富H2/CO2气氛下CuO-NiO/CeO2催化CO-PROX性能的研究

富H₂/CO₂气氛下CuO-NiO/CeO₂催化CO-PROX性能的研究

摘要: 采用分步浸渍法制备CuO-NiO/CeO₂催化剂，通过XRD、BET、H₂-TPR、Raman和XPS手段对催化剂进行表征，探究NiO-CeO₂前驱体焙烧温度对催化剂物化性质及富H₂/CO₂气氛下CO选择性氧化性能的影响。结果表明，前驱体焙烧温度主要影响催化剂的还原性能和氧空位的含量。当焙烧温度为500 ℃时，催化剂中氧空位的含量较高，其催化性能较好。在反应温度为130 ℃，氧过量系数为1.2，空速为20266 mL/(g·h)时，CO转化率为95.9%，CO氧化选择性为86.3%。

Abstract: The CuO-NiO/CeO₂ catalyst was prepared by step impregnation method. The catalyst was characterized by XRD, BET, H₂-TPR, Raman and XPS, and the effects of the calcination temperature of NiO-CeO₂ precursor on the physicochemical properties of the catalyst and the selective oxidation of CO in H₂/CO₂ rich atmosphere were investigated. The results showed that the precursor calcination temperature mainly affected the reduction performance and oxygen vacancy content of the catalyst. When the calcination temperature is 500 ℃, the content of oxygen vacancy in the catalyst is higher, and the catalytic performance is better. When the reaction temperature is 130 ℃, the oxygen excess coefficient is 1.2, and the air speed is 20266 mL/(g·h), the CO conversion rate is 95.9%, and the CO oxidation selectivity is 86.3%.