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中文摘要：
采用浸渍法制备了一系列低Pt、Rh含量的Pt-Rh型汽车尾气净化催化剂。研究了在Pt、Rh含量一定以及其他条件不变的情况下，只改变铑在不同载体上的分配比对催化剂性能的影响，测定了催化剂对C3H8、CO、NO的起燃温度，并对催化剂样品进行了程序升温还原（H2-TPR）、程序升温脱附（O2-TPD）表征。结果表明：新鲜催化剂对C3H8、CO、NO的起燃温度相差不大，但经过1000℃（3、5h的水热老化后，催化剂性能发生了显著的变化，C3H8、CO、NO的起燃温度出现较大的差异，说明了铑在不同载体上的分配比对催化剂性能有一定影响，特别是对催化剂的抗老化性能影响较大。
英文摘要：
A series of low Pt-Rh catalysts for automobile exhaust purification was prepared by dipping method. The effect of distribution ratio of Rh on two different supports on catalytic per- formance of the low Pt-Rh three way catalysts was investigated and the light-off temperatures of hydrocarbon and carbon monoxide and nitrogen oxides were measured. The catalysts were characterized by means of the temperature-programmed reduction（TPR） and the temperature- programmed desorption（TPD）. The results of the test showed that the light-off temperatures of hydrocarbon and carbon monoxide and nitrogen oxides have little difference for the fresh catalysts, but for the catalysts treated by the hydrothermal-ageing for 5 hours at 1000℃ the great differences in the light-off temperature are observed. The best ratio of Rh on different supports can improve the property of the catalysts, specially, the anti-aging property.
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