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Surface modification of MgO microcrystals by cycles of hydration-dehydration

Authors
Kim, HJKang, JSong, MYPark, SHPark, DGKweon, HJNam, SS
Issue Date
Jul-1999
Publisher
KOREAN CHEMICAL SOC
Citation
BULLETIN OF THE KOREAN CHEMICAL SOCIETY, v.20, no.7, pp.786 - 790
Journal Title
BULLETIN OF THE KOREAN CHEMICAL SOCIETY
Volume
20
Number
7
Start Page
786
End Page
790
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/16829
ISSN
0253-2964
Abstract
Relatively inert surface of microcrystalline MgO was modified into chemically active one by carrying out controlled hydration followed by dehydration at elevated temperature under dynamic vacuum. Even though the treatment by the first cycle of hydration-dehydration did not alter the porosity of MgO, it largely enhanced surface reactivity of the MgO toward adsorbed water, turning its outer layer into brucite upon rehydration. Treatment by the second cycle of hydration-dehydration generated micropores, and slit-shaped mesopores, raising the porosity of the MgO. The overlayer of Fe2O3 Of the core/shell type composite magnesium oxide enhanced this surface modification, turning its surface into more porous and more active one than that of uncoated MgO, after the treatment by the hydration-dehydration.
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