Реферат: By using 14CO quenching method the number of active centers (CP) and propagation rate constants (KP) at ethylene polymerization with homogeneous catalyst LFeCl2 and supported catalysts LFeCl2/MgCl2, LFeCl2/SiO2 and LFeCl2/Al2O3 (L: 2,6-(2,6-(Me)2C6H3N=CMe)2C5H3N) have been determined. Al(i-Bu)3 as a cocatalyst was used in these experiments. For homogeneous complex the sharp decay of polymerization rate is observed: activity decreases in 10 times for 10 min at 350C. It is found Cp value consists 41% of Fe at the initial stage of polymerization and decreases to 16% for 10 min. At the same time the propagation rate constant decreases from 2.6.104 to 0.82.104 L/(mol.s). For all supported catalysts the polymerization rate is stable with polymerization time (70oC). We have found the number of active centers consists the small portion (2 – 4 %) from the total Fe content in catalysts. The KP values (700C) are equal to 3.2.104, 3.4.104 and 4.5.104 L/(mol.s) in the case of supports MgCl2, SiO2 and Al2O3, respectively. The gel-permeated chromatography data on molecular weight distribution of all polymers were obtained too.

Библиографическая ссылка: Барабанов А.А. , Букатов Г.Д. , Захаров В.А.
Число активных центров и константы скорости роста при полимеризации этилена на катализаторах на основе 2,6-бис(имино)пиридильного комплекса железа (II)
Каталитический дизайн – от исследований на молекулярном уровне к практической реализации : 2-я Международная школа-конференция молодых ученых по катализу 25-29 июл. 2005