Preparation of ceria-zirconia sub-catalysts for automotive exhaust cleaning

This paper focuses on the development of ceria-zirconia materials which have high thermal stability and high catalytic activity. The CeO(2)-ZrO(2) system is very important as a sub-catalyst in the autoexhaust catalytic converters, especially on the oxygen-storage capacity (OSC). The role of the CeO(2)-ZrO(2) is to adjust the air-fuel ratio to the stoichiometric value to attain the simultaneous conversions of the three main pollutants such as CO, NO(x) and hydrocarbons, by providing and absorbing oxygen during fuel-rich and fuel-lean conditions, respectively. In this article, recent advances in the design and development of the sub-catalysts in the autoexhaust catalytic converters are reviewed. (C) 2000 Elsevier Science S.A. All rights reserved.