TY - JOUR
T1 - Synthesis and Characterization of Fe-Substituted ZSM-5 Zeolite and Its Catalytic Performance for Alkylation of Benzene with Dilute Ethylene
AU - Bian, Kai
AU - Zhang, Anfeng
AU - Yang, Hong
AU - Fan, Benhan
AU - Xu, Shutao
AU - Guo, Xinwen
AU - Song, Chunshan
N1 - Funding Information:
This work was supported by the Fundamental Research Funds for the Central Universities (Grant No. DUT18LK47).
Publisher Copyright:
© 2020 American Chemical Society.
PY - 2020/12/30
Y1 - 2020/12/30
N2 - 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.
AB - 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.
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U2 - 10.1021/acs.iecr.0c01909
DO - 10.1021/acs.iecr.0c01909
M3 - Article
AN - SCOPUS:85098779269
SN - 0888-5885
VL - 59
SP - 22413
EP - 22421
JO - Industrial and Engineering Chemistry Research
JF - Industrial and Engineering Chemistry Research
IS - 52
ER -