CuZnAl类水滑石衍生复合氧化物催化环己醇脱氢反应的研究  

The study on the dehydrogenation of cyclohexanol over complex oxides derived from CuZnAl hydrotalcite-like

作　　者：刘晓红[1] 王丽娜[1] 严凯[1] 张林彬[1] 谢鲜梅[1] 

机构地区：[1]太原理工大学化学化工学院,山西太原030024

出　　处：《化学研究与应用》2009年第9期1250-1254,共5页Chemical Research and Application

基　　金：国家自然科学基金资助项目(50872086);山西省自然科学基金资助项目(2008011018)

摘　　要：采用共沉淀法合成了不同CuZnA l配比的类水滑石,通过不同温度焙烧制备其衍生复合氧化物。采用X-射线衍射(XRD)、差热热重(TG-DTA)、N2吸附-脱附和CO2程序升温脱附法(CO2-TPD)对类水滑石和衍生复合氧化物进行了表征。将所得复合氧化物用于环己醇脱氢制备环己酮的反应中考察其催化活性。实验结果表明:CuZnA l类水滑石衍生复合氧化物对该反应具有很高的催化活性,在反应温度220℃时以CuZnA l[n(Cu)/n(Zn)/n(A l)=1.34/0.66/1.0]类水滑石为前躯体,400℃焙烧所得的衍生复合氧化物表现出最佳的催化活性,环己醇转化率高达94.9%,环己酮的选择性近100%。CuZnAl-HTLcs with different molar ratio were prepared by co-precipitation method with constant pH value, and the derived complex oxides were obtainded through calcining the CuZnAl-HTLcs precursors at different temperature. Modern analysis technology was applied to characterize the samples. They were characterized by the X-ray diffraction （XRD）, Thermogravimetricdifferential thermal analysis （TG-DTA）, N2 -adsorption and desorption, CO2 -Temperature Programmed Desorption （CO2 -TPD）. The derived complex oxides were used as catalysts and applied in the dehydrogenation of eyclohexanol. The catalysts show high catalytical activities in the dehydrogenation of eyclohexanol. The conversion of cyclohexanol can reach 94.9%, the selectivity of cyclohexanone is nearly 100% under the following conditions：the complex oxides derived from CuZnAl-HTLcs [ n（Cu）/n（ Zn）/n （Al） = 1.34/0.66/1.0] catalysts ,calcined temperature 400℃, reaction temperature 220℃.

关 键 词：类水滑石 衍生复合氧化物 环己醇 脱氢 

分 类 号：O611.62[理学—无机化学]