3D Printed Limestone\nMonoliths for CO<sub>2</sub> Capture\nin Calcium Looping

In this experiment, limestone monoliths were 3D printed\nusing a\nnovel limestone mixture, then tested inside of a fixed bed reactor.\nThis represents to the author’s knowledge the first use of\n3D printed monoliths in calcium looping. Four monoliths with different\ninfill geometries were tested and compared against a random packing\nand limestone powder. Comparison was made through the adsorptive capacity\nof CO<sub>2</sub>, and the pressure drop across the column. Calcination\nwas done at 850 °C, under pure N<sub>2</sub>, whereas carbonation\nwas conducted at 650 °C with 15% CO<sub>2</sub>, balance N<sub>2</sub>. The adsorptive performance of these monoliths was in line\nwith the traditional limestone powder on a millimole CO<sub>2</sub>/g<sub>sorbent</sub> basis, but the pressure drop across the column\nwas reduced by ∼58% on average.