Elaboration of lean nitric oxidize trap for spark ignitron engine with load stratification

Aim of project
Necessity of fuel consumption and carbon dioxide emission decrease by vehicles caused the development of techniques which allow to burn lean mixtures in spark ignition engines. This type of engines, for example FSI (Fuel Stratified Injection) from Volkswagen or HPI (High Pressure Injection) from PSA, can burn stratifi ed mixture with AFR up to 30 and the exhaust gases consist even 10% of oxygen. In these conditions, a classic three-way catalyst TWC has very low ability to reduce NOX. This fact caused the development of TWC reactors construction technology that can convert NOX in the presence of oxygen in exhaust gases. Those kinds of reactors are called LNT (Lean NOX Trap) or NSR (NOX Storage Reduction) in literature.

The aim of the project is to explain, on the basis of a few interdisciplinary empiric investigations, the following scientific problems and suggest their solutions by:
Recognition of nitric oxidize storage effects on chosen alkaline
metals oxides and oxides of alkaline earth metals;

Elaboration of technology that will help to obtain very active sorption surfaces of NOX with high durability and resistance to sinter, working in a wide range of temperatures;

Elaboration of new catalytic configurations (precious metals — oxides layers — monolith beds) for lean nitric oxides traps;

Elaboration of new investigation methods of catalyst properties in modeled and realistic (real engine) conditions;

Elaboration of lean nitric oxidize three-way catalyst that can meet demanded in future environmental protection regulations for this type of engines.

Expected results
The results of the project will be:
Elaboration of technology of receiving durable NO X sorption coats for lean NOX trap for spark ignition engines with stratified load that will be reliable and resistant to sintering and working in a wide range of temperatures;

Elaboration of new catalytic configurations (precious metals — oxides layers — monolith beds) for lean nitric oxides traps;

Elaboration of full size LNT catalyst that can meet future environmental protection regulations for FSI type engines;

Elaboration of new investigation methods of catalyst properties in modeled and real engine conditions;

Elaboration of a new investigation method of LNT catalyst in transient engine cycles with changeable mixture composition rich-lean;

Construction investigation bench with new type of FSI engine in the Institute of Vehicles at Warsaw University of Technology.