汽车尾气净化用三效催化剂

三效催化剂指同时具备催化氧化、催化还原和催化氧化还原三种效能的催化剂。该催化剂以铑、铂和钯为活性组份；以铈、镧、钡和锆为助剂；其载体形状有整体式和颗粒状两种。分别介绍和讨论了其活性组份、助剂与载体的组成和性能。添加稀土可有效地改善三效催化剂的性能，降低贵金属用量。

The three way conversion catalyst for purificationof tail gas of automobile

The three way conversion catalyst(TWC)was provided with three functions of catalytic oxidation,catalytic reduction and catalytic oxido reduction,which contained Rh,Pt,Pd as active constituents,Ce,La,Ba,Zr as coagent The shape of its supporter can be entirety or granular The composition and performance of active constituent,coagent and supporter were introduced and discussed respectively Adding rare earth elements was conduced to improving the performance of TWC and reducing the amount of nobel metals