engleski

MOx-CeO2-Al2O3 catalysts for soot oxidation process

Ceria (CeO2) is used in a doped or mixed oxide form in catalytic diesel particulate filters (CDPF) as a catalyst for direct soot oxidation process. Soot particles pose a serious threat to human health and the environment, so their successful elimination from automobile exhaust gas is of great importance. In this work, CeO2- Al2O3, MnOx-CeO2-Al2O3 and CuO-CeO2-Al2O3 mixed oxides were prepared by combustion synthesis using glycine as fuel and metal nitrates as oxidants. Samples were characterized using X-ray diffraction analysis (XRD), differential thermal and thermo-gravimetric analysis (DTA-TGA), Fourier transformed infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). According to XRD, only the sample CuO-CeO2-Al2O3 was crystalline after the synthesis, while the remaining samples were amorphous. FTIR analysis showed the presence of residual nitrates in all samples. Consequently, samples were thermally treated at 800 °C for 2 hours, which resulted in mixed oxides with CeO2 and γ-Al2O3 as dominant phases and crystallite sizes in the nano range. The catalytic activity test showed that all three samples exhibit good catalytic activity in the soot oxidation process.

Ceria ; Mixed oxides ; Combustion synthesis ; Soot oxidation

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