A problem to be solved by the present invention is to provide a new form of adsorbent suitable for a motor vehicle canister. An activated carbon fiber sheet satisfies one or two or more of conditions for indices, such as a specific surface area, a pore volume of pores having a given pore diameter, and a sheet density. An embodiment, for example, may have: a specific surface area ranging from 1400 to 2300 m.sup.2/g; a pore volume ranging from 0.20 to 0.70 cm.sup.3/g for pores having pore diameters of more than 0.7 nm and 2.0 nm or less; an abundance ratio R.sub.0.7/2.0, which is a ratio of a pore volume of micropores having pore diameters of 0.7 nm or less occupied in a pore volume of micropores having pore diameters of 2.0 nm or less, ranging from 5% to less than 25%, and a sheet density ranging from 0.030 to 0.200 g/cm.sup.3.

To provide a material capable of adsorbing lead from water with a pH of 8 or more. A porous body of a titanium-containing compound, which has a bulk specific gravity of 0.4 g/cm.sup.3 or less, is used as an adsorbent.

Carbon dioxide (CO.sub.2) capture materials comprising one or more 3D-printed zeolite monoliths for the capture and or removal of CO.sub.2 from air or gases in enclosed compartments, including gases or mixtures of gases having less than about 5% CO.sub.2. Methods for preparing 3D-printed zeolite monoliths useful as CO.sub.2 capture materials and filters, as well as methods of removing CO.sub.2 from a gas or mixture of gases in an enclosed compartment using 3D-printed zeolite monoliths are provided.

An activated carbon sorbent composition comprising activated carbon and a passivation agent, wherein the activated carbon sorbent composition exhibits reduced self-heating or auto-ignition properties as compared to the activated carbon. The activated carbon sorbent composition may be utilized to sequester contaminants such as mercury from a flue gas stream. The passivation agent includes a sulfur species, and may be a sulfur oxide compound, a sulfide compound, or an organic sulfur compound. Methods for the manufacture of the activated carbon sorbent composition and for the sequestration of contaminants in a flue gas stream using the composition are also disclosed.

An object is to provide an adsorbent using activated carbon fiber, the adsorbent being suitable for motor vehicle canisters and enabling reduction in pressure loss.

An activated carbon fiber sheet for a motor vehicle canister fulfils the following conditions (1) to (4). (1) The sheet has a specific surface area ranging from 1100 to 2300 m.sup.2/g. (2) The sheet has a density ranging from 0.010 to 0.200 g/cm.sup.3 or less. (3) The sheet has a thickness ranging from 0.1 to 100.00 mm. (4) The sheet has a fiber size of 13.0 μm or larger.

An adsorbent and a granulated substance for which reduction in adsorption performance in low humidity environments is suppressed are provided. The adsorbent includes: a porous body mainly composed of silicon dioxide, including a plurality of fine pores, and having a specific surface area of not less than 1 m.sup.2/g and not more than 10 m.sup.2/g; one of an acid and a base with which inside of the fine pores of the porous body is impregnated to neutralize a target gas to generate a salt; and a hydrophilic fiber held in the porous body.

The present invention is related to a process for manufacturing a sorbent suitable for a use in a circulating dry scrubber device comprising the steps of: providing quicklime and water in an hydrator; slaking said quicklime via a non-wet route in the hydrator; collecting a lime based sorbent at an exit of the hydrator. The process is characterized in that it comprises a further step of adding at least a first additive comprising: a compound comprising silicon, and/or, a compound comprising aluminum, and/or a compound comprising silicon and aluminum before or during said slaking step, at a molar ratio between silicon or aluminum or a combination thereof and the calcium provided to said hydrator equal to or below 0.2 and equal to or above 0.02. In some other aspects, the present invention is related to a sorbent, a premix, and a flue gas treatment process.

The present invention relates to an activated carbon, having a pore volume (A) of 0.3 to 0.7 mL/g at a pore diameter of 6.5 to 50 nm as determined by mercury intrusion porosimetry, a pore volume (B) of 0.23 mL/g or less at a pore diameter of 750 to 4,000 nm as determined by mercury intrusion porosimetry, and a pore volume ratio (A)/(B) of 1.7 or higher.

A continuous desulfurization process and process system are described for removal of reduced sulfur species at gas stream concentrations in a range of from about 5 to about 5000 ppmv, using fixed beds containing regenerable sorbents, and for regeneration of such regenerable sorbents. The desulfurization removes the reduced sulfur species of hydrogen sulfide, carbonyl sulfide, carbon disulfide, and/or thiols and disulfides with four or less carbon atoms, to ppbv concentrations. In specific disclosed implementations, regenerable metal oxide-based sorbents are integrated along with a functional and effective process to control the regeneration reaction and process while maintaining a stable dynamic sulfur capacity. A membrane-based process and system is described for producing regeneration and purge gas for the desulfurization.

The present invention relates to an activated carbon, having a BET specific surface area (A) of 1,250 to 1,800 m.sup.2/g as determined from a carbon dioxide adsorption isotherm, and a ratio (B)/(C) of 0.640 or lower between a pore volume (B) mL/g at a pore diameter of 0.4 to 0.7 nm and a pore volume (C) mL/g at a pore diameter of 0.7 to 1.1 nm as determined by performing a grand canonical Monte Carlo simulation on a carbon dioxide adsorption-desorption isotherm.