采用一种新型的、耐高温和具有大比表面积的氧化铝为载体,制备了Pt-Rh密偶催化剂,并用其催化控制汽车冷启动期间的尾气排放.实验结果表明,该催化剂对汽车尾气(特别是尾气中的烷烃)具有较高的催化活性,同时催化剂还具有很好的抗高温老化性能,完全能够满足高性能密偶催化剂的要求. A new type of Pt-Rh close-coupled catalyst was prepared by using a new type of alumina with high temperature resistance and large specific surface area. The catalyst was used to control the tail gas emission during the cold start-up of the vehicle. The experimental results showed that the catalyst exhibited good catalytic activity on the tail gas Especially the exhaust gas alkane) has a high catalytic activity, while the catalyst also has good resistance to high temperature aging performance, fully able to meet the requirements of high performance close-coupled catalyst.