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 powderon their carbonation reactivity using synthesized Mg (OH) 2. Three types of Mg (OH)2 specimens were prepared using autoclave at 60℃,120℃ and 180℃, respectively. These were analyzed using X-ray diffraction, scanning electron microscopy , thermal analysis method and BET method. Difference of synthetic temperature has

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... d 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℃,375℃and 400℃in CO2 as carbonation experiments, respectively. Each specimen acquired the greatest amount of carbonate in final product at 350℃, 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.