Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 28, Pages 32182-32188Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c08040
Keywords
membranes; porous organic cages; gas separations; xenon; light gases
Funding
- National Science Foundation (CBET award) [1835924]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1835924] Funding Source: National Science Foundation
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Herein, we demonstrate the successful synthesis and separation ability of CC3 porous organic cage membranes grown on tubular supports for light gases He, CO2, CH4, and Kr over xenon. CC3 membranes were synthesized using secondary seeded growth and displayed different separation performances depending on the crystal size, size distribution of the seeds, and membrane thickness. CC3 membranes as thin as similar to 2.5 mu m resulted in high single gas permeances of 2114, 1962, 1705, 773, and 162 GPU, for He, CH4, CO2, Kr, and Xe, respectively. The highest ideal selectivities for He/Xe, CH4/Xe, CO2/Xe, and Kr/Xe gas pairs were 13, 12, 10.5, and 4.8, respectively. Mechanistically, the membranes separated He, CO2, Kr, and CH4 from Xe mainly via gas diffusivity differences. Therefore, the separation was kinetically driven.
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