Methods and systems are provided for monitoring a NOx storage capacity of a passive NOx adsorption catalyst (PNA) included in an exhaust gas after-treatment system of an engine. In one example, a method may include, after an engine cold start and prior to an exhaust gas temperature reaching an upper threshold temperature, indicating degradation of the PNA based on an amount of NOx measured downstream of the PNA during a fuel cut event and while the exhaust gas temperature is between a lower threshold temperature and the upper threshold temperature. In this way, degradation of the NOx storage capacity may be inferred based on an amount of NOx released from the PNA and independent of a NOx storage measurement.

An integrated reductant mixer and heater apparatus for an exhaust treatment system is provided. The apparatus includes a housing for an exhaust stream to flow therethrough in an axial flow direction; a reductant injector configured to deliver a spray of reductant into the exhaust stream; at least one mixing fin disposed within the housing interior downstream of the reductant injector, the mixing fin having a primary deflection surface orientated parallel with, or at an acute angle relative to, the axial flow direction; a first heater element within the housing interior and extending within a first plane intersecting the axial flow direction proximate the primary deflection surface of the mixing fin; and a second heater element within the housing interior and extending within a second plane intersecting the axial flow direction proximate the primary deflection surface of the mixing fin and downstream from the first heater element.

Methods and systems are provided for a low temperature NOx adsorber (LTNA). In one example, a method includes initiating a desulfation of an LTNA responsive to an estimated sulfur exposure exceeding a threshold, the desulfation including heating the LTNA to a first threshold temperature while maintaining an exhaust oxygen level above a threshold level throughout the entire desulfation.

A pump for a reductant insertion assembly, comprises a housing configured to receive a reductant. A pumping element is disposed within the housing. The pumping element configured to pressurize the reductant and communicate the pressurized reductant out of the housing. The housing and/or the pumping element comprises aluminum, and the pump further comprises a corrosion resistant layer disposed on at least a portion of a surface of the housing and/or the pumping element that is configured to contact the reductant. The corrosion resistant layer comprising a fluoropolymer.

A method for operating an internal combustion engine includes combusting a fuel and air mixture within a combustion chamber of an internal combustion engine, thereby forming an exhaust gas, passing the exhaust gas out of the combustion chamber, performing a startup procedure, the startup procedure including passing the exhaust gas from the combustion chamber to a storage unit, capturing criteria pollutants of the exhaust gas with the storage unit, passing the exhaust gas from the storage unit to an aftertreatment system, heating the aftertreatment system to an activation temperature with the exhaust gas from the storage unit, and subsequent to heating the aftertreatment system to the activation temperature, performing a secondary procedure, the secondary procedure including passing the exhaust gas from the combustion chamber to the aftertreatment system thereby forming a treated exhaust gas, and passing the treated exhaust gas to the storage unit.

An integrated reductant mixer and heater apparatus for an exhaust treatment system is provided. The apparatus includes a housing for an exhaust stream to flow therethrough in an axial flow direction; a reductant injector configured to deliver a spray of reductant into the exhaust stream; at least one mixing fin disposed within the housing interior downstream of the reductant injector, the mixing fin having a primary deflection surface orientated parallel with, or at an acute angle relative to, the axial flow direction; a first heater element within the housing interior and extending within a first plane intersecting the axial flow direction proximate the primary deflection surface of the mixing fin; and a second heater element within the housing interior and extending within a second plane intersecting the axial flow direction proximate the primary deflection surface of the mixing fin and downstream from the first heater element.

Methods are provided for emissions control of a vehicle. In one example, a method for an engine may include, responsive to a plurality of diagnostic entry conditions being met, indicating degradation of a hydrocarbon trap based on an NH.sub.3 amount in an exhaust gas. In some examples, the NH.sub.3 amount may be determined based on one or more NO.sub.x sensor outputs. In some examples, the plurality of diagnostic entry conditions may include the engine having been in operation over an initial duration immediately following an engine cold start. Conditions of the exhaust gas following the engine cold start may be opportunistically utilized in determining the NH.sub.3 amount from the one or more NO.sub.x sensor outputs. In some examples, the exhaust gas may be actively provided at a predetermined air-fuel ratio to meet at least one of the plurality of diagnostic entry conditions.

A process for the preparation of a zeolitic material having a FAU-type framework structure comprising YO.sub.2 and X.sub.2O.sub.3, comprising: (a) preparing a mixture comprising one or more sources of YO.sub.2, one or more sources of X.sub.2O.sub.3, and one or more structure directing agents (SDA); (b) crystallizing the zeolitic material from the mixture obtained in (a); wherein Y is a tetravalent element and X is a bivalent element, and wherein the one or more structure directing agents comprise one or more isomers of diaminomethylcyclohexane. A zeolitic material having an FAU-type framework structure obtained according to the inventive process; processes for preparing a coated substrate and a shaped body, respectively, from the zeolitic material having a FAU-type framework structure obtained according to the inventive process and, a method for selectively reducing nitrogen oxides NOx employing said zeolitic material.

An exhaust gas catalyst system that includes at least one exhaust canister including an inlet separated from an outlet with catalytic components positioned between the inlet and outlet. The at least one exhaust canister receives a flow of exhaust gas. The at least one exhaust canister includes a pair of concentric passages formed therein including a central passage and an outer passage. A split flap valve is positioned in the inlet. An actuator is coupled to the split flap valve. A control unit is operably connected to the actuator and selectively moves the split flap valve closing one of the concentric passages and locally heating a portion of the catalytic components.

A thermal overload of an internal combustion engine and of cooling system of a combustion machine due to a raising of the temperature of the exhaust gas flowing through an exhaust gas line of the combustion machine, which is provided as a measure to desulfurize a NO.sub.x storage catalytic converter and/or to regenerate a particulate filter, is prevented in that before and/or during this measure, the cooling output for the coolant flowing through the cooling system is systematically increased in order to achieve a lowering of the coolant temperature to a value range that lies below what would normallythat is to say, without the simultaneous desulfurization of the NO.sub.x storage catalytic converter and/or without the regeneration of the particulate filterhave been provided for the operation of the combustion machine in a corresponding operating state of the internal combustion engine.