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Issue 99, 2014
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Aluminophosphate monoliths with high CO2-over-N2 selectivity and CO2 capture capacity

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Abstract

Monoliths of microporous aluminophosphates (AlPO4-17 and AlPO4-53) were structured by binder-free pulsed current processing. Such monoliths could be important for carbon capture from flue gas. The AlPO4-17 and AlPO4-53 monoliths exhibited a tensile strength of 1.0 MPa and a CO2 adsorption capacity of 2.5 mmol g−1 and 1.6 mmol g−1, respectively at 101 kPa and 0 °C. Analyses of single component CO2 and N2 adsorption data indicated that the AlPO4-53 monoliths had an extraordinarily high CO2-over-N2 selectivity from a binary gas mixture of 15 mol% CO2 and 85 mol% N2. The estimated CO2 capture capacity of AlPO4-17 and AlPO4-53 monoliths in a typical pressure swing adsorption (PSA) process at 20 °C was higher than that of the commonly used zeolite 13X granules. Under cyclic sorption conditions, AlPO4-17 and AlPO4-53 monoliths were regenerated by lowering the pressure of CO2. Regeneration was done without application of heat, which would regenerate them to their full capacity for CO2 adsorption.

Graphical abstract: Aluminophosphate monoliths with high CO2-over-N2 selectivity and CO2 capture capacity

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Publication details

The article was received on 27 May 2014, accepted on 20 Oct 2014 and first published on 20 Oct 2014


Article type: Paper
DOI: 10.1039/C4RA05009F
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Citation: RSC Adv., 2014,4, 55877-55883
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    Aluminophosphate monoliths with high CO2-over-N2 selectivity and CO2 capture capacity

    F. Akhtar, N. Keshavarzi, D. Shakarova, O. Cheung, N. Hedin and L. Bergström, RSC Adv., 2014, 4, 55877
    DOI: 10.1039/C4RA05009F

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