Aluminophosphate monoliths with high CO2-over-N-2 selectivity and CO2 capture capacity

作者：Akhtar F^*; Keshavarzi N; Shakarova D; Cheung O; Hedin N; Bergstrom L

来源：RSC Advances, 2014, 4(99): 55877-55883.

DOI：10.1039/c4ra05009f

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 degrees C. Analyses of single component CO2 and N-2 adsorption data indicated that the AlPO4-53 monoliths had an extraordinarily high CO2-over-N-2 selectivity from a binary gas mixture of 15 mol% CO2 and 85 mol% N-2. The estimated CO2 capture capacity of AlPO4-17 and AlPO4-53 monoliths in a typical pressure swing adsorption (PSA) process at 20 degrees 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.

• 出版日期2014