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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. Tsolakis, Athanasios Colleges (2008 onwards) > College of Engineering & Physical Sciences School of Mechanical Engineering GE Environmental SciencesTJ Mechanical engineering and machineryTL Motor vehicles. Aeronautics. AstronauticsTS Manufactures University of Birmingham 3643
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