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.
出处
《工业催化》
CAS
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)
关键词
催化剂工程
Fe改性
选择加氢催化剂
肉桂醛
肉桂醇
catalyst engineering
iron modification
selective hydrogenation catalyst
cinnamaldehyde
cinnamyl alcohol
