Abstract
A series of nanostructured CeO2-ZrO2-Y2O3-La2O3 quaternary solid solutions (CZ-C10, CZ-C12, CZ-C14 and CZ-C16) were synthesized by simultaneous co-precipitation method with the assistance of alkyl acids CnH2n+1COOH (n=9, 11, 13 and 15). The obtained materials exhibit greatly enhanced oxygen storage capacity, textural properties and thermal stability. After aging at 1000°C, CZ-C12-a presents a high surface area of 47m2g−1 and a large cumulative pore volume of 0.28mLg−1. A comparison between CZ-C12 and the commercial material SO-2 in terms of the catalytic performance of supported Rh-only three-way catalysts indicates that Rh/CZ-C12 owns significantly higher catalytic activity than Rh/SO-2. After aging at 1050°C for 12h, the light-off temperatures (T50) of C3H8, CO and NO for Rh/CZ-C12-a are 314°C, 263°C and 322°C, respectively, which are much lower than those (360°C, 290°C and 386°C) for Rh/SO-2-a.
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