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- W1972056545 abstract "The kinetics of methane liberation during polymethylalumoxane (MAO) interaction with zirconocenes Cp2ZrCl2, Ind2ZrCl2, Me2SiCp2ZrX2, Me2SiInd2ZrX2, and Me2SiCp*NtBuZrX2 (X=Cl, Me), were studied in a wide range of metallocene concentration (1×10−3–1×10−5 mol/l) and Al/Zr ratio (100–24 000) at the narrow range of MAO concentrations (0.1–0.3 mol/l). The reaction of methane liberation follows apparent first order on zirconium. The total methane yield is suggested to be determined by active aluminum species present in MAO, so that [CH4]∞ being ∼0.01 [Al] both in reactions of MAO self-condensation and those catalyzed by dissolved zirconocenes. Comparison of the kinetic parameters of the reaction derived in the presence of zirconocenes shows considerable increase in both specific initial rates of methane liberation and the specific methane yield (per mole of zirconium) at metallocene concentration lower than 1×10−4 mol/l. Multiple regeneration of metal–carbon (MC) bonds was revealed. According to the data of analysis of the effect in terms of dissociative equilibrium, the active species that catalyze the reaction of condensation of MAO are cationic particles. It has been demonstrated that the kinetic parameters of the reaction were also sensitive to the nature of zirconocene." @default.
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- W1972056545 date "2000-05-01" @default.
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- W1972056545 title "Interaction of zirconocenes with polymethylalumoxane. Kinetics of methane liberation" @default.
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- W1972056545 doi "https://doi.org/10.1016/s1381-1169(99)00396-9" @default.
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