Abstract
Volatile organic compounds (VOCs) not only pollute the environment, but also seriously damage human health. Studies have shown that CeO2 doped with Cr and other metal elements can significantly improve its catalytic activity. In this paper, MIL-101 (Cr) was selected as the precursor of Cr2O3, and x wt%Cr2O3/CeO2 catalysts (x = 5, 10, 15) with different loadings were prepared by impregnation method. The physicochemical properties of the catalysts were characterized by XRD, SEM, BET, XPS and H2-TPR, and their catalytic performance was evaluated by toluene catalytic combustion. The results show that 10 wt%Cr2O3/CeO2 exhibits the best catalytic activity for toluene combustion, and the conversion of toluene can reach 90% at 263 °C. This can be attributed to the relatively high specific surface area (118 m2 g−1), the highest surface adsorbed oxygen content (Oads/Ototal = 0.251), oxygen vacancy content, more surface Ce3+ species and Cr6+ species, and the best low-temperature reducibility.
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