Pore Volume Synthesis for Selective Carbon Dioxide-Nitrogen Adsorption Using Metal-Organic Framework-Silica Composite: UTSA-280 & HS-PEG
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Cowie-Williams, Jair M
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Abstract
Driven by industrialization, the rise in fossil fuel consumption has led to CO2 levels surpassing 417 ppm in 2022. Resultantly, severe environmental issues like global warming, ocean acidification, extreme weather, and species extinction have developed. As a response, Carbon Capture and Storage (CCS) technologies have become critical for mitigating CO2 emissions. Among various CO2 capture techniques, solid adsorbents like zeolites, activated carbon, porous organic polymers, covalent organic frameworks (COFs), and metal-organic frameworks (MOFs) are highly promising due to their adjustable structures and high surface areas.
This study focuses on enhancing CO2 adsorption in hierarchical silica (HS-PEG) by incorporating the MOF UTSA-280. While HS-PEG alone exhibited low CO2 adsorption, the addition of UTSA-280 significantly improved both CO2 uptake and selectivity. CO2 isotherm measurements revealed substantial improvements in CO2 adsorption capacities with increasing UTSA-280 content, whereas nitrogen uptake remained low, underscoring the composite's potential for CO2 separation in flue gas streams.
Further analysis of the isosteric heat of adsorption showed that UTSA-280 contributed to a more uniform adsorption surface for CO2. Composites with higher UTSA-280 loading had similar adsorption properties to pure UTSA-280, aligning with the observed increase in CO2 uptake. Selectivity analysis using various methods consistently demonstrated that composites with higher UTSA-280 content had improved CO2/N2 selectivity, confirming that the presence of UTSA-280 enhances both CO2 capture and selectivity in HS-PEG composites.
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