Characterization of a metallocene/co-catalyst system supported on silica by Fourier-Transform Raman spectroscopy

“Bound but Not Gagged”Immobilizing Single-Site α-Olefin Polymerization Catalysts

“…Van der Pol and co-workers studied silica-supported 2,2‘-biphenyl-(2-Ind) 2 ZrCl 2 in the presence of MAO and were able to correlate spectral features to ethylene polymerization activity and Al/Zr ratio. Specifically, a “fairly linear” correlation was found between the signal intensity due to M−Me bonds (M = Al or Zr) and the productivity (kg of PE/mmol of Zr) for a series of samples of differing Al/Zr ratios . A similar correlation between spectroscopy and catalyst performance has recently been disclosed by Brintzinger and co-workers, who have developed a method for determining the activity of a supported metallocene catalyst using UV−vis spectroscopy…”

“…Specifically, a "fairly linear" correlation was found between the signal intensity due to M-Me bonds (M ) Al or Zr) and the productivity (kg of PE/mmol of Zr) for a series of samples of differing Al/Zr ratios. 88 A similar correlation between spectroscopy and catalyst performance has recently been disclosed by Brintzinger and co-workers, who have developed a method for determining the activity of a supported metallocene catalyst using UV-vis spectroscopy. 89…”