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为满足越来越严格的汽车尾气排放标准且有效降低冷启动时碳氢化合物(HC)排放以及解决神龙、奇瑞车型在冷启动时钯基催化剂的碳氢吸附(HCA)性能消失的缺点,重点探究了所制备的HCA催化剂在发动机台架上的催化性能、HC吸附性能以及其在整车上的应用。在本研究中,采用沸石和贵金属连接体的Pd/I-Ce-HZSM-5为HCA材料的主要组分,对神龙和奇瑞车型而言,其排放结果表明:冷启动时,Pd/I-Ce-HZSM-5型HCA催化剂对HC捕集效果明显优于传统方式制备的催化剂,由于钯基催化剂具有良好的起燃特性,碳氢吸附的连接体及低起燃性使得Pd/I-Ce-HZSM-5催化剂的碳氢排放进一步减少。冷启动20~30 s时,沸石负载钯基催化剂的碳氢吸附量最大。HCA材料对于满足高标准的低温HC排放质量方面具有很大的研究潜力。
In order to meet the increasingly stringent vehicle exhaust emission standards and effectively reduce hydrocarbon emissions during cold start-up and to resolve the shortcomings of the HCA performance of Palladium-based catalysts disappearing at cold start in the Shenlong, The catalytic performance of the prepared HCA catalyst on the engine bed, HC adsorption performance and its application in the vehicle were explored. In the present study, Pd / I-Ce-HZSM-5 zeolites and precious metal linkers were the major components of HCA. For the Shenlong and Chery models, the emission results show that Pd / I- The catalytic effect of Ce-HZSM-5 type HCA catalyst on HC capture is better than that of the traditional method. Because Pd-based catalyst has good light-off characteristics, the hydrogen adsorption linker and low ignition resistance make Pd / I-Ce Hydrogen emissions from HZSM-5 catalyst are further reduced. At 20 ~ 30 s cold start, the zeolite - supported palladium - based catalyst has the largest amount of adsorbed hydrogen. HCA materials have great research potential for meeting the high quality HC emissions at low temperatures.