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Abstract <p>This paper describes the preparation of two bifunctional Pt catalysts: one supported on a ZSM-23 zeolite (MTT topology) synthesized <i>via</i> a seed-assisted method, and the other on a commercial ZSM-23. Physicochemical characterization (XRD, XRF, SEM, TEM, N<sub>2</sub> physisorption, NH<sub>3</sub>-TPD) revealed that the synthesized ZSM-23 possessed a hierarchical structure and a balanced distribution of weak and strong acid sites. In <i>n</i>-hexadecane hydroisomerization, the catalyst based on the synthesized ZSM-23 exhibited superior stability (500 h). In the hydroisodewaxing of a hydrotreated diesel fraction, both catalysts provided similar levels of product quality, achieving a dramatic improvement in cold filter plugging point (CFPP of –46 and –47°C vs. –5°C in the feedstock) and high diesel fuel yields (93.4 and 93.1 wt %). The resulting diesel fuel met all specifications (including CFPP, closed-cup flash point, fractional composition, and density) for GOST R 55475-2013 A-44 grade.</p>

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Isodewaxing of Diesel Fuels Using Bifunctional Catalysts Supported on MTT Zeolites

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • Y. Aljajan,
  • L. D. Zatsepina,
  • M. I. Rubtsova,
  • E. M. Smirnova,
  • V. D. Stytsenko,
  • N. A. Vinogradov,
  • A. A. Pimerzin,
  • A. P. Glotov

摘要

Abstract

This paper describes the preparation of two bifunctional Pt catalysts: one supported on a ZSM-23 zeolite (MTT topology) synthesized via a seed-assisted method, and the other on a commercial ZSM-23. Physicochemical characterization (XRD, XRF, SEM, TEM, N2 physisorption, NH3-TPD) revealed that the synthesized ZSM-23 possessed a hierarchical structure and a balanced distribution of weak and strong acid sites. In n-hexadecane hydroisomerization, the catalyst based on the synthesized ZSM-23 exhibited superior stability (500 h). In the hydroisodewaxing of a hydrotreated diesel fraction, both catalysts provided similar levels of product quality, achieving a dramatic improvement in cold filter plugging point (CFPP of –46 and –47°C vs. –5°C in the feedstock) and high diesel fuel yields (93.4 and 93.1 wt %). The resulting diesel fuel met all specifications (including CFPP, closed-cup flash point, fractional composition, and density) for GOST R 55475-2013 A-44 grade.