Sökning: "lean NOx trap"

Visar resultat 6 - 9 av 9 avhandlingar innehållade orden lean NOx trap.

  1. 6. Aging of Lean NOX Trap Catalysts and Hydrocarbon Trapping in Cold-Start Applications

    Författare :Rasmus Jonsson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : It is well known that combustion processes worldwide give rise to emissions such as nitrogen oxides (NOX), carbon monoxide (CO), hydrocarbons (HC) and particulates. For vehicles, the method for handling these emissions has been through the development of the catalytic converter. LÄS MER

  3. 7. Deactivation mechanisms influencing the performance and durability of exhaust aftertreatment systems

    Författare :Jesus De Abreu Goes; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Thermal degradation; Gasoline particulate filters; Lean NOx traps; Sulfur poisoning.;

    Sammanfattning : As countermeasure to air pollution and global warming, more stringent environmental policy measures will probably come into force with the future emission standards, which will require important developments for gasoline and diesel vehicles to meet the emerging criteria. Efficient catalytic formulations and advanced strategies for exhaust aftertreatment systems will be therefore demanded to provide both high catalytic activity and stability, minimizing the environmental impact by automobiles. LÄS MER

  4. 8. Investigation of La promoted Pd/BEA Performance for Passive NOx adsorption processes

    Författare :Rojin Feizie Ilmasani; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NO TPD; Ceria; Zirconium; Lanthanum; Pd BEA; PNA; CO effect;

    Sammanfattning : Lean-burn combustion engines have been used to improve fuel efficiency by reducing fuel consumption. However, these engines face challenges in lean reduction of NOx for exhaust after-treatment systems. LÄS MER

  5. 9. Supervisory control of complex propulsion subsystems

    Författare :Dhinesh Vilwanathan Velmurugan; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Look-ahead control; engine control; exhaust after-treatment; supervisory control;

    Sammanfattning : Modern gasoline and diesel combustion engines are equipped with several subsystems with the goal to reduce fuel consumption and pollutant exhaust emissions. Subsystem synergies could be harnessed using the supervisory control approach. Look-ahead information can be used to potentially optimise power-train control for real time implementation. LÄS MER