A system for controlling reductant spray momentum for a target spray distribution includes an exhaust system having an exhaust conduit with exhaust flowing therethrough, a reductant injection system for injecting reductant into the exhaust flowing through the exhaust system based on one or more injection parameters, a reductant supply system for supplying reductant to the reductant injection system based on one or more supply parameters, and a controller. The controller is configured to access current vehicle, engine, exhaust, or reductant condition parameters, determine one or more control parameters based on a control model and the accessed current CZ vehicle, engine, exhaust, or reductant condition parameters, and modify a value of the one or more injection parameters or the one or more supply parameters to control the reductant spray.

Certain selective catalytic reduction (SCR) articles, systems and methods provide for high NOx conversion while at the same time low N.sub.2O formation. The articles, systems and methods are suitable for instance for the treatment of exhaust gas of diesel engines. Certain articles have zoned coatings containing copper-containing molecular sieves disposed thereon, where for example a concentration of catalytic copper in an upstream zone is lower than the concentration of catalytic copper in a downstream zone.

The present invention relates to a composite metal oxide which comprises 80 to 97 wt %, in relation to the weight of the composite metal oxide, of one or more oxides of cerium and 3 to 20 wt %, in relation to the composite metal oxide of a metal oxide comprising tin oxide (SnO.sub.2) and lanthanum oxide (La.sub.2O.sub.3) and/or aluminum oxide (Al.sub.2O.sub.3), a composite material for the storage of nitrogen oxides which comprises such composite metal oxide and palladium, as well as an exhaust gas system containing said composite material.

A mixer arrangement for aftertreatment of exhaust gas including comprising a housing configured to form a cavity including a center flow channel in which the exhaust gas flows; and at least one side inlet arrangement configured to allow the exhaust gas to enter the center flow channel from the sides thereof and configured to cause an advancing center flow in the center flow channel and a rotating flow around or on the edges of the center flow in the center flow channel; wherein the at least one side inlet arrangement contains at least a pair of side inlet pipes on the side of the center flow channel.

A substrate coating apparatus comprises a source of a washcoat, a washcoat showerhead comprising a showerhead plate having a plurality of nozzle apertures for discharging the washcoat towards a face of the substrate located below the washcoat showerhead, a conduit fluidly connecting the source of the washcoat to the washcoat showerhead for supplying washcoat to the washcoat showerhead and a partition ring located between the washcoat showerhead and the face of the substrate. The partition ring is dimensioned to be smaller than the face of the substrate and the substrate coating apparatus is configured in use to bring the partition ring into contact with the face of the substrate to thereby define a central region of the face of the substrate which lies within an interior of the partition ring and a peripheral region of the face of the substrate which lies outside the partition ring. The showerhead plate of the washcoat showerhead is configured in use to discharge washcoat onto both the central region and the peripheral region of the face of the substrate.

The present application discloses a molecular sieve Cu-SSZ-13, its synthesis method, a catalyst and the application of the catalyst in the treatment of exhaust gas of motor vehicles, especially its application in the treatment of exhaust gas of diesel vehicles, belonging to the field of catalytic materials. The content of copper calculated on the basis of CuO in the molecular sieve Cu-SSZ-13 is 2.56 to 3.69 wt %, and the content of non-framework aluminum in the molecular sieve before adding copper is 0 to 8 wt %. The Cu-SSZ-13 of the present application has a specific combination of contents of copper and non-framework aluminum, improves the selectivity of N.sub.2 generated in the selective catalytic reduction of ammonia, reduces the selectivity of N.sub.2O, and can control the N.sub.2O in the product within 15 ppm. Cu-SSZ-13 as a catalyst has good resistance to hydrothermal aging, and has significant performance advantages in the application in the treatment of exhaust gas of diesel vehicles.

The present disclosure relates to an exhaust gas aftertreatment system and method for controlling same. The exhaust gas aftertreatment system comprises: a reductant dosing device; a selective catalytic reduction device arranged downstream of the reductant dosing device; an ammonia slip catalyst arranged downstream of the SCR device; a feedback NOx sensor arranged downstream of the SCR device and upstream of the ammonia slip catalyst; a tailpipe NOx sensor arranged downstream of the ammonia slip catalyst; and a control device configured for: providing an initial dosing of reductant from the reductant dosing device; obtaining a feedback signal from the feedback NOx sensor and a tailpipe NOx signal from the tailpipe NOx sensor; and adjusting the dosing of reductant until the feedback signal exceeds the tailpipe NOx signal by a value within a predetermined positive interval.

The present disclosure provides a method of forming a selective catalytic reduction (SCR) catalyst, the method including receiving a first iron-promoted zeolite having a first iron content, and treating the iron-promoted zeolite with additional iron in an ion exchange step to form a second iron-promoted zeolite with a second iron content, the second iron content being higher than the first iron content. A selective catalytic reduction (SCR) catalyst composition including an ironpromoted zeolite having at least about 6 weight percent iron, based on total weight of the ironpromoted zeolite, wherein the iron content of the zeolite was added to the zeolite in at least two separate steps is also provided herein.

The present disclosure provides catalyst compositions capable of reducing nitrogen oxide (NO.sub.x) emissions in engine exhaust, catalyst articles coated with such compositions, and processes for preparing such catalyst compositions and articles. The catalyst compositions include metal ion-exchanged zeolites useful for selective catalytic reduction (SCR) of NO.sub.x. Further provided is an exhaust gas treatment system including such catalytic articles, and methods for reducing NO.sub.x in an exhaust gas stream using such catalytic articles.

Aspects of the disclosure relate to a diesel exhaust fluid tank for a vehicle. An exemplary diesel exhaust fluid tank includes a tank body to store diesel exhaust fluid, a tank supply line to deliver the diesel exhaust fluid to a Selective Catalytic Reduction (SCR) device, and a tank siphon line to drain the diesel exhaust fluid from the tank body. The tank siphon line is mounted to the tank body and includes a siphon inlet (e.g., devoid of a filter) at or proximate to a bottom wall of the tank body. The integrated tank siphon line avoids any need to remove tank components to feed a siphon tube into a tank. Further, the tank siphon line leverages preexisting components in the diesel exhaust fluid tank and/or the vehicle to siphon diesel exhaust fluid as needed.