Mathematical modelling of the selective catalytic reduction of nitrogen oxides in combustion products

Manning, Andrew (2022) Mathematical modelling of the selective catalytic reduction of nitrogen oxides in combustion products. Doctoral thesis, Northumbria University.

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Abstract

A novel kinetic scheme is presented which describes the reactions between the gas and surface phases within an Selective Catalytic Reducer (SCR). The kinetic scheme shows the development of active surface sites and their role in the SCR kinetic cycle.
Unlike many other SCR kinetic schemes, this aims to be universally applicable to all catalyst materials. The emphasis being on versatility with a sufficient level of accuracy, rather than just a good level of accuracy for a single catalyst species. As the SCR design process progresses, a more accurate level of accuracy may be required, but during the early design stage, when the catalyst material is not know, this model offers a good design tool.
This is particularly important for modern applications when the number of catalyst materials and variations are growing quickly. The model presented in this work has been compared to experimental results and shows a good level of accuracy when compared to experimental results, particularly at typical SCR operating temperatures, 250-400°C.
The thesis will discuss the development of the model as well as the other factors involved in the SCR process. The results will be compared to experimental values and then the models reaction to changes in operating environment will be analysed.

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