Fe对肉桂醛选择性加氢催化剂Co/硅藻土的修饰作用  

Modification of Fe on Co/diatomite catalyst for selective hydrogenation of cinnamaldehyde

作　　者：李万伟[1] 刘自力[2] 

机构地区：[1]湖南怀化学院化学化工系,湖南怀化418008 [2]广州大学化学化工学院,广东广州510006

出　　处：《工业催化》2008年第1期62-66,共5页Industrial Catalysis

基　　金：国家自然科学基金资助项目(20266001)

摘　　要：研究了Fe对负载型选择性加氢催化剂Co/硅藻土上肉桂醛加氢反应的修饰作用。实验结果表明,助剂Fe的加入对肉桂醛的活性和肉桂醇的选择性都有影响,但主要影响体现在催化活性上,选择性影响不明显。当n(Fe)∶n(Co)<0.20,催化活性由60.69%明显提高到80.63%,再提高n(Fe)∶n(Co),活性又降低。结合XRD、SEM和正电子寿命谱等表征手段,结果发现,Fe对Co3O4晶体的完整程度产生影响,导致晶体缺陷数增加,Fe引入使催化剂在载体硅藻土表面分散性更好,分散的单层性更明显,负载在硅藻土上催化剂的晶粒粒径也有变小的趋势。The modification function of iron on Co/diatomite catalyst for selective hydrongenation of cinnamaldehyde（UAL） to cirmamyl alcohol（UOL） was studied. Experimental investigation results showed that addition of small amount of Fe had influence on Co/diatomite, with remarkable influence on conversion of UAL and less influence on selectivity to UOL. When n（ Fe）/n（Co） ≤0.20（tool/tool） ,UAL conversion was increasedfrom 60. 69% to 80.63%, but UAL conversion declined with further increase in n （ Fe）/ n（Co）. XRD, SEM and positron annihilation results indicated that Fe affects perfectness of Co3O4 crystals and leads to increasing crystal defects; Fe also improved dispersion of the catalyst on diatomite surface, with more obvious single layer dispersion and smaller crystal grain size of the catalyst on diatomite.

关 键 词：催化剂工程 Fe改性 选择加氢催化剂 肉桂醛 肉桂醇 

分 类 号：TQ426.4[化学工程] O643.36[理学—物理化学]