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

非流通过滤器的超极化气相磁共振成像。

• 批准号: 2167110
• 金额: --
• 依托单位: University of Nottingham
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2019
• 资助国家: 英国
• 起止时间: 2019 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2167110
• 关键词: Hyperpolarised; Gas; phase; Magnetic; Resonance

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.

了解和改进选择性催化还原和过滤一体化组合的设计和操作，以减少静态和运输应用中使用的发动机的排放。特别关注的是制造过程和对过滤器性能的影响。这包括观察多孔过滤器支撑块的通道和壁内的含有活性SCR催化剂的载体涂层的空间分布。空间分布是关键的，因为它影响通过过滤器的废气流，并因此影响系统的压降、过滤效率和催化剂的可接近性，从而影响催化剂的活性。为了探测支撑通道中的气流模式以及气体通过壁的渗透，该项目将开发和使用新型气相NMR和磁共振成像（MRI）方法，使用超极化（HP）气体。这项工作将着眼于由修补基面涂层的不均匀分布引起的SCR催化剂旁路的可能性。还将使用HP MRI来观察通道表面粗糙度（例如，由于涂层沉积物）对速度场和壁面剪切应力的影响，因为这会影响被过滤的烟灰颗粒的颗粒边缘效应。该项目还将包括新的MRI技术开发。该项目还将提供在约翰逊万丰公司开发实验室工作的机会，该实验室致力于过滤器的涂层输送系统，以及SCR催化剂涂层配方的开发。这将使学生有机会研究从涂层配方到涂层分布，再到过滤器流动特性和性能的整个因果关系。