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Prof. Makoto ONAKA “Unique Structural Properties of Tin Hydroxide Nanoparticles-embedded Montmorillonite (Sn-Mont) Demonstrating Its Efficient Acid Catalysis for Various Organic Reactions”
September 26, 2017 @ 5:00 pm
C O N F E R E N C E
Prof. Makoto Onaka
Graduate School of Arts and Sciences, The University of Tokyo
“Unique Structural Properties of Tin Hydroxide Nanoparticles-embedded Montmorillonite (Sn-Mont) Demonstrating Its Efficient Acid Catalysis for Various Organic Reactions”
We originally developed tin hydroxide nanoparticles-embedded montmorillonite (Sn-Mont) by the simple treatment of sodium ion-exchanged montmorillonite (Na-Mont) with aqueous SnCl4, and the physical and chemical properties of Sn-Mont were investigated by N2 adsorption, XRD, TG, TEM, 119Sn MAS NMR, and XAFS analyses. It was revealed that Sn-Mont was composed of Sn(OH)4-based nanoparticles of less than 3 nm in diameter surrounded by delaminated aluminosilicate layers. The arrangement of each aluminosilicate layer in the Sn-Mont is not laminated like that of the parent Na-Mont, but almost completely disordered to make a porous structure with a high surface area and a large pore volume that embraces the tin hydroxide-based nanoparticles. The intrinsic solid acid catalysis of Sn-Mont was successfully applied for the various organic reactions involving bulky reactants and products, which was ascribed to the smooth reactant/product transfers in the micro/meso pores as well as the acidic property derived from the contact of the nano-Sn(OH)4 and the delaminated aluminosilicate layers.
Mardi 26 septembre 2017
ISIS, salle de conférence – 8 allée Gaspard Monge, Campus Esplanade