TWC-equipped exhausts are widely used in gasoline-fueled vehicles to meet stringent emission regulations.The main components in TWCs are precious metals such as palladium (Pd),platinum (Pt),and rhodium (Rh) as the active component,and inorganic oxides such as γ-alumina (Al2O3),ceria (CeO2),zirconia (ZrO2) and ceria-zirconia (CeO2-ZrO2) are used as the support.Interaction of precious metals and support plays an important role in the thermal stability and catalytic performance of TWCs.The support can improve the dispersion of precious metals and suppress the sintering of precious metals at high temperature.In the same,precious metals can also enhance the redox performance and oxygen storage capacity of support.This paper reviews the reaction phenomenon and mechanism of precious metals (Pt,Pd,Rh) and supports such as Al2O3,CeO2-based composite oxides.
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