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Controlling diesel NOx & PM emissions using fuel components and enhanced aftertreatment techniques: developing the next generation emission control system

Gill, Simaranjit Singh (2012)
Ph.D. thesis, University of Birmingham.

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Abstract

The following research thesis focuses on methods of controlling nitrogen oxides (NO\(_X\)) and particulate matter (PM) emissions emitted from a low temperature diesel exhaust. This involves studying the influence of hydrogen (H\(_2)\) on various aftertreatment devices such as hydrocarbon selective catalytic reduction (HC-SCR) over silver-alumina (Ag-Al\(_2\)O\(_3\)) catalysts for lean NO\(_X\) reduction, platinum diesel oxidation catalysts (DOC) for nitrogen dioxide (NO\(_2)\) production and passive regeneration methods for the diesel particulate filter (DPF). H2 was implemented on-board either through diesel exhaust gas fuel reforming or via the simulation of ammonia (NH\(_3\)) dissociation. Both methods showed to be very effective in enhancing the activity of a silver HC-SCR catalyst for the reduction of NO\(_X\) with conversions reaching 90% with the aid of an upstream DPF. A combined DOC and catalysed DPF (cDPF) configuration proved promising for passive regeneration in the presence of reformed exhaust gas recirculation (REGR). The addition of H\(_2\) over the DOC led to an improved catalyst light-off temperature and increased rate of oxidation for NO\(_2\) production. Implementing filtered EGR (FEGR) removes the hydrocarbon (HC) and soot recirculation penalty, thus minimising particulate growth which results in a significantly reduced engine-out soot emission during exhaust gas recirculation (EGR) and hence, an improved NO\(_X\)/soot ratio. Introducing fuel components which enhance the cetane number and oxygenate the diesel fuel allow better control of the NO\(_X\)/soot trade-off with improved soot oxidation properties.

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:GE Environmental Sciences
TJ Mechanical engineering and machinery
TL Motor vehicles. Aeronautics. Astronautics
TS Manufactures
Institution:University of Birmingham
ID Code:3643
This unpublished thesis/dissertation is copyright of the author and/or third parties.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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