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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.
Supervisor(s):Tsolakis, Athanasios
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Mechanical Engineering
Subjects:TJ Mechanical engineering and machinery
Institution:University of Birmingham
ID Code:3941
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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