Bimetallic Aluminum Complexes Modified withChloride Ions of Mn (II), Fe (III), and Ni (II) forPyrocondensate Oligomerization

摘要

The oligomerization process of pyrocondensate fraction was performed in the presence of catalytic systems which were synthesized by the reaction of aluminium metal (Al) and dichloroethane (DCE) as the basic catalyst and after that were modified with metal chloride of Mn (II), Fe (III), and Ni (II) in the mode of ?in situ?. The synthesized bimetallic catalytic systems showing higher activity in the oligomerization process of unsaturated hydrocarbons in the pyrocondensate fraction simultaneously, allow reducing the catalyst consumption twice, increaseing the molecular weight and softening temperature of the produced petroleum resins. In order to study the composition of the catalytic systems and the effect of the nature of transition metal ions on the catalytic sites of the system, they have been investigated by Dynamic light scattering (DLS), Electron paramagnetic resonance (EPR), X- ray floroscene microscopy XRF and thermal analyses TG/DTG/DTA techniqes. The results revealed that the formed carbon particles during the synthesis process have paramagnetic properties characteristic with delocalized electrons, and the coordination interaction with metal salts form dispersed clusters of AlClx-MeCly/C systems with bimetallic centers. The preservation of the activity of these catalytic systems for a long time is due to the nanoscale carbon particles generated in the system which play an important role as active centers.