面临日趋严格的汽车尾气排放标准,采用同时进行CO和烃类氧化,NOx还原的Pt/Rh系三效催化剂是一种有效的解决办法.在汽车污染控制中使用助催化剂CeO2,是今天稀土氧化物最重要的应用,Ce3+/Ce4+在氧化/还原条件下可以贮存/释放氧,扩宽了中心接近化学计量的催化剂活性工作带,氧化铈促进反应物分子的活化而降低反应温度.当前三效催化剂中,采用CeO2-ZrO2混合氧化物反映了发展紧偶催化剂的最先进的工艺.含少量Ru、Rh、Pt等贵金属的稀土钙钛矿型氧化物有可能发展成实用的净化汽车尾气三效催化剂.
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