Palladium Nanoparticles Encapsulated in Hollow Titanosilicate Spheres as an Ideal Nanoreactor for One-pot Oxidation

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• 作者：Dr. Yasutaka Kuwahara ; Takahiro Ando ; Hiroto Kango and Prof. Dr. Hiromi Yamashita
• 刊名：Chemistry - A European Journal
• 出版年：2017
• 出版时间：January 5, 2017
• 年：2017
• 卷：23
• 期：2
• 页码：380-389
• 全文大小：2345K
• ISSN：1521-3765

文摘

One-pot reaction involving Pd-catalyzed H₂O₂ production from H₂ and O₂ and Ti-catalyzed successive oxidation with H₂O₂ in a single reaction vessel is an alluring strategy for the synthesis of targeted chemicals in terms of sustainability and economic competitiveness. In this study, a yolk–shell nanostructured catalyst, consisting of Pd nanoparticles (NPs) with core diameter ca. 4.0 nm and a porous titanosilicate shell of ca. 15 nm thickness, was fabricated by using an oil-in-water (O/W) microemulsion-based interfacial self-assembly approach. Compared with prototype titanosilicate-supported Pd NP catalysts and core–shell structured analogues, the yolk–shell nanostructured catalyst exhibited superior catalytic efficiency in the one-pot oxidation reaction of sulfides with 83 % H₂O₂ utilization efficiency, because of the productive effect of the titanosilicate shell in limiting the diffusion of H₂O₂ generated in situ over the encapsulated Pd NPs and the efficient access of the H₂O₂ to the neighboring active Ti sites. This study provides promising avenues for the development of multifunctional nanostructured catalysts that are useful for one-pot reactions.