Swellable,
Water- and Acid-Tolerant Polymer Sponges for Chemoselective Carbon Dioxide Capture
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Type
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Journal
Article
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Author
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Robert
T. Woodward
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Author
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Lee
A. Stevens
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URL
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Volume
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136
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Issue
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25
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Pages
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9028-9035
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Publication
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Journal
of the American Chemical Society
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Date
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2014
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Abstract
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To
impact carbon emissions, new materials for carbon capture must be
inexpensive, robust, and able to adsorb CO2 specifically from a mixture of
other gases. Materials must be tolerant to water vapor and to the acidic
impurities that are present in gas streams produced by using fossil fuels to
generate electricity. Authors describe a porous organic polymer possessing
excellent CO2 capacity and high CO2 selectivity under conditions relevant to
precombustion CO2 capture.
Unlike polar adsorbents, such as zeolite 13x and the metal organic framework, HKUST-1, the CO2 adsorption capacity for the hydrophobic polymer is barely affected by the adsorption of water vapor. The polymer is stable even to boiling in concentrated acid for extended periods, a property matched by few microporous adsorbents. The polymer adsorbs CO2 in a way which differs from rigid materials by physical swelling, much as a sponge adsorbs water. This gives rise to a higher CO2 capacities and much better CO2 selectivity than for other water-tolerant, nonswellable frameworks, such as activated carbon and ZIF-8. The polymer has superior function as a selective gas adsorbent, although its constituent monomers are very simple organic feedstocks, as would be required for materials preparation on the large industrial scales required for carbon capture. |
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