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# The application of thermal, catalytic and non-thermal plasma oxidation processes to enhance NO-NO$$_2$$oxidation in the engine exhaust and improve DPF regeneration at lower temperatures

Chong, Jun Jie (2013)
Ph.D. thesis, University of Birmingham.

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## Abstract

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-NO$$_2$$ 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-NO$$_2$$ oxidation methods for increasing the NO$$_2$$/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 H$$_2$$ or the reformed EGR (REGR) to the combustion. The remaining H$$_2$$ 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 (C$$_3$$H$$_8$$) addition may potentially create useful radicals (HO$$_2$$, RO$$_2$$) within the system and convert a large portion of NO into NO$$_2$$.

Type of Work: Ph.D. thesis. Tsolakis, Athanasios Colleges (2008 onwards) > College of Engineering & Physical Sciences School of Mechanical Engineering TJ Mechanical engineering and machinery University of Birmingham 3941
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