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

Aluminophosphate monoliths with high CO 2-over-N 2 selectivity and CO 2 capture capacity. Access to the published version may require subscription. a Monoliths of microporous aluminophosphates (AlPO 4-17 and AlPO 4-53) were structured by binder-free pulsed current processing. Such monoliths could be important for carbon capture from flue gas. The AlPO 4-17 and AlPO 4-53 monoliths exhibited a tensile strength of 1.0 MPa and a CO 2 adsorption capacity of 2.5 mmol g À1 and 1.6 mmol g À1 , respectively at 101 kPa and 0 C. Analyses of single component CO 2 and N 2 adsorption data indicated that the AlPO 4-53 monoliths had an extraordinarily high CO 2-over-N 2 selectivity from a binary gas mixture of 15 mol% CO 2 and 85 mol% N 2. The estimated CO 2 capture capacity of AlPO 4-17 and AlPO 4-53 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, AlPO 4-17 and AlPO 4-53 monoliths were regenerated by lowering the pressure of CO 2. Regeneration was done without application of heat, which would regenerate them to their full capacity for CO 2 adsorption.