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<p>Long chain quaternary ammonium salts such as cetyltrimethyl ammonium bromide, as one of important amphiphilic reagents, were preferred as mesoporous reagents for synthesizing hierarchical or nano-sized ZSM-5 zeolites in literatures of recent years. However, the inconvenient operation caused by foam restricted its practical application. In this work, Nano-sized ZSM-5 zeolites were successfully synthesized with a modified seed-induced method by using a short-chain tetrabutylammonium fluoride (TBAF) as a crystal inhibitor. The effects of TBAF/SiO<sub>2</sub> molar ratios and SiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> ratios on morphologies, textural properties, acidity and catalytic performance in MTP reaction were systematically investigated. The results confirmed that highly crystalline ZSM-5 nanocrystals with abundant mesopores were synthesized because of the amphipathy of TBAF. More interestingly, weak acidity could be tuned efficiently via varying TBAF/SiO<sub>2</sub> ratio at the similar strong acidity, while both the weak and strong acidity were changed by adjusting SiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> ratio. Moreover, the prepared nano-sized ZSM-5 catalyst (Z5-167-10) showed an excellent MTP reaction performance with long catalytic lifetime (120&#xa0;h) and high propylene selectivity (44.9%) benefiting from the unique mesoporous structure and acid properties, which delayed the coke formation.</p>

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Synthesis of nano-sized H-ZSM-5 zeolite aggregates by modified seed-induced method and their catalytic performance in methanol to propylene reaction

  • 期刊论文

  • 发表日期：

    2025年3月14日

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  • Hengbao Chen,
  • Xiaohui Lu,
  • Ye Chen,
  • Bing Li,
  • Jiaqi Gao,
  • Lei Liu,
  • Jiayi Hou,
  • Xudong Li

摘要

Long chain quaternary ammonium salts such as cetyltrimethyl ammonium bromide, as one of important amphiphilic reagents, were preferred as mesoporous reagents for synthesizing hierarchical or nano-sized ZSM-5 zeolites in literatures of recent years. However, the inconvenient operation caused by foam restricted its practical application. In this work, Nano-sized ZSM-5 zeolites were successfully synthesized with a modified seed-induced method by using a short-chain tetrabutylammonium fluoride (TBAF) as a crystal inhibitor. The effects of TBAF/SiO2 molar ratios and SiO2/Al2O3 ratios on morphologies, textural properties, acidity and catalytic performance in MTP reaction were systematically investigated. The results confirmed that highly crystalline ZSM-5 nanocrystals with abundant mesopores were synthesized because of the amphipathy of TBAF. More interestingly, weak acidity could be tuned efficiently via varying TBAF/SiO2 ratio at the similar strong acidity, while both the weak and strong acidity were changed by adjusting SiO2/Al2O3 ratio. Moreover, the prepared nano-sized ZSM-5 catalyst (Z5-167-10) showed an excellent MTP reaction performance with long catalytic lifetime (120 h) and high propylene selectivity (44.9%) benefiting from the unique mesoporous structure and acid properties, which delayed the coke formation.