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<p>Zeolite synthesis using common composite building units (CBUs) can eliminate barriers for zeolite seeds that needs to be synthesized with OSDA, heavy or precious metal ions and extremely long synthesis time. We present the fast synthesis of CHA zeolites with exotic KFI seeds for the first time. The crystallization behavior of CHA zeolites was studied concerning gel composition, temperature and duration. Adjusting water content and alkalinity in the starting gel is essential for synthesizing pure-phase CHA zeolites with high crystallinity. Pure-phase CHA zeolites can be quickly synthesized at 150 °C for 8 to 12 h with various gel compositions. Success relies on the targeted CHA zeolite products sharing composite building unit of double six ring (D6R) structure with KFI zeolite seeds. N<sub>2</sub>, CO<sub>2</sub> and CH<sub>4</sub> adsorption properties on the as-synthesized CHA zeolites were studied at 77 K and room temperature. A high CO<sub>2</sub> adsorption capacity of ca. 90 cm<sup>3</sup>/g and CO<sub>2</sub>/CH<sub>4</sub> ideal selectivity of 7.3 could be achieved at P/P<sub>0</sub> of 0.5. The results suggest that the as-synthesized CHA zeolite crystals may be suitable for pressure swing adsorption.</p>

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Synthesis of low-silica CHA zeolites with KFI seeds in a K+ system

  • 期刊论文

  • 发表日期：

    2025年7月12日

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  • Jie Zhu,
  • Yi Qian,
  • Zhenhao Lu,
  • Qingqing Jiang,
  • Xiaowen Xu,
  • Guoliang Dai,
  • Ruifeng Song,
  • Ji Jiang

摘要

Zeolite synthesis using common composite building units (CBUs) can eliminate barriers for zeolite seeds that needs to be synthesized with OSDA, heavy or precious metal ions and extremely long synthesis time. We present the fast synthesis of CHA zeolites with exotic KFI seeds for the first time. The crystallization behavior of CHA zeolites was studied concerning gel composition, temperature and duration. Adjusting water content and alkalinity in the starting gel is essential for synthesizing pure-phase CHA zeolites with high crystallinity. Pure-phase CHA zeolites can be quickly synthesized at 150 °C for 8 to 12 h with various gel compositions. Success relies on the targeted CHA zeolite products sharing composite building unit of double six ring (D6R) structure with KFI zeolite seeds. N2, CO2 and CH4 adsorption properties on the as-synthesized CHA zeolites were studied at 77 K and room temperature. A high CO2 adsorption capacity of ca. 90 cm3/g and CO2/CH4 ideal selectivity of 7.3 could be achieved at P/P0 of 0.5. The results suggest that the as-synthesized CHA zeolite crystals may be suitable for pressure swing adsorption.