This invention provides a method to clean the inside surfaces of an engine and its exhaust after-treatment system each time the engine is shut down. This cleaning is accomplished without disassembly of the engine and without involvement of the engine's operator. This cleaning includes the combustion chamber, valves, intake and exhaust ports, particulate filters, catalytic after-treatment processes, and exhaust piping. This is accomplished by leaving the shut down engine and its exhaust after-treatment systems in an oxygen rich atmosphere where oxidation of the hydrocarbons on the inside surfaces continues.

This invention provides a method to clean the inside surfaces of an exhaust after-treatment system each time the engine is shut down. This cleaning is accomplished without disassembly of the engine and without involvement of the engine's operator. This cleaning includes the exhaust ports, particulate filters, catalytic after-treatment processes, and exhaust conduits. This is accomplished by leaving the exhaust after-treatment systems in an oxygen rich atmosphere, with the engine shut down, where oxidation of the hydrocarbons on the inside surfaces continues.

An exhaust gas purification apparatus provided to purify the exhaust gas of an engine includes: an exhaust line through which exhaust gas discharged from the engine passes, a diesel oxidation catalyst (DOC) installed in the exhaust line to purify hydrocarbons (HC) and carbon monoxide (CO) in the exhaust gas, a urea injector for spraying a urea aqueous solution inside the exhaust line, and a selective catalyst reduction (SCR) for reducing nitrogen oxides (NOx) of exhaust gas that has passed through the DOC using the urea aqueous solution. In particular, the DOC includes a cerium-zirconium oxide (CeZrOx) catalyst.

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.

To provide a hydrocarbon adsorbent having high hydrocarbon adsorbing properties even after exposed to a high temperature/high humidity reducing atmosphere.

A hydrocarbon adsorbent, which includes a FAU type zeolite having a lattice constant of at least 24.29 and containing copper. Such a hydrocarbon adsorbent may be used for a method for adsorbing hydrocarbons to be exposed to a high temperature/high humidity environment, and may be used particularly for a method for adsorbing hydrocarbons in an exhaust gas of an internal combustion engine, such as an automobile exhaust gas.

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.

Method for operating an internal combustion engine which has a gas combustion system and an exhaust gas post-treatment system. Exhaust gas that leaves the gas combustion system is directed to at least one CH4 oxidation catalytic converter of the exhaust gas post-treatment system. The CH4/NO2 mole ratio in the exhaust gas is set in a defined fashion by at least one gas-combustion-system-side and/or exhaust-gas-post-treatment-system-side measure upstream of at least one CH4 oxidation catalytic converter.

A system and method for reduction of Nitrogen Oxide emissions from marine engines by converting Nitrogen Oxide into Nitrogen is disclosed. The modular reactive cyclic induction apparatus connects to the exhaust of a conventional diesel marine engine and uses air pressure and the sodium chloride in seawater to create a molecular reaction to break down Nitrogen Oxide into Nitrogen by use of an induction apparatus. The system can also include a loop for removing Carbon Dioxide through electrolysis, and removes other environmental pollutants as well, including for example Sulphur oxides, hydrocarbons, and particulate matter during the process.

The present invention relates to a catalyst comprising a carrier substrate of the length L extending between substrate ends a and b and a first washcoat zone, which comprises a) a zeolite, b) a redox active base metal compound and c) palladium in oxidic or metallic state which is fixed to the surface of a support oxide.

Provided are a novel synthesis technique 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.