Abstract
CO2 fixation as formation of MgCO3 with Mg (OH) 2 is of particular interest because of the abundance of magnesium. We have studied an effect of crystallinity of Mg (OH) 2 powder on their carbonation reactivity using synthesized Mg (OH) 2.
Three types of Mg (OH) 2 specimens were prepared using autoclave at 60°C, 120°C and 180°C, respectively. These were analyzed using X-ray diffraction, scanning electron microscopy, thermal analysis method and BET method. Difference of synthetic temperature has yielded variation of crystalinity of Mg (OH) 2 to affect thermal properties and specific surface areas.
These specimens were suspended in the thermogravimetric analysis apparatus to perform isothermal thermogravimetric analyses at 350°C, 375°Cand 400°Cin CO2 as carbonation experiments, respectively. Each specimen acquired the greatest amount of carbonate in final product at 350°C, at which the specimens synthesized at lower temperature, having lower, crystallinity and higher specific surface area, acquired a greater amount of carbonate. The result shows that Mg (OH) 2 with lower crystallinity favored the formation of carbonate due to its high chemical activity and specific surface area.
