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<p>ZSM-11 zeolites were systematically synthesized by a simple two-stage crystallization method with TBABr and TBAF template respectively. The physical and chemical properties of the obtained samples were characterized by using XRD, FTIR, SEM, N<sub>2</sub> physical adsorption &amp; desorption and NH<sub>3</sub>-TPD. The effects of Br<sup>−</sup> and F<sup>−</sup> on the morphologies, structure, acidities as well as the catalytic performance of methanol to olefins (MTO) process were elaborately investigated. The findings suggested that the F<sup>−</sup> anion facilitated the aggregation of nanocrystalline grains and a more refined MEL structure, thereby resulting in a larger BET surface, abundant mesopores and moderate acidity, which effectively improved diffusion ability and suppressed coke deposition. In contrast, the Br<sup>−</sup> contributed to the morphology of rod-like crystals aggregation and the co-crystalline ZSM-11/5 zeolites. As a result, the ZSM-11 zeolite prepared with TBAF template exhibited significantly superior catalytic performance in MTO process with a longer lifetime and higher selectivity to propylene and butene, compared to the ZSM-11 synthesized using TBABr template.</p>

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The effect of Br− and F− on the synthesis of ZSM-11 zeolites with tetrabutylammonium salts and the catalytic performance of methanol to olefins

  • 期刊论文

  • 发表日期：

    2025年11月15日

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  • Xiaohui Lu,
  • Jiayi Hou,
  • Ye Chen,
  • Xintao Li,
  • Qianrui Li,
  • Lei Liu,
  • Hengbao Chen

摘要

ZSM-11 zeolites were systematically synthesized by a simple two-stage crystallization method with TBABr and TBAF template respectively. The physical and chemical properties of the obtained samples were characterized by using XRD, FTIR, SEM, N2 physical adsorption & desorption and NH3-TPD. The effects of Br− and F− on the morphologies, structure, acidities as well as the catalytic performance of methanol to olefins (MTO) process were elaborately investigated. The findings suggested that the F− anion facilitated the aggregation of nanocrystalline grains and a more refined MEL structure, thereby resulting in a larger BET surface, abundant mesopores and moderate acidity, which effectively improved diffusion ability and suppressed coke deposition. In contrast, the Br− contributed to the morphology of rod-like crystals aggregation and the co-crystalline ZSM-11/5 zeolites. As a result, the ZSM-11 zeolite prepared with TBAF template exhibited significantly superior catalytic performance in MTO process with a longer lifetime and higher selectivity to propylene and butene, compared to the ZSM-11 synthesized using TBABr template.