Thermal treatment of microspherical MgCl2.mEtOH.nH2O adduct as a support for preparation of polyolefin catalysts

MgCl2.mEtOH.nH2O was studied by thermal partial dealcoholation in temperature gradient from 50 to 150 oC. Different techniques such as DSC, TGA and XRD applied to investigate structure changes during thermal treatment. The results showed that partial dealcoholation has great influence on crystal size and distribution, surface area, porosity and polymerization activity in corresponding supports and catalysts. So with dealcoholation to initial 15 W%, DSC peaks illustrate melting peaks of 55 oC and 75 oC have been vanished and a new smaller peak appears at near 101oC. Also parallel analysis by XRD spectroscopy show changes in 2θ and intensity of peaks where by progressing of dealcoholation, peaks of 2θ between 8-9o becomes weaker and weaker and a new peak at 2θ 6-7o begin to appear. Catalyst prepared by this adducts shows improving in morphology stability but adverse effect on activity which does not need any preliminarily polymerization

کلیدواژه ها:

MgCl2 ethanol adduct ، dealcoholation ، Crystallinity ، Catalyst ، polymerization