Ti-HMS的合成和催化苯乙烯环氧化性能研究

Synthesis of Ti-HMS Catalyst And Study on Performance of Catalysis Epoxidizing Styrene

利用中性伯胺(十二胺)作模板剂 ,合成了过渡金属Ti取代的HMS中孔材料。XRD和FT -IR表征表明Ti能有效地嵌入HMS骨架壁中而不会造成其中孔有序度的下降。钛在HMS中的嵌入量是随合成原料Ti/Si的增加而上升的 ,最高可达1.61mmolTi.g-1 HMS。IR中960cm-1 带强度与钛嵌入量呈正比 ,这可能表明960cm -1 是由钛嵌入中孔骨架而引起硅氧四面体结构发生畸变所致。催化实验结果表明 :Ti-HMS能有效地催化叔丁基过氧化氢(TBHP)氧化苯乙烯生成环氧苯乙烷(65 %～86 %)、苯乙醛(6 %～15 %)和苯甲醛(8 %～20%) ,且能重复使用数次而不失活 。

Used primary amine(laury amine)as templating,Ti-HMS is synthesized.XRD and IR show that titanium is effectively embedded into skeleton of HMS,and degree of order of mesoporous doesn't fall down.Embedding content takes direct ration with Ti/Si,and the most one reach to 1.61 mmol·g-1 HMS.The intensity of IR spectrum in 960 cm-1 takes direct proportion to embedding content.It is shown this peak may be caused with distortion of silicon-oxy tetrahedron that titanium atom inlet the mesoporous skeleton.Experiments of catalytic reaction show that Ti-HMS catalyst can effect catalysis the oxidation of styrene by TBHP into epoxy styrene(65%～86%),phenylacetaldehyde(6%～15%)and phenyl aldehyde(8%～20%).Be used repitively without the loss of activity,and reductive condition and reactive condition have a different influence on activity of catalyst and productive distribution.