Size-dependent CO2 capture in chemically synthesized magnesium oxide nanocrystals

Abstract

The carbon dioxide storage capacity of magnesium oxide (MgO) particles was examined as a function of particle size, shape, and surface area. Two types of MgO nanocrystals (5 nm spheres and 23 nm disks) were synthesized and compared against commercially available MgO (325 mesh/44 μm and 40 mesh/420 μm). The surface area of the four types of particles was determined by N₂ gas adsorption. Carbon dioxide capture was measured at 60 °C and 600 °C using thermogravimetric analysis, with results indicating enhanced CO₂ capacity correlating with increased surface area.