新型铂前驱体对汽车尾气净化催化剂活性的影响

The Effect of the New Platinum Precursor on the Activity of Automotive Emission Purification Catalyst

贵金属前驱体与贵金属在载体上的分散性和稳定性有密切的关系 ,直接影响催化剂的催化活性和耐久性。作者筛选出一种不含氯的铂化合物 ,并作为铂的前驱体制成催化剂 ,经模拟配气评价 ,分析了此催化剂在热老化前后对NOx、HC和CO三种气体的催化转化效率和起活温度 ,并和以H2 PtCl6 为前驱体制成的催化剂进行了对照。结果表明 ,这种筛选出来的铂化合物完全可以取代H2 PtCl6 作为一种新型的铂前驱体。

Noble metal precursors, which are connected with the PM dispersion and stability of catalyst, have directly effect on the catalytic activity and durability of catalyst. A chlorine-free platinum compound(X) was chosen and used as a platinum precursor to produce the catalysts before or after heat aging, the catalytic conversion efficiencies and the light-off temperature for NO_x, HC and CO were evaluated by simulating vehicle emission gases method, and the results were contrasted with those of the catalysts being produced by the H_2PtCl_6 precursor. It is claimed that the chosen platinum compound can substitute for H_2PtCl_6 as a new precursor.