DYNAMIC ESR CHARACTERIZATION OF CATALYSTS ZrCl4/AlEt2Cl and ZrCl4/AlEt2Cl-n-C4 H9ONa

Chinese Journal of Applied Chemistry ›› 1989, Vol. 0 ›› Issue (6): 89-91.

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DYNAMIC ESR CHARACTERIZATION OF CATALYSTS ZrCl₄/AlEt₂Cl and ZrCl₄/AlEt₂Cl-n-C₄ H₉ONa

Lin Qingsong, Wang Yu, He Ren

Department of Chemistry, Dalian University of Technology

Received:1989-01-26 Revised:1989-07-15 Published:1989-12-10 Online:1989-12-10

Abstract

Abstract: ESR spectra of zirconium in ZrCl₄/AlEt₂Cl and ZrCl₄/AlEt₂Cl-n-C₄H₉ONa catalystsystems were recorded at various reaction times, the g=1.978, △Hpp=22.4×10^-4T. The spin concentration s were determined for two systems. It is shown that Zr⁴⁺is first reduced to Zr³⁺, which is further reduced to lower state. The reduction rate of Zr⁴⁺and Zr³⁺ in ZrCl₄/AlEt₂Cl-n-C₄H₉ONa system is lower than that in ZrCl₄/AlEt₂Cl system.This fact indicates that n-C₄H₉ONa plays an importent rolc in restraining reduction of Zr⁴⁺ and Zr³⁺.

Key words: ESR, Zirconium, Oligomerization of ethylene Catalysis

Lin Qingsong, Wang Yu, He Ren. DYNAMIC ESR CHARACTERIZATION OF CATALYSTS ZrCl₄/AlEt₂Cl and ZrCl₄/AlEt₂Cl-n-C₄ H₉ONa[J]. Chinese Journal of Applied Chemistry, 1989, 0(6): 89-91.

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DYNAMIC ESR CHARACTERIZATION OF CATALYSTS ZrCl₄/AlEt₂Cl and ZrCl₄/AlEt₂Cl-n-C₄ H₉ONa

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