800
C. By combination of IR, XANES, and EXAFS, they explained that the higher
polymerization activity over CrO 2 Cl 2 grafted onto silica pretreated at 800
C was
related to the more strained six-membered chromasiloxane rings. Thu ¨ne et al. [115]
Scheme 9 Heterogeneous models reported in the literature for the Phillips Cr/silica catalyst
164
R. Cheng et al.
C. By combination of IR, XANES, and EXAFS, they explained that the higher
polymerization activity over CrO 2 Cl 2 grafted onto silica pretreated at 800
C was
related to the more strained six-membered chromasiloxane rings. Thu ¨ne et al. [115]
Scheme 9 Heterogeneous models reported in the literature for the Phillips Cr/silica catalyst
164
R. Cheng et al.