Department of Chemistry and Centre for Materials Discovery and ⊥Department of Chemistry and Stephenson Institute for Renewable Energy, University of Liverpool , Crown Street, Liverpool, L69 7ZD, United Kingdom.
J Am Chem Soc. 2014 Jun 25;136(25):9028-35. doi: 10.1021/ja5031968. Epub 2014 Jun 11.
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. In particular, materials must be tolerant to the water vapor and to the acidic impurities that are present in gas streams produced by using fossil fuels to generate electricity. We show that a porous organic polymer has 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 hardly affected by the adsorption of water vapor. The polymer is even stable to boiling in concentrated acid for extended periods, a property that is matched by few microporous adsorbents. The polymer adsorbs CO2 in a different way 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, even though its constituent monomers are very simple organic feedstocks, as would be required for materials preparation on the large industrial scales required for carbon capture.
为了减少碳排放，用于碳捕获的新材料必须价格低廉、坚固耐用，并且能够从其他气体的混合物中特异性地吸附 CO2。特别是，材料必须耐受水蒸气和酸性杂质，这些杂质存在于使用化石燃料发电产生的气流中。我们表明，一种多孔有机聚合物在与预燃烧 CO2 捕获相关的条件下具有出色的 CO2 容量和高 CO2 选择性。与极性吸附剂（如沸石 13x 和金属-有机骨架 HKUST-1）不同，疏水聚合物的 CO2 吸附容量几乎不受水蒸气吸附的影响。该聚合物即使在浓酸中煮沸很长时间也很稳定，这种性质很少有微孔吸附剂能够匹配。与其他耐水、不可膨胀的骨架（如活性炭和 ZIF-8）相比，聚合物通过物理膨胀吸附 CO2，就像海绵吸附水一样。这导致更高的 CO2 容量和更好的 CO2 选择性。即使其组成单体是非常简单的有机原料，作为用于大规模工业碳捕获所需的材料制备，这种聚合物作为选择性气体吸附剂也具有优越的功能。
