Abstract
In this contribution, we investigated the key factors for the successful preparation of methylaluminoxane (MAO) from CO2 and Me3Al by analyzing the reaction intermediates and by‐products. The preparation of MAO, which possesses high cocatalytic ability, requires a precise amount of CO2 feed. GC–MS and NMR analysis of the product suggested that tert‐butoxyaluminum species was a key intermediate, which guaranteed the involvement of CO2 in the formation of MAO. The prepared MAO can be applied as a cocatalyst in propylene polymerization using zirconocene, titanocene, nickel, and iron catalysts; its performance as cocatalyst reached to almost the same level as that of the commercially available MAO. Considering that currently olefin monomers require thorough removal of CO2 before polymerization, this method can open the way to omitting some purification processes in the polyolefin industry.
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