Kadriye Ozlem Hamaloglu

Hacettepe University, Turkey

Title: Monodisperse porous cerium dioxide and manganese dioxide microspheres decorated with Iridium and Palladium nanoparticles for oxidation reactions

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Biography

Kadriye Özlem Hamalo?lu graduated from Hacettepe University Chemical Engineering Department in 2007. She was awarded with TÜB?TAK scholarship for her M.Sc. and PhD. She completed her PhD on ‘Synthesis and catalytic applications of metal oxide based materials in particulate form’ in 2015 from the same university. She was a visiting scientist at RWTH Aachen University, Aachen, Germany during 2011-2012. Dr. Hamalo?lu is currently interested in the synthesis of functional materials for catalytic applications.

Abstract

Noble metal nanoparticles can perform catalytic activity without a solid support in different catalytic applications. However, the reusability of noble metal nanoparticles is not possible due to their low stability and low catalytic activity because of aggregation. Therefore, to keep the active catalyst in the dispersed state in the reaction medium and to remove the catalyst from the reaction medium easily and reuse the catalyst, immobilization of noble nanoparticles on porous supports with high surface areas can be used. In this purpose, different monodisperse mesoporous microspheres like silicon dioxide, titanium dioxide, cerium dioxide and manganese dioxide were synthesized and has been used as catalyst supports, due to their porous structures and high surface areas, for the immobilization of different noble metal nanoparticles in our group.

Methacrylate based monodisperse-polymeric microspheres were used as templates, which controls the morphological property such as porous properties, particle shape and size, for the synthesis of monodisperse- porous microspheres by a multi-stage sol-gel templating method. The template is removed from the composite structure after formation of composite microspheres containing both inorganic and organic matrices. Nobel metal nanoparticles (i.e. palladium and iridium) were synthesized by reducing of the salts of noble metals. The nanoparticles were then immobilized on microspheres via different organic ligands. The obtained catalysts have demonstrated desirable catalytic properties across the oxidation reactions. Palladium and iridium nanoparticle decorated-monodisperse-porous cerium dioxide and manganese dioxide microspheres were tried as an efficient catalyst for benzyl alcohol oxidation and water oxidation reactions, respectively.