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Abstract <p>This study investigated the structural properties and catalytic performance of cobalt-based hybrid bifunctional catalysts incorporating mesoporous ZSM-23 zeolites for Fischer–Tropsch (FT) synthesis. The zeolite was pretreated with 0.1–0.5 M NaOH solutions to introduce mesoporosity, and the resulting catalysts were prepared by mixing the zeolite with a Co–Al/SiO<sub>2</sub> FT catalyst and a boehmite binder. The porous structure, surface acidity, phase composition, and reducibility of the zeolite and catalyst samples were characterized by N<sub>2</sub> adsorption–desorption, IR spectroscopy, X-ray diffraction (XRD), and hydrogen temperature-programmed reduction (H<sub>2</sub>-TPR). Alkaline treatment increased mesopore volume and Lewis acid site concentration while decreasing microporosity and Brønsted acid site concentration. Catalytic performance was evaluated in a fixed-bed reactor at 250°C, 2.0 MPa, and a gas hourly space velocity (GHSV) of 1000 h<sup>–1</sup>. The catalyst containing ZSM-23 treated with 0.25 M NaOH achieved the highest yield of C<sub>5</sub>–C<sub>18</sub> <i>iso</i>-alkanes (47.6 wt %). These findings demonstrate that the selectivity of hybrid FT catalysts toward valuable engine-fuel components can be selectively enhanced by tuning ZSM-23 porosity.</p>

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Hybrid Catalysts Containing Micro/Mesoporous ZSM-23 Zeolites for Fischer–Tropsch Synthesis

  • 期刊论文

  • 发表日期：

    2026年7月6日

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  • Sergey I. Sulima,
  • Anastasia A. Chemes,
  • Maria A. Zubkova,
  • Alexander P. Savost’yanov,
  • Dmitry V. Serebrennikov,
  • Marat R. Agliullin,
  • Viktoria S. Marchenko,
  • Roman E. Yakovenko

摘要

Abstract

This study investigated the structural properties and catalytic performance of cobalt-based hybrid bifunctional catalysts incorporating mesoporous ZSM-23 zeolites for Fischer–Tropsch (FT) synthesis. The zeolite was pretreated with 0.1–0.5 M NaOH solutions to introduce mesoporosity, and the resulting catalysts were prepared by mixing the zeolite with a Co–Al/SiO2 FT catalyst and a boehmite binder. The porous structure, surface acidity, phase composition, and reducibility of the zeolite and catalyst samples were characterized by N2 adsorption–desorption, IR spectroscopy, X-ray diffraction (XRD), and hydrogen temperature-programmed reduction (H2-TPR). Alkaline treatment increased mesopore volume and Lewis acid site concentration while decreasing microporosity and Brønsted acid site concentration. Catalytic performance was evaluated in a fixed-bed reactor at 250°C, 2.0 MPa, and a gas hourly space velocity (GHSV) of 1000 h–1. The catalyst containing ZSM-23 treated with 0.25 M NaOH achieved the highest yield of C5–C18 iso-alkanes (47.6 wt %). These findings demonstrate that the selectivity of hybrid FT catalysts toward valuable engine-fuel components can be selectively enhanced by tuning ZSM-23 porosity.