Stability of Supported Amine Adsorbents to SO₂ and NOₓ in Postcombustion CO₂ Capture. 2. Multicomponent Adsorption


Packed bed CO₂ adsorption breakthrough experiments using both amine-impregnated and amine-grafted silica adsorbent materials in the presence of SO₂, NO and NO₂ impurities are reported. The effects of temperature, feed concentration and adsorbent amine loading on the dynamic adsorption capacity of the adsorbents are evaluated by performing dual component SO₂/CO₂, NO/CO₂ and NO₂/CO₂ coadsorption experiments as well as three component SO₂/NO/CO₂ adsorption experiments. Although SO₂ is found to significantly influence the dynamic CO₂ capacity of aminosilica adsorbents, the obtained results confirm the long-term stability of the adsorbents during SO₂/CO₂ coadsorption runs when the bed is not allowed to fully saturate with SO₂. On the other hand, little competitive effect of NO on CO₂ adsorption is observed in any case. This is due to the decreased affinity of amine-based adsorbents toward NO as opposed to SO₂. The more reactive nitrogen oxide, NO₂, is shown to have a minimal impact on CO₂ adsorption when it is present at low levels in the simulated flue gas. Among the adsorbents investigated, the results demonstrate that secondary amine containing adsorbents are more stable to SOx and NOx impurities in CO₂ capture processes than those that contain primary amine groups.


Chemical and Biochemical Engineering

Keywords and Phrases

Adsorbents; Adsorption; Experiments; Impurities; Nitrogen Oxides; Packed Beds; Sulfur Dioxide; Adsorption Breakthrough Experiment; Adsorption Experiment; Amine-Based Adsorbents; Competitive Effects; Effects of Temperature; Long Term Stability; Multicomponent Adsorption; Primary Amine Groups; Carbon Dioxide

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Article - Journal

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© 2014 American Chemical Society (ACS), All rights reserved.

Publication Date

01 Jul 2014