An apparatus includes an exhaust analysis circuit and a sensor diagnostics circuit. The exhaust analysis circuit is structured to interpret first oxygen data acquired by a first sensor indicative of a first amount of oxygen in an exhaust flow at a first location along an exhaust aftertreatment system, and interpret second oxygen data acquired by a second sensor indicative of a second amount of oxygen in the exhaust flow at a second location along the exhaust aftertreatment system. The sensor diagnostic circuit is structured to determine at least one of the first sensor and the second sensor are faulty based on the first amount of oxygen and the second amount of oxygen differing more than a threshold value.

Provided are novel synthesis techniques for producing pure phase aluminosilicate zeolite and a catalyst comprising the phase pure zeolite in combination with a metal, and methods of using the same.

A catalytic article for treating an exhaust gas stream containing particulate matter, hydrocarbons, CO, and ammonia, the article may include: (a) a substrate having an inlet end and an outlet end defining an axial length; (b) a first catalyst coating including: 1) a platinum group metal distributed on a molecular sieve, and 2) a base metal distributed on a molecular sieve; and (c) a second catalyst coating including: 1) a platinum group metal distributed on a molecular sieve, and 2) a base metal distributed on a molecular sieve.

[Problem] There is provided an exhaust system capable of sufficiently exhausting a fuel leakage gas leaked from a marine internal combustion engine without diffusing the fuel leakage gas into an engine room. [Solution] An exhaust system according to an aspect of the present disclosure includes: an exhaust duct provided above a marine internal combustion engine installed in an engine room of a ship; and a suction fan that sucks a fuel leakage gas leaking from the marine internal combustion engine into the inside of the exhaust duct from an engine upper unit side of the marine internal combustion engine. The exhaust duct exhausts the fuel leakage gas sucked by the suction fan to the outside of the engine.

A method of extending the useful life of an aged selective catalytic reduction (SCR) catalyst bed, which catalyses the conversion of oxides of nitrogen (NO.sub.x) to dinitrogen (N.sub.2) in the presence of a nitrogenous reductant, in the exhaust gas after treatment system of a stationary source of NO.sub.x so that the exhaust gas emitted to atmosphere from the system continues to meet proscribed limits for both NO.sub.x and ammonia emissions, which method comprising the step of retrofitting an additional honeycomb substrate monolith or a plate-type substrate comprising a catalyst (ASC) for converting ammonia in exhaust gas also containing oxygen to nitrogen and water downstream of the aged SCR catalyst bed, wherein the kNO.sub.x of the honeycomb substrate monolith comprising the catalyst for converting ammonia in exhaust gas also containing oxygen to nitrogen and water is greater than or equal to 80 m/hr between 300 and 400 C. inclusive, wherein kNOx of a sample of the catalyst, which has been aged at 450 C. in 10% H.sub.2O (as steam) in air for 48 hours, is determined by a SCR activity test in a laboratory scale reactor using a gas composition of 50 ppm CO, 30 ppm NO, 36 ppm NH.sub.3, 15% O.sub.2, 8% water, 3% CO.sub.2, balance N.sub.2.

A system for treatment of an exhaust gas stream from an engine is provided, containing an upstream selective catalytic reduction (SCR) catalyst, which receives the exhaust gas stream without any intervening catalyst, a diesel oxidation catalyst (DOC) positioned downstream thereof; a catalyzed soot filter (CSF) downstream of the diesel oxidation catalyst; a second SCR catalyst positioned downstream of the catalyzed soot filter; and an ammonia oxidation (AMOx) catalyst. The application also describes use of such systems to reduce nitrogen oxides (NOx) and hydrocarbons (HC) in an exhaust gas stream.

The present invention relates to an apparatus for reducing greenhouse gas emission in a vessel and a vessel including the same, which are capable of constantly maintaining a concentration of a greenhouse gas absorbing liquid to prevent a decrease in absorption performance of an absorption tower, and applying a pressurization system to prevent the loss of an absorbent liquid due to the natural evaporation of a high-concentration absorbent liquid. Or which are capable of cooling exhaust gas with fresh water by a heat exchange method, thereby preventing a decrease in concentration of an absorbent liquid, and controlling the concentration of the absorbent liquid to constantly maintain the concentration of the absorbing liquid, thereby preventing a decrease in absorption performance.

An exhaust gas aftertreatment system for an internal combustion engine includes an inlet conduit, a reductant decomposition chamber, a first selective catalytic reduction (SCR) catalyst member, a second SCR catalyst member, a mixing chamber, a particulate filter, a reductant delivery system, and a hydrocarbon delivery system. The inlet conduit is configured to receive exhaust gas from the internal combustion engine. The reductant decomposition chamber is fluidly coupled to the inlet conduit and configured to receive the exhaust gas from the inlet conduit. The first SCR catalyst member is fluidly coupled to the reductant decomposition chamber and configured to receive the exhaust gas from the reductant decomposition chamber. The second SCR catalyst member is fluidly coupled to the first SCR catalyst member and is configured to receive the exhaust gas from the first SCR catalyst member.

Systems and methods of the present invention related to an exhaust gas purification system comprising: (a) a first injector for injecting ammonia or a compound decomposable to ammonia into the exhaust gas; (b) a diesel particulate filter including an inlet and an outlet, wherein the filter includes a selective catalyst reduction (SCR) catalyst and an oxidation catalyst; (c) a second injector for injecting ammonia or a compound decomposable to ammonia into the exhaust gas, located downstream of the filter; and (d) a downstream catalyst comprising a selective catalytic reduction catalyst, located downstream of the second injector.

An apparatus includes a housing defining an internal volume and structured to house aftertreatment component for reducing constituents of an exhaust gas. A noise reducing component is disposed within the internal volume and structured to extend around at least a portion of the aftertreatment component.