以共沉淀法和贵金属修饰技术,研制了一种新型的稀土基复合催化材料作为车用三效催化剂的催化涂层.通过发动机台架测试技术评价该催化剂的催化活性,并按严格的欧Ⅳ排放法规,通过整车转鼓试验和实车道路试验,评价该催化剂对排放废气的处理能力和耐久性.结果表明,以该催化材料制备的催化剂不仅具有十分优异的起燃特性、空燃比特性和废气处理能力,而且劣化程度低、抗老化能力强,完全可以配合所匹配车型达到欧Ⅳ排放标准的限值要求和耐久性要求.
A new rare-earth-based catalytic material with low loading precious metals, used for catalytic coating of the three-way catalysts was prepared by co-precipitation method and precious metals modifier technology. The catalyst activities were evaluated by engine-bench test technology; their purify capabilities for vehicle exhaust and durability were evaluated by rotary drum test and vehicle road test according to the critical Europe IV emission rule. The results demonstrate that the catalysts prepared by the catalytic material have not only excellent light-off characteristic, air-fuel ratio characteristic, and high purify capability for the vehicle exhaust but also low degradation coefficient and high anti-aging performance, which ensure the vehicle emission level and durability meeting the Europe IV standard requirement for the matching vehicle entirely.
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