Dae-Soo Han

Amino-functionalized SBA-15 type mesoporous silica having nanostructured hexagonal platelet morphology

Amino-functionalized SBA-15 type mesoporous silicas having unique hexagonal platelet morphologies with short channels (100-300 nm) running parallel to the thickness of the nanostructured hexagonal platelet type morphologies have been directly synthesized by co-condensation of aminopropyltriethoxysilane (APTES) and sodium metasilicate as a silica source in the presence of Pluronic P123 triblock copolymer as a structure directing agent.

Microwave assisted-direct synthesis of highly ordered large pore functionalized mesoporous SBA

Microwave sysnthesis has been successfully applied for the direct synthesis of organo-functionalized SBA-15 and 16 mesoporous materials through the co-condensations of organosilanes with sodium metasilicate in the presence of triblock copolymers as structure directing agents. The obtained materials have large pores, long range order of cubic and hexagonal mesostructures, and the loading of organo groups up to 10% of the silica frameworks.

Microwave synthesis of Fe-SBA-16 mesoporous silica and Friedel-Crafts type reaction

Iron-substituted SBA-16 materials have been synthesized by using direct microwave synthesis method under weak acidic conditions. Different iron species including isolated framework iron species, iron cluster and iron oxides were formed by adjusting the pH value and Si/Fe molar ratios. All the materials has been characterized by XRD, N 2 sorption and SEM. Lewis acid catalyzed Friedel-Crafts type alkylation reaction of benzene with benzylchloride has been investigated over Fe catalysts prepared with different pH values and iron contents.