【摘要】 采用等体积浸渍法制备了以CeO2、Al2O3以及CeO2/Al2O3为载体的负载型CuO催化剂及其老化样品,采用XRD和H2-TPR等技术对老化前后催化剂的结构和氧化还原性能进行了表征。结果显示,对于老化前后的CuO/CeO2/Al2O3催化剂,CuO均能够很好地分散在载体上,即CeO2/Al2O3具有较好的抗烧结能力。考察了不同载体、CeO2和CuO负载质量分数对CuO/CeO2/Al2O3样品三效催化性能的影响,并将制得的CuO/CeO2/Al2O3催化剂与贵金属三效催化剂Pd/CeO2/Al2O3相比较,考察了高温焙烧之后的CuO/CeO2/Al2O3老化样品对CO、C3H6和NO的三效催化性能。结果表明,以10%CeO2/Al2O3为载体,CuO负载质量分数为7%的CuO/CeO2/Al2O3催化剂对汽车尾气脱除催化反应具有较高的催化活性;与Pd/CeO2/Al2O3比较,CuO/CeO2/Al2O3具有更好的低温活性,CO、HC和NOx的起燃温度分别为130℃、250℃和250℃,在350℃三种原料气的转化率均达到90%;老化实验表明,CuO/CeO2/Al2O3具有较好的抗老化性能。更多还原

【Abstract】 A series of supported CuO catalysts and its aged samples,using CeO2,Al2O3 and CeO2/Al2O3 with different loading of CeO2 as the supports,were prepared by impregnation method.Characterization of their structure and redox properties by XRD and H2-TPR showed that CuO were well dispersed over CeO2/Al2O3 support both in fresh and aged CuO/CeO2/Al2O3 catalysts,indicating that the catalysts had good resistance to sintering.Effects of different supports and loadings of CeO2 and CuO were investigated and comparison was made between CuO/CeO2/Al2O3 and Pd/CeO2/Al2O3.The three-way catalytic activity of aged CuO/CeO2/Al2O3 catalyst calcined at high temperature was tested.The results showed that CuO/CeO2/Al2O3 catalyst with CuO loadings of 7% and supported on 10%CeO2/Al2O3 exhibited superior three-way catalytic activity,with superior activity to that of Pd/CeO2/Al2O3 especially at lower temperature and light-off temperature for CO,HC and NOx of 130 ℃,250 ℃ and 250 ℃,respectively,and conversion of 90% for the three pollutants at 350 ℃.CuO/CeO2/Al2O3 also exhibited good resistance to aging.更多还原