Abstract
Mesoporous Ce 1− x Zr x O 2 (m-Ce 1− x Zr x O 2, x = 0.2−0.5) mixed oxides were synthesized by using polyol method. The influences of coefficient x on performances of m-Ce 1− x Zr x O 2 and Cu based catalysts towards CO selective oxidation in H 2-rich gas were investigated. The samples were characterized by means of XRD, Raman, FT-IR, TG, BET, TEM, TPR and TPD techniques. The results showed that all m-Ce 1− x Zr x O 2 samples were mesoporous materials with cubic fluorite-structure, and the highest surface area (181 m 2 g −1) was obtained when the x = 0.5. Compared with CuO/m-Ce 1− x Zr x O 2 ( x = 0.2−0.35) catalysts, the CuO/m-Ce 0.5Zr 0.5O 2 catalyst had higher CO conversion and selectivity in H 2-rich gas, they were 100% and 96.2% at 383 K, respectively. This is explained in terms of its stronger interaction between active ingredient and support, higher dispersion, more active sites, larger CO adsorption amount and lower desorption temperature, which were advantageous to enhance its catalytic activity.
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