摘要
以金属硝酸盐为原料、碳酸钠为沉淀剂,采用共沉淀法制备了一系列Cu0.1Ce0.9-xAlxOy复合氧化物催化剂,并用低温氮气吸附/脱附、X-射线衍射(XRD)和氢-程序升温还原(H2-TPR)等对样品进行了表征,利用微反-色谱评价装置考察了催化剂对CO低温氧化反应的活性,研究了Al含量(x=0～0.3)和催化剂焙烧温度(350、500和650℃)对Cu0.1Ce0.9-xAxOy催化活性的影响。结果表明,随着催化剂中Al含量(x)的增加,Cu0.1Ce0.9-xAlxOy的催化活性先提高,至x=0.1时达到最大,之后又逐渐降低;当催化剂的焙烧温度为500℃时,Cu0.1Ce0.8Al0.1Oy的催化活性最大。Cu0.1Ce0.9-xAlxOy的催化活性与其CuO的还原性之间有较好的对应关系。
A series of Cu0.1Ce0.9-xAlxOy catalysts were prepared by co-precipitation using metal-nitrates and sodium carbonate as raw materials and precipitating agent, respectively. The obtained catalysts were characterized by low temperature N2 adsorption/desorption, XRD and H2-temperature-programmed reduction （H2-TPR） techniques. Their catalytic activities for the low temperature oxidation of CO were evaluated by using a microreactor-GC system. The effects of Al content and catalyst calcination temperature on the activity of the Cu0.1Ce0.9 -xAlxOy catalysts were investigated. The results show that the catalytic activity of the prepared Cu0.1Ce0.9-xAlxOy increases firstly with Al content, reaches a maximum at x=0.1, and then decreases. On the other hand, the CO conversion reaches a maximum over the Cu0.1Ce0.8Al0.1Oy catalyst calcined at 500 ℃. The activity of the Cu0.1Ce0.9-xAlxOy catalyst for CO oxidation is well correlated with the reducibility of CuO.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2010年第9期1639-1645,共7页
Chinese Journal of Inorganic Chemistry
基金
上海市教委重点学科建设项目(NoJ51503)
上海应用技术学院研究生创新能力培养专项资金项目(NoYC200906)
上海应用技术学院科技发展基金(NoKJ2008-01)资助
