Investigation on fluorinated alumina catalysts prepared by the fluorination of γ-Al2O3 with CHF3 for the isomerization of E-1-chloro-3,3,3-trifluoropropene

Shiwei Feng, Chengping Zhang*, Hengdao Quan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

As an environmentally friendly cleaning agent, Z-1-chloro-3,3,3-trifluoropropene (HCFO-1233zd(Z)) can realize industrial production by the isomerization of HCFO-1233zd(E). Herein, various isomerization catalysts with different structures, compositions and acid properties were prepared through the fluorination of γ-Al2O3 with CHF3 by controlling the activation conditions. For the first time, the catalysts for HCFO-1233zd(E) isomerization were systematically studied by XRD, N2 physisorption, XPS, SEM, MAS NMR spectroscopy, NH3-TPD and py-IR. The active site of this reaction was revealed and the catalyst deactivation mechanism was proposed. It turned out that HCFO-1233zd(E) isomerization prefers to occur at Lewis acid sites with moderate density and strength. The amorphous particles composed of γ-Al2O3, Al2O3(F) and α-AlF3 (R3¯c) at 450 °C exhibit highly catalytic activity for HCFO-1233zd(E) isomerization. After 100 h evaluation, it was found that residual γ-Al2O3 can be fluorinated by HCFO-1233zd(E) to form needle-like structures which could induce the amorphous Al2O3(F) particles to reorganize and give cubic structures, where the Lewis acid properties were enhanced, leading to catalyst deactivation.

Original languageEnglish
Article number112917
JournalMolecular Catalysis
Volume536
DOIs
Publication statusPublished - 1 Feb 2023

Keywords

  • Acid strength
  • E-1-chloro-3,3,3-fluoropropene
  • Fluorinated alumina
  • Lewis acid sites
  • Z-1-chloro-3,3,3-fluoropropene

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