富H_(2)/CO_(2)气氛下CuO-NiO/CeO_(2)催化CO-PROX性能的研究

Study on the catalytic performance of CO-PROX catalyzed by CuO-NiO/CeO_(2) in H_(2)/CO_(2) rich atmosphere

采用分步浸渍法制备CuO-NiO/CeO_(2)催化剂,通过XRD、BET、H_(2)-TPR、Raman和XPS手段对催化剂进行表征,探究NiO-CeO_(2)前驱体焙烧温度对催化剂物化性质及富H_(2)/CO_(2)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%。

The CuO-NiO/CeO_(2) catalyst was prepared by step impregnation method.The catalyst was characterized by XRD,BET,H_(2)-TPR,Raman and XPS,and the effects of the calcination temperature of NiO-CeO_(2) precursor on the physicochemical properties of the catalyst and the selective oxidation of CO in H_(2)/CO_(2) 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%.