Characterization of phthalate internal donor in MgCl2 supported Ziegler-Natta catalyst by solid state 13C NMR

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Saito Masayoshi; Uozumi Toshiya; MURATA MASAHIDE; Kataoka Takuo; Chujo Riichiro

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Journal Paper

Paper Information

Journal: POLYOLEFINS JOURNALS Year:2022 | Volume:9 | Issue:2 Page(s): 117-127

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Title

Characterization of phthalate internal donor in MgCl2 supported Ziegler-Natta catalyst by solid state 13C NMR

Author(s)

Keywords

Ziegler-Natta catalyst

propene polymerization

solid-state 13C NMR

spin-lattice relaxation time

carbonyl(C=O) motion in phthalate molecule

Abstract

Ziegler-Natta catalyst for propylene polymerization, which TiCl4 and di-alkyl phthalate were supported on MgCl2, was analyzed by solid state 13C NMR. It was confirmed that the spin-lattice relaxation time (“, relaxation time”,hereafter) of carbonyl group in phthalate was shortened with increasing measurement temperature as a general manner because of the enhancing of molecular mobility at high temperature. The degree of the relaxation period reduction with temperature was influenced by the alkyl group size in phthalate molecule,the larger alkyl group showed a greater shorting of the relaxation period. A short relaxation time should suggest a weak interaction between the phthalate molecule and the MgCl2 support surface. The change in catalytic performance was discussed by the active site formation mechanism involving the phthalate removal step.

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APA: Copy

Saito, Masayoshi, Uozumi, Toshiya, MURATA, MASAHIDE, Kataoka, Takuo, & Chujo, Riichiro. (2022). Characterization of phthalate internal donor in MgCl2 supported Ziegler-Natta catalyst by solid state 13C NMR. POLYOLEFINS JOURNALS, 9(2), 117-127. SID. https://sid.ir/paper/1033247/en

Vancouver: Copy

Saito Masayoshi, Uozumi Toshiya, MURATA MASAHIDE, Kataoka Takuo, Chujo Riichiro. Characterization of phthalate internal donor in MgCl2 supported Ziegler-Natta catalyst by solid state 13C NMR. POLYOLEFINS JOURNALS[Internet]. 2022;9(2):117-127. Available from: https://sid.ir/paper/1033247/en

IEEE: Copy

Masayoshi Saito, Toshiya Uozumi, MASAHIDE MURATA, Takuo Kataoka, and Riichiro Chujo, “Characterization of phthalate internal donor in MgCl2 supported Ziegler-Natta catalyst by solid state 13C NMR,” POLYOLEFINS JOURNALS, vol. 9, no. 2, pp. 117–127, 2022, [Online]. Available: https://sid.ir/paper/1033247/en

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