Hyperpolarised, Gas-phase Magnetic Resonance Imaging of a non-flow through Filter.

了解和改进组合选择性催化还原和过滤整体的设计和操作，以减少静态和运输应用中使用的发动机的排放。将特别关注制造工艺和对过滤器性能的影响。这包括观察含有活性SCR催化剂的涂层在多孔过滤器支撑块的通道和壁内的空间分布。空间分布是至关重要的，因为它影响通过过滤器的废气流动，从而影响系统的压降、过滤效率和催化剂的可及性，从而影响催化剂的活性。为了探测支持通道中的气体流动模式，以及气体通过壁面的渗透，该项目将开发和使用使用超极化(HP)气体的新型气相核磁共振和磁共振成像(MRI)方法。这项工作将考察由于涂层分布不均匀而导致SCR催化剂旁路的可能性。HP Xe MRI还将用于观察通道表面粗糙度(例如，由于涂层沉积)对速度场和壁面剪应力的影响，因为这会影响被过滤烟尘颗粒的颗粒边际效应。该项目还将包括新的核磁共振技术开发。该项目还将有机会在强生马泰公司的开发实验室工作，研究过滤器的涂层输送系统，并开发SCR催化剂涂层配方。这将使学生有机会研究从涂层配方到涂层分配，再到过滤流动特性和性能的整个因果过程。

Understanding and improving the design and operation of combined selective catalytic reduction and filtration monoliths, for reducing emissions from engines used in static and transport applications. Particular focus will paid to the manufacturing process and the impact on the performance of the filters. This includes looking at the spatial distribution of the washcoat, which contains the active SCR catalyst, within the channels and walls of the porous filter support block. The spatial distribution is critical as it affects the exhaust gas flow through the filter, and, thence, the pressure drop of the system, the filtration efficiency, and the accessibility and, thus, activity, of the catalyst. In order to probe the gas flow pattern in the support channels, and the permeation of gas through the walls, this project will develop and use novel gas phase NMR and magnetic resonance imaging (MRI) methods using hyperpolarised (HP) gases. This work will look at the potential for bypassing of the SCR catalyst caused by an inhomogeneous distribution of washcoat. HP Xe MRI will also be used to look at the influence of channel surface roughness (eg due to washcoat deposits) on the velocity field and wall shear stress, as this impacts the particle margination effect for the soot particles being filtered. This project will also include new MRI technique development. The project will also give the opportunity to spend time in the Johnson Matthey company development labs working on the washcoat delivery systems for the filters, and the development of the SCR catalyst-washcoat formulation. This will give the student the opportunity to work on the whole causal progression from washcoat formulation, to washcoat distribution, to filter flow characteristics and performance.