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

Document Type : Original research

Authors

1 Research and Development Division, Toho Titanium Co., LTD., 3-3-5, Chigasaki Chigasaki-City, Kanagawa, 253-8510, Japan

2 Professor Emeritus at Tokyo Institute of Technology, 2-12-1, Ookayama Meguro-ku, Tokyo, 152-8550, Japan

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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Main Subjects

References

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History

  • Receive Date: 24 December 2021
  • Revise Date: 22 February 2022
  • Accept Date: 12 March 2022
  • First Publish Date: 18 March 2022

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