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<p>The SAPO-34 molecular sieves were synthesized via a hydrothermal method using tetraethylammonium hydroxide and triethylamine as dual templates, with myristyl sulfobetaine (SB3-14) as a crystal growth inhibitor. The synthesized samples were systematically characterized by XRD, SEM, ICP, N<sub>2</sub> adsorption–desorption, NH<sub>3</sub>-TPD, pyridine-adsorption IR, and FT-IR techniques to analyze their composition, acidity, and structural properties. Results demonstrated that increasing the molar ratio of SB3-14 to Al<sub>2</sub>O<sub>3</sub> from 0.01 to 0.04 caused significant variations in morphology, chemical composition, and acidic characteristics of the samples. When the molar ratio of SB3-14 to Al<sub>2</sub>O<sub>3</sub> was 0.02, the synthesized sample NS-0.02 exhibited the smallest crystal size, the largest specific surface area, and moderately reduced acidity. The catalytic performance was evaluated in the MTO reaction. The NS-0.02 sample exhibited superior catalytic performance with 94.5% selectivity to light olefins and a catalytic lifetime of 600&#xa0;min.</p>

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Myristyl sulfobetaine-assisted synthesis of SAPO-34 molecular sieves with improved methanol-to-olefins (MTO) performance

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • Yuwei Li,
  • Haijun Zhang,
  • Xiangge Sang,
  • Yulong Zheng,
  • Gang Yang

摘要

The SAPO-34 molecular sieves were synthesized via a hydrothermal method using tetraethylammonium hydroxide and triethylamine as dual templates, with myristyl sulfobetaine (SB3-14) as a crystal growth inhibitor. The synthesized samples were systematically characterized by XRD, SEM, ICP, N2 adsorption–desorption, NH3-TPD, pyridine-adsorption IR, and FT-IR techniques to analyze their composition, acidity, and structural properties. Results demonstrated that increasing the molar ratio of SB3-14 to Al2O3 from 0.01 to 0.04 caused significant variations in morphology, chemical composition, and acidic characteristics of the samples. When the molar ratio of SB3-14 to Al2O3 was 0.02, the synthesized sample NS-0.02 exhibited the smallest crystal size, the largest specific surface area, and moderately reduced acidity. The catalytic performance was evaluated in the MTO reaction. The NS-0.02 sample exhibited superior catalytic performance with 94.5% selectivity to light olefins and a catalytic lifetime of 600 min.