This paper introduces some kinds of catalysts for automobile exhaust purification, such as ThreeWay Catalysts (TWCs), perovskite oxide catalyst, and molecular sieve catalyst by metal ions.
Doped rare earth oxides have been widely used in three-waycatalyst(TWC) for purification of automobile exhausts because of its special properties.
稀土元素以其特殊的物理和化学性质在汽车尾气三效净化催化剂（TWC）中获得了广泛应用。
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The petrol composition influent emission of the engine markedly. It is especially important to control petrol composition particularly after threeway conversion catalyst were installed in modern car.