjustable structure and more specifically provides a structure the average density of which is adjusted by changing the material of the structure and the size of a void formed therein and which can thereby float on the surface of or in a liquid and can easily bond with or change a material present in a gas or liquid by being equipped with a first material, which is one among an organic catalyst, an inorganic catalyst, a microorganism, and a biomolecule.

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.