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- W4286501696 abstract "Abstract In this work, novel imido‐Cr/silica catalysts are synthesized by modifying the Phillips catalyst CrO x /silica with isocyanates. The imido‐Cr/silica, which has moderate activities of 200–300 kgPE molCr −1 bar −1 , shows lower efficiency than CrO x /silica for C 2 H 4 polymerization. On the other hand, regarding to the modified catalysts, the productivity can be improved almost linearly with increasing C 2 H 4 pressure, and very stable activities are observed during the 1 h run of C 2 H 4 polymerization. When compared with CrO x /silica, the modified catalysts can produce polyethylene (PE) with much higher molecular weight (MW) and broader molecular weight distribution (MWD), which is featured by a distinct ultrahigh MW shoulder. Meanwhile, the MW and MWD of the PE products can be reduced obviously by adding a small amount of H 2 before C 2 H 4 polymerization. In addition, it is found that more 1‐hexene can be copolymerized by CrO x /silica, and it is preferentially incorporated into a portion of the PE chains. While such a preference is much less significant for the modified catalysts." @default.
- W4286501696 created "2022-07-22" @default.
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- W4286501696 date "2022-09-04" @default.
- W4286501696 modified "2023-10-17" @default.
- W4286501696 title "Novel Imido‐Cr/Silica Ethylene Polymerization Catalysts Modified from the Phillips Catalyst" @default.
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- W4286501696 doi "https://doi.org/10.1002/mren.202200025" @default.
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