Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 1, Pages 769-775Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b16574
Keywords
molecular layer deposition; pore misalignment; CO2 capture; CO2/N-2 adsorption selectivity; CO2 adsorption rate
Funding
- National Science Foundation (NSF), United States [CBET-1402772]
- Div Of Chem, Bioeng, Env, & Transp Sys [1402772] Funding Source: National Science Foundation
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Effective pore mouth size of 5A zeolite was engineered by depositing an ultrathin layer of microporous TiO2 on its external surface and appropriate pore misalignment at the interface. As a result, a slightly bigger N-2 molecule (kinetic diameter: 0.364 nm) was effectively excluded, whereas CO2 (kinetic diameter: 0.33 nm) adsorption was only influenced slightly. The prepared composite zeolite sorbents showed an ideal CO2/N-2 adsorption selectivity as high as similar to 70, a 4-fold increase over uncoated zeolite sorbents, while maintaining a high CO2 adsorption capacity (1.62 mmol/g at 0.5 bar and 25 degrees C) and a fast CO2 adsorption rate.
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