纳米催化剂FeCl_3-Al(isobutyl)_3-phenanthroline的制备

Preparation method of nanosized catalyst FeCl_3-Al(isobutyl)_3-phenanthroline

利用透射电镜和聚合实验研究了纳米催化剂FeCl3-Al(i-Bu)3-phenanthroline的制备方法,分析了各组分的比例、加入顺序、老化等因素对其催化活性的影响.实验结果表明,在加氢汽油介质中,当c(Butadiene)=1.85×103 mol/m3,c(FeCl3)/c(Butadiene)=3.0×10-5,c(Al(isobutyl)3)/c( FeCl3)=66,c(phenanthroline)/c(FeCl3)=1.6时,催化剂的粒径小于50 nm,丁二烯转化率可达到98%以上,聚丁二烯的相对分子质量为2.90×107,此为最佳配比.加料顺序为phenanthroline,FeCl3,Al(isobutyl)3,能有效阻止Fe3+被深度还原.老化时间为4 h、老化温度在-15～20 ℃内不影响催化剂活性.

The effects of the ratio and the adding sequence of the catalyst ~ts and aging on the catalyst＇s catalytic activity were discussed. The preparation met method of the FeCl3-Al （isobutyl）3-phenanthroline was studied by transmission electron microscope（TEM） of catalyst and polymerization of butadiene. The results show that the optimum ratio of catalyst components in hydro-gasoline solution isas follows： c（Butadiene） is 1.85×10^3 mol·m^-3,c（FeCl3）/c（butadiene） is 3.0×10^-5,c（Al（isobutyl）3）/c（FeCl3） is 66, c（phenantroline）/c（butadiene） is 1.6. The size of catalyst particles is less 50 nm, the transformation ratio of butadiene is over 98%, the molecular weight of polybutadiene is 2.90× 10^7. Only phenantroline and FeCl3 are added before A1 （isobutyl）3 to prevent Fe^3＋ from reducing to lower valence. So the best order of adding material is the ftrst phenantroline, the second FeCl3, the last Al（isobutyl）3.The catalyst＇s catalytic activity is not affected by being aged for 4 hours at the the from - 15 ℃ to 20 ℃.