13. 超音波による貴金属ナノ粒子担持材料の調製とその触媒作用

概要

論文の詳細を見る
Pd nanoparticles dispersed on alumina were prepared via the sonochemical reduction of tetrachloropalladate(II) (Pd(II)) in an aqueous solution. The reduction of Pd(II) to metallic Pd successfully proceeded even in the presence of alumina powder. The rates of Pd(II) reduction were dependent on the type of alcohol additive, which acts as an effective accelerator for Pd(II) reduction. The size of sonochemically formed Pd nanoparticles could be controlled by selecting the type of alcohol additive and the amount of coexisting alumina. Based on the analyses of the irradiated solution and the resulting powder by UV-VIS, pH and TEM, the formation mechanism of the supported materials was proposed. The catalytic activities of the prepared materials were investigated for the hydrogenation of olefins at ambient temperature. The rates of the hydrogenation were much higher than those of a conventionally prepared Pd/alumina catalyst and a commercial Pd black one. The activities and selectivities were also dependent on the catalysts prepared by different methods. In addition, Au/Pd nanoparticles supported on silica were also prepared by two successive processes composed of sonochemical reduction and sol-gel method. Characterization by TEM, XRD and UV-VIS, etc. and catalytic activities of these materials were investigated.
日本ソノケミストリー学会の論文