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Diesel engine vehicles are attracting increasing interest, primarily due to the high fuel efficiencies and associated reduced CO2 emissions. However, diesel engines also emit various hazardous pollutants such as nitrogen oxides (NOx), CO, hydrocarbons (HCs) and particulate matter (PM), which all cause problems for human health and the environment, and emission regulations are becoming increasingly more rigorous worldwide. A catalytic converter system is one of the most promising solutions to reduce these pollutants in exhaust gases. For example, a typical after-treatment system for heavyduty diesel vehicles consists of diesel oxidation catalyst (DOC), diesel particulate filter (DPF) and NOx selective catalytic reduction (SCR). The DOC has three primary functions in an integrated emission control system: to oxidize CO and HCs in the exhaust1)~3), to burn a large amount of fuel periodically supplied by post-injection for regeneration of the DPF4) and to oxidize NO to NO2 for enhanced low-temperature NOx reduction by SCR5). However, the temperature of exhaust gas emissions from diesel engines has been decreased by the introduction of exhaust gas recirculation (EGR) systems to efficiently reduce engine-exhaust NOx levels. Therefore, the DOC is needed to completely oxidize CO and HCs at low temperatures. The DOC requires relatively large amounts of Pt, which is mainly employed as a catalyst component because of its high performance for hydrocarbon oxidation6)~10). However, reduction in the use of Pt is now gaining extensive attention because the total demand for Pt for automotive catalysts is growing due to increasing environmental awareness11). Extensive research has been performed to improve the activity and durability of DOC12)~15). For example, Agarwal and Spivey16) reported that Ni-doped Pt/ Al2O3 catalyst exhibits high activity and durability for the total oxidation of HCs (mixture of C5-C9 hydrocarbons). Ntainjua et al.17) evaluated the catalytic activity of various supported Pt catalysts (Pt/Al2O3, Pt/TiO2, Pt/ SiO2, Pt/SnO2 and Pt/CeO2) for the total oxidation of naphthalene and found that Pt/Al2O3 and Pt/SiO2 showed high catalytic performance. Addition of Pd to 205 Journal of the Japan Petroleum Institute, 58, (4), 205-217 (2015)

Development of Diesel Hydrocarbon Oxidation Catalysts Aimed at Reducing Platinum Group Metals Usage