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<p>Diffusion limitations in microporous ZSM-5 zeolites hinder the efficient aromatization of light naphtha into valuable BTX (benzene, toluene, xylenes). In this work, we report the development of a mesostructured bimetallic catalyst through controlled alkaline desilication of ZSM-5 (Z5), followed by the incorporation of 2 wt% La and 1 wt% Zn via wet impregnation. The desilicated zeolite (Z5-AT) exhibited enhanced mesoporosity, improving molecular diffusion and boosting BTX yield from 24 wt% (Z5) to 49 wt%. Further metal modification significantly enhanced performance, with the optimized 2%La-1%Zn/Z5-AT catalyst achieving a BTX yield of 72.7 wt% at 550&#xa0;°C in a fixed-bed down-flow reactor. Zn incorporation enhances the Lewis-to-Brønsted acid site (L/B) ratio, which accelerates dehydrogenation activity and promotes higher BTX formation. Textural and acidity characterizations confirmed uniform metal dispersion, improved surface area, and a favorable increase in L/B ratio. In-situ pyridine-FTIR and NH<sub>3</sub>-TPD analyses revealed synergistic effects between La and Zn, promoting dehydrogenation, acidity tuning, and coke suppression. These results demonstrate the effectiveness of mesostructured bimetallic ZSM-5 in enhancing light naphtha aromatization, with high aromatic selectivity and improved stability.</p> Graphical Abstract <p></p>

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Mesostructured bimetallic MFI zeolite for efficient aromatization of light naphtha to BTX aromatics

  • 期刊论文

  • 发表日期：

    2025年12月5日

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  • Muhammad Waqas,
  • Tatinaidu Kella,
  • Ziyauddin S. Qureshi,
  • Yaming Jin,
  • Abdullah Aitani,
  • Hassan Alasiri

摘要

Diffusion limitations in microporous ZSM-5 zeolites hinder the efficient aromatization of light naphtha into valuable BTX (benzene, toluene, xylenes). In this work, we report the development of a mesostructured bimetallic catalyst through controlled alkaline desilication of ZSM-5 (Z5), followed by the incorporation of 2 wt% La and 1 wt% Zn via wet impregnation. The desilicated zeolite (Z5-AT) exhibited enhanced mesoporosity, improving molecular diffusion and boosting BTX yield from 24 wt% (Z5) to 49 wt%. Further metal modification significantly enhanced performance, with the optimized 2%La-1%Zn/Z5-AT catalyst achieving a BTX yield of 72.7 wt% at 550 °C in a fixed-bed down-flow reactor. Zn incorporation enhances the Lewis-to-Brønsted acid site (L/B) ratio, which accelerates dehydrogenation activity and promotes higher BTX formation. Textural and acidity characterizations confirmed uniform metal dispersion, improved surface area, and a favorable increase in L/B ratio. In-situ pyridine-FTIR and NH3-TPD analyses revealed synergistic effects between La and Zn, promoting dehydrogenation, acidity tuning, and coke suppression. These results demonstrate the effectiveness of mesostructured bimetallic ZSM-5 in enhancing light naphtha aromatization, with high aromatic selectivity and improved stability.

Graphical Abstract