Size-Controlled Synthesis and Catalytic Performance of Pt Nanoparticles in Micro- and Mesoporous Silica Prepared Using Supercritical Solvents


  • We gratefully acknowledge Prof. A. Fukuoka at Hokkaido University for useful suggestions, Y. Akimoto for the TEM observations, Y. Kawai for the elemental analyses, and A. Morikawa for measurement of the catalytic performance.


A novel impregnation process using a supercritical fluid (SCF) solvent to generate size-controlled Pt nanoparticles in micro- and mesoporous silica hosts with a uniform pore size (see Figure) is presented. The size of the Pt nanoparticles decreases with the pore size of silica hosts, and the SCFs are shown to be excellent solvents for the introduction of nanoparticles into fine spaces on a nanometer scale.