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<p>Hierarchical SAPO-34 have attracted much attention due to their excellent catalytic stability and target product selectivity in catalytic process. Here, a series of hierarchical SAPO-34 were successfully synthesized by adjusting the natural amino acids content in the synthesis system to control the crystallization process, particle size, and the generation of mesopores/macropores. Multiple physical and chemical characterizations were performed to help us understand the crystallization process of hierarchical SAPO-34. The minor addition of L-lysine (0.1&#xa0;g) mainly affected the crystallization kinetics, resulting in a reduction of the average particle size of SAPO-34 from 132 to 74&#xa0;nm and generating a large number of mesopores. As the L-lysine content increased, the particle size of the SAPO-34 samples gradually increased, and in situ etching effect became dominant, leading to the formation of macropores. The as-synthesized hierarchical SAPO-34 exhibited higher selectivity of ethylene plus propylene and longer catalytic lifetime in 1-butene cracking.</p>

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Natural amino acid-assisted in situ strategy tuning formation of hierarchical SAPO-34

  • 期刊论文

  • 发表日期：

    2025年10月30日

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  • Hongdan Zhang,
  • Danyang Du,
  • Jinyang Chu,
  • Xinyu Lan,
  • Guanzuo Liu,
  • Peng Cheng,
  • Zhen Zhao

摘要

Hierarchical SAPO-34 have attracted much attention due to their excellent catalytic stability and target product selectivity in catalytic process. Here, a series of hierarchical SAPO-34 were successfully synthesized by adjusting the natural amino acids content in the synthesis system to control the crystallization process, particle size, and the generation of mesopores/macropores. Multiple physical and chemical characterizations were performed to help us understand the crystallization process of hierarchical SAPO-34. The minor addition of L-lysine (0.1 g) mainly affected the crystallization kinetics, resulting in a reduction of the average particle size of SAPO-34 from 132 to 74 nm and generating a large number of mesopores. As the L-lysine content increased, the particle size of the SAPO-34 samples gradually increased, and in situ etching effect became dominant, leading to the formation of macropores. The as-synthesized hierarchical SAPO-34 exhibited higher selectivity of ethylene plus propylene and longer catalytic lifetime in 1-butene cracking.