碱金属掺杂对Cu/SiO_2催化剂环己醇脱氢的影响  

Effects of Alkali Metal Additives on Cu/SiO_2 Catalyst in the Dehydrogenation of Cyclohexanol

作　　者：吉定豪[1] 王振旅[1] 朱万春[1] 朱小梅[1] 邹秀晶[1] 王国甲[1] 韩富强[2] 

机构地区：[1]吉林大学化学学院,长春130021 [2]营口职业技术学院理化生教研室,辽宁省营口115000

出　　处：《吉林大学学报（理学版）》2007年第2期293-296,共4页Journal of Jilin University:Science Edition

基　　金：国家自然科学基金(批准号:29873019)

摘　　要：采用浸渍法制备了系列碱金属M(M=Li,Na,K,Cs)掺杂的铜基催化剂,铜担载量为5%(质量分数),Cu∶M=5∶1(摩尔比).借助XRD,BET,H2-TPR,NH3-TPD和CO2-TPD对催化剂进行表征,研究了掺杂催化剂对环己醇脱氢反应的影响.结果表明,碱金属物种的引入改变了催化剂表面氧化铜物种的状态和分布;减少了催化剂表面的酸中心数目,有效抑制了脱水副产物的生成,提高了环己酮的选择性(>99%).Cu-K/SiO2催化剂具有良好的催化活性和脱氢选择性,铜和钾添加物间的相互作用抑制了铜粒径长大,增加了抗烧结能力,提高了催化剂的稳定性.A series of Cu-based wet impregnation method. The I catalysts modified with alkali metal M （ M = Li, Na, K, Cs） was prepared via oading of copper was fixed at 5 % （ mass fraction） ; the molar ratio of copper to alkali metal was 5 ： 1. The catalysts were used in the dehydrogenation of cyclohexanol to elucidate the effects of the additives on the catalytic properties of copper. The catalysts were characterized by means of XRD, BET, H2-TPR, NH3-TPD and CO2-TPD. The results indicate that the statuses of copper oxide species on the modified catalysts were changed. The number of acidic sites on the modified catalysts surface was decreased. Accordingly, the selectivity of cyclohexene was remarkably decreased and the selectivity of cyclohexanone was increased （ 〉 99% ）. The Cu-K/SiO2 catalyst showed a highly catalytic activity and a highly selectivity of cyclohexanone. The interaction between copper and K improved the stability of catalyst. additive prevented the growing up of copper, and improved the stability of catalyst.

关 键 词：环己醇 环己酮 脱氢 碱金属 

分 类 号：O643.38[理学—物理化学]