A sorbent composition that is useful for injection into a flue gas stream of a coal burning furnace to efficiently remove mercury from the flue gas stream. The sorbent composition may include a sorbent with an associated ancillary catalyst component that is a catalytic metal, a precursor to a catalytic metal, a catalytic metal compound or a precursor to a catalytic metal compound. Alternatively, a catalytic metal or metal compound, or their precursors, may be admixed with the coal feedstock prior to or during combustion in the furnace, or may be independently injected into a flue gas stream. A catalytic promoter may also be used to enhance the performance of the catalytic metal or metal compound.

A method and apparatus (1) for treating a filter (2) for filtering particulate matter from exhaust gas and a treated filter (2) are described. A reservoir (3) containing a dry powder (4) is provided. A vacuum generator (6) establishes a primary gas flow through a porous structure of the filter (2) by applying a pressure reduction to an outlet face of the filter (2). A spray device (7) receives the dry powder (4) from a transport device (8) and sprays the dry powder (4) towards the inlet face of the filter (2). A controller (9) is configured to control operation of at least the vacuum generator (6) and the spray device (7). The dry powder (4) comprises or consists of a metal compound for forming by thermal decomposition a metal oxide.

Disclosed herein is a gas capture system comprising: a gas inlet arranged to receive a gas flow into the system; a gas outlet arranged to provide a gas flow out of the system; a gas capture region for mass transfer between a gas and a sorbent of the gas; and a sorbent regeneration region for regenerating the sorbent by heating the sorbent so that the sorbent releases a gas; wherein: the gas capture region is arranged to receive sorbent from the sorbent regeneration region; the sorbent regeneration region is arranged to receive sorbent for regeneration from the gas capture region; the sorbent is a solid sorbent of carbon dioxide gas; and the gas capture region comprises: a sorbent inlet arranged to receive an input of sorbent into the gas capture region; a sorbent outlet arranged to provide an output of sorbent from the gas capture region; one or more mass transfer regions arranged between the sorbent inlet and the sorbent outlet such that, in use, the sorbent is retained within the one or more mass transfer regions as the sorbent moves through the mass transfer regions and the mass transfer between the gas and the sorbent occurs in the one or more mass transfer regions; a first gas chamber; and a second gas chamber, that is different from the first gas chamber; wherein the first gas chamber, second gas chamber and one or more mass transfer regions are arranged such that, in use, there is a flow path for gas that comprises gas flowing from the first gas chamber into one of the one or more mass transfer regions, the gas then flowing from said one of the mass transfer regions into the second gas chamber and the gas then flowing from the second gas chamber back into said one of the mass transfer regions.

A coated ceramic honeycomb body comprising a honeycomb structure comprising a matrix of intersecting porous walls forming a plurality of axially-extending channels, at least some of the plurality of axially-extending channels being plugged to form inlet channels and outlet channels, wherein a total surface area of the outlet channels is greater than a total surface area of the inlet channels, and wherein a catalyst is preferentially located within the outlet channels, and preferentially disposed on non-filtration walls of the outlet channels. Methods and apparatus configured to preferentially apply a catalyst-containing slurry to the outlet channels and non-filtration walls are provided, as are other aspects.

An adsorbent composition, adsorbent apparatus, and gas purification process using the absorbent composition are provided for the removal of hydrogen sulfide from a gas containing at least hydrogen sulfide as an impurity. The adsorbent composition includes a combination of at least one carbon material, at least one clay material, and at least one metal oxide. In particular, the combination of carbon material(s), clay material(s) and metal oxide(s) provide for effective removal of hydrogen sulfide from a gas at a reduced cost.

A catalyst for oxidation reaction of metallic mercury and reduction reaction of nitrogen oxide, comprising an oxide of titanium, an oxide of molybdenum, an oxide of vanadium, an oxide of phosphorus and gypsum is obtained by kneading titanium dioxide, ammonium molybdate, ammonium metavanadate, phosphoric acid, gypsum dihydrate and water using a kneader to obtain a paste, applying the paste to a metal lath substrate, and then drying and calcining the resultant.

Provided are a novel form of AFX zeolite, a novel synthesis technique for producing pure phase small pore zeolites, a novel synthesis method for producing a zeolite with an increased Al pair content, a catalyst comprising the AFX zeolite in combination with a metal, and methods of using the same.

The present disclosure describes hybrid binary catalysts (HBCs) that can be used as engine aftertreatment catalyst compositions, specifically 4-way catalyst compositions. The HBCs provide solutions to the challenges facing emissions control. In general, the HBCs include a porous primary catalyst and a secondary catalyst. The secondary catalyst partial coats the surfaces (e.g., the internal porous surface and/or the external surface) of the primary catalyst resulting in a hybridized composition. The synthesis of the HBCs can provide a primary catalyst whose entire surface, or portions thereof, can be coated with the secondary catalyst.

Provided is catalyst material useful for the selective catalytic reduction of NOx in lean burn exhaust gas, wherein the catalyst material is a hydrothermally stable, low SAR aluminosilicate zeolite loaded with a synergistic combination of one or more transition metals, such as copper, and one or more alkali or alkaline earth metals, such as calcium or potassium.

A multi-functional composition of matter that is useful for injection into a flue gas stream to rapidly and efficiently remove mercury from the flue gas streams, particularly at above average flue stream temperatures of about 340 F. or higher. The multi-functional composition of matter may include a fixed carbon content of at least about 20 wt. %, a mineral content of from about 20 wt. % to about 50 wt. %, a sum of micropore plus mesopore volume of at least about 0.20 cc/g, a micropore volume to mesopore volume ratio of at least about 0.7, and a tapped density of not greater than about 0.575 g/ml. These compositions may be further characterized by number of particles per gram of the composition of matter such that the composition may have at least about 0.8 billion particles per gram, or even as many as 1.5 billion particles per gram. These physical and chemical properties may enhance (1) the oxidation reaction kinetics for the oxidation of mercury species, (2) frequency of contact events, and (3) capture and sequestration of mercury, to achieve efficient mercury capture by the composition even in high temperature flue gas streams.