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The synergistic effect of aluminum distribution and acid properties in HZSM-5 for improving the catalytic performance of bioethanol-to-propylene conversion

Author

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  • Ru, Yi
  • Xue, Zhaoteng
  • Meng, Tao
  • Zhang, Mingxuan
  • Yu, Jun
  • Mao, Dongsen

Abstract

Boron isomorphous substitution was employed to precisely regulate both the distribution of framework aluminum (AlF) and the acid properties of ZSM-5 zeolite during its one-step hydrothermal synthesis. Comprehensive characterization by XRD, SEM, N2 adsorption/desorption, ICP-OES, XPS, NH3-TPD, Py-IR, TG, 27Al MAS NMR, and UV-vis-DRS revealed that boron preferentially occupies the channel intersections, redistributing AlF toward straight and sinusoidal channels and reducing intersection acid density. Boron incorporation also increased medium-strength Brønsted acid sites while suppressing strong acid sites. These modifications optimized the olefin and cyclopentadiene cycles in the bioethanol-to-propylene (ETP) reaction, resulting in a propylene selectivity of 28.6% and a catalytic lifetime exceeding 23 h for the optimal catalyst (2-BHZ5), significantly outperforming unmodified HZSM-5 (HZ5). This work offers an effective strategy for tuning zeolite acidity and Al positioning to enhance bioethanol valorization and promote sustainable propylene production.

Suggested Citation

  • Ru, Yi & Xue, Zhaoteng & Meng, Tao & Zhang, Mingxuan & Yu, Jun & Mao, Dongsen, 2026. "The synergistic effect of aluminum distribution and acid properties in HZSM-5 for improving the catalytic performance of bioethanol-to-propylene conversion," Renewable Energy, Elsevier, vol. 271(C).
    • Handle: RePEc:eee:renene:v:271:y:2026:i:c:s0960148126008402
    DOI: 10.1016/j.renene.2026.126014
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