The effect of SiO2 porosity on activity profiles and comonomer incorporation in slurry ethylene/butene‐1 polymerization by (SiO2/MgCl2/TEOS/TiCl4) catalyst system

摘要: To investigate the influence of support porosity parameters e.g., average pore volume (APV), diameter (PD), and surface area distribution (PSAD) on activity-profile catalyst comonomer incorporation, a series silica-supports with different were prepared through sol–gel method used to synthesize corresponding (SiO2/MgCl2/TEOS/TiCl4) catalysts. Polymerization ethylene/butene-1 showed that increasing APV from 0.75 2.2 cm3 g increase initial activity 120 400 (gpoly/gcat.bar.hr) followed by appearance secondary peaks in which could be attributed variation PSAD. It is found effect polymerization complicated issue depends not only also concentration. The PD 300 A gives higher incorporation polymers 15–20% lower crystallinity contrast 100 A. Porosity was quantitatively studied modifying conventional Z-N mechanism introducing fragmentation term achieve new tool designing developing polyolefin © 2011 Wiley Periodicals, Inc. J Appl Polym Sci,