In this study a series of the CuO-doped materials containing zeolite with varying CuO contents were synthesized from red mud (RM) and rice husk ash (RHA). The rice husk ash/ red mud with the molar ratio of SiO 2 /Al 2 O 3 , Na 2 O/SiO 2 and H 2 O/Na 2 O being 1.8, 2.5 and 60, respectively, were maintained during the synthetic process of materials. The characteristic structure samples were analyzed by x-ray diffraction (XRD), Fourier transformed infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscope (TEM), Brunauer-Emmett-Teller (BET) surface area and H 2 temperature program reduction (H 2 -TPR). The catalytic activity of samples was evaluated in CO oxidation reaction in a microflow reactor at temperature range 200 °C-350 °C. The obtained results showed that all synthetic samples there exist the A-type zeolites with the average crystal size of 15-20 nm, the specific surface area of 21.3 − 54.3 m 2 g −1 , and pore volume of 0.073 − 0.130 cm 3 g −1 . The material synthesized from RM and RHA with the zeolite structure (ZRM, undoped CuO) could also oxidize CO completely at 350 °C, and its activity was increase significantly when doped with CuO. CuO-doped materials with the zeolite structure exhibited excellent catalytic activity in CO oxidation. The ZRM sample loading 5 wt% CuO with particle nanosize about 10-30 nm was the best one for CO oxidation with complete conversion temperature at 275 °C.
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