SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2023, Vol. 56 ›› Issue (4): 273-280.DOI: 10.1016/j.cjche.2022.07.012

• Full Length Article • 上一篇    下一篇

Improved SSZ-13 thin membranes fabricated by seeded-gel approach for efficient CO2 capture

Xingzhong Li, Kunlin Yu, Zibo He, Bo Liu, Rongfei Zhou, Weihong Xing   

  1. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 210009, China
  • 收稿日期:2022-04-10 修回日期:2022-07-12 出版日期:2023-04-28 发布日期:2023-06-13
  • 通讯作者: Bo Liu,E-mail:liu@njtech.edu.cn;Rongfei Zhou,E-mail:rf-zhou@njtech.edu.cn
  • 基金资助:
    Financial supports from the National Natural Science Foundation of China (21921006, 21938007 and 21576131) and the open project of the State Key Laboratory of Materials-Oriented Chemical Engineering of China (KL21-04) are gratefully acknowledged.

Improved SSZ-13 thin membranes fabricated by seeded-gel approach for efficient CO2 capture

Xingzhong Li, Kunlin Yu, Zibo He, Bo Liu, Rongfei Zhou, Weihong Xing   

  1. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 210009, China
  • Received:2022-04-10 Revised:2022-07-12 Online:2023-04-28 Published:2023-06-13
  • Contact: Bo Liu,E-mail:liu@njtech.edu.cn;Rongfei Zhou,E-mail:rf-zhou@njtech.edu.cn
  • Supported by:
    Financial supports from the National Natural Science Foundation of China (21921006, 21938007 and 21576131) and the open project of the State Key Laboratory of Materials-Oriented Chemical Engineering of China (KL21-04) are gratefully acknowledged.

摘要: High-quality standard oil synthetic zeolite-13 (SSZ-13) membranes with thickness only ~ 1.0 μm were prepared on tubular supports by the new seeded-gel approach. Seeded-gel approach is simpler than the normal secondary-growth one since adding seeds in the gel is simpler than seeding on the support surface. The synthesis time was greatly reduced from 3.0 to 1.0 d after synthesis modification of gel aging and seed sizes. Low temperature ozone calcination was used for the removal of the organic structural directing agent. The best SSZ-13 membrane displayed CO2 permeances of 1.3×10–6 and 1.5×10–6 mol·m-2·s-1·Pa-1 and CO2/CH4 and CO2/N2 selectivities of 125 and 27 for equimolar CO2/CH4 and CO2/N2 mixtures at 0.2 MPa pressure drop and 298 K, respectively. Separation performance of the membrane in the two binary mixtures is higher than that of most zeolite membranes. Three SSZ-13 membranes were reproducibly prepared on tubular supports by seeded-gel approach and the standard deviation ratios of CO2 permeance and CO2/CH4 selectivity are 12.5% and 7%, respectively. It suggests that this new synthesis approach is creditable. The effects of temperature and pressure on separation performance of the thin SSZ-13 membranes were studied in the two binary mixtures. The tubular SSZ-13 membranes displayed great potentials for CO2 capture from natural gas, biogas and flue gas.

关键词: Zeolite CHA, Zeolite membranes, SSZ-13, Gas separation, CO2 capture, Seeded-gel approach

Abstract: High-quality standard oil synthetic zeolite-13 (SSZ-13) membranes with thickness only ~ 1.0 μm were prepared on tubular supports by the new seeded-gel approach. Seeded-gel approach is simpler than the normal secondary-growth one since adding seeds in the gel is simpler than seeding on the support surface. The synthesis time was greatly reduced from 3.0 to 1.0 d after synthesis modification of gel aging and seed sizes. Low temperature ozone calcination was used for the removal of the organic structural directing agent. The best SSZ-13 membrane displayed CO2 permeances of 1.3×10–6 and 1.5×10–6 mol·m-2·s-1·Pa-1 and CO2/CH4 and CO2/N2 selectivities of 125 and 27 for equimolar CO2/CH4 and CO2/N2 mixtures at 0.2 MPa pressure drop and 298 K, respectively. Separation performance of the membrane in the two binary mixtures is higher than that of most zeolite membranes. Three SSZ-13 membranes were reproducibly prepared on tubular supports by seeded-gel approach and the standard deviation ratios of CO2 permeance and CO2/CH4 selectivity are 12.5% and 7%, respectively. It suggests that this new synthesis approach is creditable. The effects of temperature and pressure on separation performance of the thin SSZ-13 membranes were studied in the two binary mixtures. The tubular SSZ-13 membranes displayed great potentials for CO2 capture from natural gas, biogas and flue gas.

Key words: Zeolite CHA, Zeolite membranes, SSZ-13, Gas separation, CO2 capture, Seeded-gel approach