title: Synthesis and characterization of magnesium oxide supported catalysts with a meso-macropore structure.
abstract: Nanostructured magnesium oxide catalyst support materials with controlled morphology and size were synthesized from a supercritical carbon dioxide/ethanol solution via chemical reaction of soluble precursors and subsequent thermal decomposition. Leaf-like magnesium hydroxide precursors with high specific surface area were formed by a low-temperature chemical reaction at below 140 degrees C, while magnesium carbonate cubes with a very low surface area less than 3.3 m2/g were formed by temperature-induced phase transition from a loose to a dense structure during carbonation reaction at above 150 degrees C. The specific surface area has significantly increased higher than 90 m2/g due to the creation of highly porous MgO cubes with mesopore structure formed after thermal decomposition of the magnesium carbonate precursors. Ni-magnesium oxide catalysts with bimodal pore structure were finally formed by the consequence of packing heterogeneity of the porous magnesium oxides with different morphologies and sizes.
authors.affiliation: Clean Energy Research Center, Korea Institute of Science and Technology, 39-1 Haweolgok-Dong, Korea.
authors.forename: Sang Woo
authors.initials: SW
authors.lastname: Kim
authors.forename: Inho
authors.initials: I
authors.lastname: Kim
authors.forename: Dong Ju
authors.initials: DJ
authors.lastname: Moon