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| Catalytic performance of precious metal-substituted LaCoO3 over soot. |
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Abstract LaCo0.96X0.04O3 (X=Pt、Pd、Rh、Au、Ag) catalysts were prepared by citric method. The catalytic activity of catalysts on soot was determined by thermogravimetry (TG). Catalysts were characterized by temperature-programmed reduction (H2-TPR), X-ray diffraction (XRD), energy dispersive spectrograph (EDS) and Fourier transform infrared spectroscopy (FTIR). The catalytic perfomance of LaCo0.96Ag0.04O3 on soot was the most activated with the ignition temperature of 449℃, lower than 504℃ of LaCoO3. TPR patterns of precious metal-substitued LaCoO3 differed. Diffraction angles of XRD characteristic peaks moved to high angles, meaning the entering of various precious metals in LaCoO3 phase. And energy dispersive spectra showed the contents of various precious metal in perovskite phase varied.
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Received: 02 January 2009
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