Both sintering and catalytic behavior of noble Pt-Rh catalysts, which were prepared by impregnation and sol-gel techniques and aged in a simulated exhaust gas, were investigated. After ageing at 900 ℃and 1200℃, the temperature at which 50% pollutions can be converted (T50) to SG catalyst is 30 ℃ lower than that of IM catalyst. By the comparisons of the specific surface area, XRD and TEM results between the two kinds of three-way catalysts, the sol-gel catalyst shows specific netty microstructure. The netty ...
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