Fe对肉桂醛选择性加氢催化剂Co/硅藻土的修饰作用

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。

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

The modification function of iron on Co/diatomite catalyst for selective hydrongenation of cinnamaldehyde(UAL) to cinnamyl 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（mol/mol），UAL conversion was increased from 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.