Diesel Particulate Filter Regeneration with On-Board Produced Hydrogen-Rich Gas

这项拟议的研究是一项研究的一部分，该研究旨在开发一种柴油发动机减排系统，通过利用废气燃料重整在车上产生的氢气来提高性能。这项研究的动机是柴油发动机满足未来排放法规的要求，以及车载废气燃料改造的潜力，以提供一种改善柴油燃烧和排放以及提高柴油发动机后处理设备效率的方法。该系统的目标是使用柴油氧化催化剂(DOC)和柴油微粒过滤器(DPF)分别实现HC、CO和颗粒物(PM)排放减少90%，使用稀薄NOx催化剂技术(HC-SCR或NH3-SCR或NOx捕集器)实现&gt；70%的NOx减少。该系统必须具有成本效益(即使用贱金属催化剂或减少贵金属催化剂含量)并且应该在不需要开发特定发动机地图的情况下运行。具体地说，本建议的目的是扩展关于PM后处理的科学知识，这将使DPF和重整技术成功地结合在一起。研究展开为两个主要部分：i)研究使用重整油促进碳烟氧化，从而在低排气温度下改善DPF再生(Brunel大学)；ii)研究通过在DPF上游的DOC中添加少量重整油，通过提高低温NO到NO2的转化率来改善DPF再生(伯明翰大学)。通过扩展对NO氧化和过滤器再生过程中基本过程的理解，将设计新的催化剂和催化系统，并为柴油发动机-燃料重整器-后处理系统全面运行的研究方案的进一步阶段制定指导方针。

The proposed research is part of a research study on the development of a diesel engine emissions reduction system with enhanced performance by utilisation of hydrogen produced on-board by exhaust gas fuel reforming. The research is motivated by the requirement of diesel engines to meet future emission regulations and by the potential of on-board exhaust gas fuel reforming to provide a way of improving diesel combustion and emissions as well as increasing the efficiency of diesel engine aftertreatment devices.The system targets are to achieve HC, CO and particulate matter (PM) emissions reduction of >90% using a diesel oxidation catalyst (DOC) and a diesel particulate filter (DPF), respectively, and NOx reduction of >70% using lean NOx catalyst technology (HC-SCR or NH3-SCR or NOx trap). The system will have to be cost effective (i.e. use of base metal catalyst or reduced precious metal catalyst content) and should operate without the need of specific engine map development.Specifically, the purpose of the present proposal is to extent the scientific knowledge on PM aftertreatment assisted by reformate addition that will allow successful integration of the DPF and reforming technologies.The study unfolds into two main parts: i) investigation of the use of reformate to promote the soot oxidation and hence improve the DPF regeneration at low exhaust gas temperatures (Brunel University) and ii) investigation of the improvement of DPF regeneration by soot oxidation with NO2 achieved through promotion of the low temperature NO to NO2 conversion rates in a DOC situated upstream of the DPF by addition of small quantities of reformate (University of Birmingham).By extending the understanding of the fundamental processes occurring during NO oxidation and filter regeneration, new catalysts and catalytic systems will be designed and guidelines for the further stages of the research programme towards a full working diesel engine - fuel reformer - aftertreatment system will be developed.