Abstract of PhD Thesis

The effect of NOx traps on the combustion and size distribution of carbonaceous particulates

Petrica Dulgheru, University College Dublin(2011)

NOx and particulate matter (PM) are two of the more intractable pollutants emitted from diesel engine exhausts. NOx contributes to photochemical smog and acid rain while PM can be carcinogenic and also contributes to global warming through decreasing the albedo of Arctic and Antarctic ice. Neither is removed from the exhaust system using conventional three way catalysts and other technologies are required.

This research focuses on two technologies for removing these pollutants from emissions to atmosphere from diesel-powered vehicles, i.e. NOx Storage and Reduction and Particulate filtration

Chapter 1 offers a brief description of catalysis with applications in environmental protection. The advantages and disadvantages of combining a DPF (to trap PM) and NSR technology (to trap NOx) can be found in section 1.6.

A detailed description of the experimental set-up, analysis techniques and preparation of composite materials can be found in Chapter 2.

The nature and concentration of NOx species stored over composite materials (with various components) is studies in Chapters 3 and 4, while PM oxidation is studies in Chapter 5. The effect of the presence of soot during the storage of NOx was studied in Chapter 6.