Sonochemical preparation, nanoparticles palladium

Okitsu K, Nagaoka S, Tanabe S, Matsumoto H, Mizukoshi Y, Nagata Y (1999) Sonochemical preparation of size-controlled palladium nanoparticles on alumina surface. Chem Lett 28 271-272... 

Okitsu K, Yue A, Tanabe S, Matsumoto H (2000) Sonochemical preparation and catalytic behavior of highly dispersed palladium nanoparticles on alumina. Chem Mater 12 3006-3011... 

Mizukoshi Y, Okitsu K, Yamamoto T, Oshima J, Nagata Y, Maeda Y (1997) Sonochemical preparation of bimetallic nanoparticles of gold/palladium in aqueous solution. J Phys Chem B 101 7033-7037... 

Okitsu K, Mizukoshi Y, Bandow H, Maeda Y, Yamamoto T, Nagata Y. Formation of the noble metal nanoparticles by ultrasonic irradiation. Ultrason Sonochem. 1996 3 S249-51. Okitsu K, Bandow H, Maeda Y. Sonochemical preparation of ultrafine palladium nanoparticles. Chem Mater. 1996 8 315-7. 

Other one-pot preparations of bimetallic nanoparticles include NOct4(BHEt3) reduction of platinum and ruthenium chlorides to provide Pto.sRuo.s nanoparticles by Bonnemann et al. [65-67] sonochemical reduction of gold and palladium ions to provide AuPd nanoparticles by Mizukoshi et al. [68,69] and NaBH4 reduction of dend-rimer—PtCl4 and -PtCl " complexes to provide dend-rimer-stabilized PdPt nanoparticles by Crooks et al. [70]. 

Palladium metallic clusters have been prepared at room temperature by sonochemical reduction of Pd(OAc)2 and a surfactant, myristyltrimethylammonium bromide, in THE or MeOH [160[. It is noteworthy that nanosized amorphous Pd is obtained in THE, but in a crystalline form in MeOH. In this solvent, and in higher homologous alcohols, sonolysis of tetrachloropalladate(II) leads to Pd nanoclusters in which carbon atoms, formed by complete decomposition of the solvent, can diffuse. This results in an interstitial solid having the formula PdQ (0 < x < 0.15) [161]. Noble metal nanoparticles of Au, Pd, and Ag are obtained by sonicating aqueous solutions of the corresponding salts in the presence of a surfactant, which largely stabilise the naked col-... 

Highly dispersed palladium nanoparticles immobilized on alumina were prepared via the sonochemical reduction by alcohols of Pd(II).366 The activity of these catalysts was 3-7 times higher in the hydrogenation of alkenes than that of conventional catalysts, and they showed a high preference to hydrogenate 1-hexene over trans-3-hexene. 

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