2014 年 72 巻 3 号 p. 268-279
Inorganic metal oxides-supported metal nanoparticle catalysts are designed for green molecular transformation system. The supported metal nanoparticle catalysts such as hydrotalcite-supported gold and silver nanoparticles show unique and excellent catalytic activities for versatile organic reactions such as aerobic oxidations, oxidative carbonylations, and chemoselective reductions of epoxides to alkenes and nitrostyrenes to aminostyrenes using alcohols and CO/H2O as reducing reagents. These high catalytic performances are derived from the cooperative effect between metal nanoparticles and supports. Furthermore, as a new strategy for increasing the metal-support interaction, core-shell nanoparticles consisting of active metal nanoparticles in the core with metal oxide supports in the shell are designed to maximize their metal nanoparticle-support interface areas. These core-shell nanocomposite catalysts exhibit excellent chemoselective hydrogenation of nitrostyrenes to aminostyrenes, unsaturated aldehydes to allyl alcohols, and alkynes to alkenes. Moreover, these solid catalysts developed are easily recovered from the reaction mixture by simple filtration and reusable with retaining their high catalytic activities.