Abstract
A series of CuO/CZ catalysts with different amounts of copper oxide were synthesized from copper nitrates by incipient wetness impregnation of the ceria–zirconia support. The structural, redox, acidic and adsorption properties were investigated using X-ray diffraction (XRD), BET, H2 temperature programmed reduction (H2-TPR), temperature programmed desorption of NO in the presence of oxygen (NO-TPD) and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The results have shown good catalytic activity for CuO/Ce0,62Zr0,38O2 in NO oxidation to NO2. Species such as nitrites and nitrates were formed on the surface. The transformation of nitrite compounds into nitrate was observed above 200 °C. From 300 up to 400 °C, decomposition of the surface nitrate to nitrite was discerned. Ammonia was adsorbed on the Lewis and Bronsted acid sites on Cu/CZ catalyst surface during temperature programmed reactions. The evolution of adsorbed NH3 species to NH2 surface group was confirmed by formation specific band of absorption at 1528 cm−1.
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