Preparation of the Ziegler–Natta/metallocene hybrid catalysts on SiO2/MgCl2 bisupport and ethylene polymerization

Chung, Jin Suk; Cho, Han Seock; Ko, Young Gwan; Lee, Jun Young

doi:10.1016/s1381-1169(98)00335-5

Cited by 47 publications

(7 citation statements)

References 10 publications

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“…The impregnation of MgCl 2 on the SiO 2 surface is usually used to control the morphology of the bi-supported catalyst. MgCl 2 ·nEtOH adduct solution is usually prepared before impregnation on SiO 2 [19,20]. Forte and Coutinho [5] found that the catalyst preparation conditions apparently affected the chemical composition and morphology of catalyst.…”

Section: Introductionmentioning

confidence: 99%

Effect of EtOH/MgCl2 Molar Ratios on the Catalytic Properties of MgCl2-SiO2/TiCl4 Ziegler-Natta Catalyst for Ethylene Polymerization

2011

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MgCl2-SiO2/TiCl4 Ziegler-Natta catalysts for ethylene polymerization were prepared by impregnation of MgCl2 on SiO2 in heptane and further treatment with TiCl4. MgCl2·nEtOH adduct solutions were prepared with various EtOH/MgCl2 molar ratios for preparation of the MgCl2-supported and MgCl2-SiO2-supported catalysts in order to investigate the effect on polymerization performance of both catalyst systems. The catalytic activities for ethylene polymerization decreased markedly with increased molar ratios of [EtOH]/[MgCl2] for the MgCl2-supported catalysts, while for the bi-supported catalysts, the activities only decreased slightly. The MgCl2-SiO2-supported catalyst had relatively constant activity, independent of the [EtOH]/[MgCl2] ratio. The lower [EtOH]/[MgCl2] in MgCl2-supported catalyst exhibited better catalytic activity. However, for the MgCl2-SiO2-supported catalyst, MgCl2 can agglomerate on the SiO2 surface at low [EtOH]/[MgCl2] thus not being not suitable for TiCl4 loading. It was found that the optimized [EtOH]/[MgCl2] value for preparation of bi-supported catalysts having high activity and good spherical morphology with little agglomerated MgCl2 was 7. Morphological studies indicated that MgCl2-SiO2-supported catalysts have good morphology with spherical shapes that retain the morphology of SiO2. The BET measurement revealed that pore size is the key parameter dictating polymerization activity. The TGA profiles of the bi-supported catalyst also confirmed that it was more stable than the mono-supported catalyst, especially in the ethanol removal region.

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Section: Introductionmentioning

confidence: 99%

Effect of EtOH/MgCl2 Molar Ratios on the Catalytic Properties of MgCl2-SiO2/TiCl4 Ziegler-Natta Catalyst for Ethylene Polymerization

2011

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“…At present, most attentions have been paid to the use of supported metallocene complexes [4][5][6][7][8]. Many different materials such as SiO 2 , MgCl 2 , MCM-41, zeolite, carbon, SiO 2 / MgCl 2 and polymer have been used as support for metallocene catalysts in olefin polymerization [9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of agglomerated porous hollow silica supports for olefin polymerization catalyst

Chen

Song

Wen

et al. 2007

Journal of Non-Crystalline Solids

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“…The main reason for this is the lack of suitable functional groups on MgCl 2 structure that hinders the anchoring of the metallocenes on the carrier surface. This particular issue has been addressed before in the case of MgCl 2 , by preparing MgCl 2 /SiO 2 from an agglomerating colloidal phase of SiO 2 with an MgCl 2 solution [27]. The resultant support was then impregnate with metallocene and TiCl 4 to form hybrid heterogeneous catalysts.…”

Section: Introductionmentioning

confidence: 99%

Ethylene polymerization using metallocenes supported on MgCl2/SiCl4−n (n-C6H13O)n

Cérdán

Parada

Ibarra

et al. 2007

Designed Monomers and Polymers

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Abstract-Metallocene complexes Cp 2 TiCl 2 , Cp 2 ZrCl 2 , Cp 2 Zr(N n Bu 2 ) 2 , Cp 2 Ti(η 1 -OC(O)C 6 H 5 ) 2 and Cp 2 Zr(η 1 -OC(O)C 6 H 5 ) 2 were supported on MgCl 2 /SiCl 4−n (n-C 6 H 13 O) n carrier and used for ethylene polymerization. The supported complexes result in highly active catalysts when treated with different aluminum alkyl-based co-catalysts. These catalysts are able of tuning the final properties of the produced polyethylenes. Mixed composites of metallocenes and conventional Ziegler-Natta catalysts supported on the same carrier were also studied. A supported zirconocene Cp 2 Zr(η 1 -OC(O)C 6 H 5 ) 2 on MgCl 2 /SiCl 4−n (n-C 6 H 13 O) n resulted in a highly active catalyst that eject control on the molecular weight, crystallinity and morphology of the resultant polyethylene.

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Preparation of the Ziegler–Natta/metallocene hybrid catalysts on SiO2/MgCl2 bisupport and ethylene polymerization

Cited by 47 publications

References 10 publications

Effect of EtOH/MgCl2 Molar Ratios on the Catalytic Properties of MgCl2-SiO2/TiCl4 Ziegler-Natta Catalyst for Ethylene Polymerization

Effect of EtOH/MgCl2 Molar Ratios on the Catalytic Properties of MgCl2-SiO2/TiCl4 Ziegler-Natta Catalyst for Ethylene Polymerization

Preparation and characterization of agglomerated porous hollow silica supports for olefin polymerization catalyst

Ethylene polymerization using metallocenes supported on MgCl2/SiCl4−n (n-C6H13O)n

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