Synthesis and Characterization of Fe-Substituted ZSM-5 Zeolite and Its Catalytic Performance for Alkylation of Benzene with Dilute Ethylene

Kai Bian, Anfeng Zhang, Hong Yang, Benhan Fan, Shutao Xu, Xinwen Guo, Chunshan Song

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

A series of Fe-substituted ZSM-5 zeolite samples with an almost constant Si/(Fe + Al) molar ratio of 50 but varied levels of Fe substitution were synthesized via an in situ seed-induced hydrothermal method in a fluoride medium. Additionally, a hierarchical Fe-substituted sample with high diffusion capability was also produced by a subsequent alkaline treatment. The textural and acidic properties of these samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-Raman, Fourier transform infrared (FT-IR), UV-vis, H2-temperature programmed reduction (TPR), Ar adsorption-desorption, NH3-temperature-programmed desorption (TPD), X-ray fluorescence (XRF), 27Al, and 29Si magic-angle spinning (MAS) NMR analysis. These analyses revealed that Fe3+ species were effectively integrated into the MFI framework of the Fe-substituted samples. The as-synthesized samples displayed orthogonally intergrown crystal plates of increased aspect ratios with increased Fe-substitutions. More significantly, the resulted Fe-substituted samples displayed a noticeably reduced acid strength compared to the pure ZSM-5. Evaluated by the benzene alkylation reaction withdilute ethylene, the 50% partially Fe-substituted ZSM-5 sample showed a combined high ethyl selectivity and long catalytic lifetime among all catalysts studied, which is attributed to its suitably balanced acid strength.

Original languageEnglish (US)
Pages (from-to)22413-22421
Number of pages9
JournalIndustrial and Engineering Chemistry Research
Volume59
Issue number52
DOIs
StatePublished - Dec 30 2020

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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