Use this URL to cite or link to this record in EThOS:
Title: The application of thermal, catalytic and non-thermal plasma oxidation processes to enhance NO-NO₂ oxidation in the engine exhaust and improve DPF regeneration at lower temperatures
Author: Chong, Jun Jie
ISNI:       0000 0004 2730 1188
Awarding Body: University of Birmingham
Current Institution: University of Birmingham
Date of Award: 2013
Availability of Full Text:
Access from EThOS:
Access from Institution:
Diesel Particulate Filter (DPF) is believed to be one of the most effective methods and provides an efficient system that traps more than 90% of PM. However, the soot accumulated within the filter requires a regeneration process to recover its performance. Thus, the high oxidation ability of NO-NO₂ increases the interest of applying it in the low temperature regeneration process. The intention of this thesis is to investigate several possibilities of on-board NO-NO₂ oxidation methods for increasing the NO₂/NO_x ratio in the exhaust gas. These possible oxidation routes incorporate the in-cylinder to the exhaust gas treatment processes. A wide range of operated temperatures are managed by the application of the non-thermal plasma oxidation (NTP) for low temperatures, catalytic oxidation for moderated temperatures and thermal oxidation for high temperatures studied. The in-cylinder NO oxidation was significantly improved by adding H₂ or the reformed EGR (REGR) to the combustion. The remaining H₂ after the combustion also contributes to the downstream HC-SCR which in turn promotes the NO oxidation. The thermal and NTP methods in the exhaust treatment cannot adequately achieve a satisfactory NO oxidation result under a single occupied condition. The propane (C₃H₈) addition may potentially create useful radicals (HO₂, RO₂) within the system and convert a large portion of NO into NO₂.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: TJ Mechanical engineering and machinery