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首页> 外文期刊>Materials Science and Engineering. B, Solid-State Materials for Advanced Technology >Influence of solvents on the formation of Pd and PdO nanoparticles in SBA-15
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Influence of solvents on the formation of Pd and PdO nanoparticles in SBA-15

机译：溶剂对SBA-15中Pd和PdO纳米颗粒形成的影响

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摘要

SBA-15 supported Pd and PdO nanoparticles have been synthesized and compared in three different solvents, ethanol (EtOH), tetrahydrofuran (THF), and supercritical carbon dioxide (scCO_2). The particle size distribution and dispersion are strongly influenced by the nature of solvents. When the impregnation of Pd(hfac)_2 on SBA-15 without surface functionalization is carried out in ethanol, strong aggregation of Pd nanoparticles is induced on the external surface during evaporation and the size distribution is extremely poor. Loading of Pd precursors in THF induces PdO and Pd nanoparticles both in the mesoporous channels and on the external surface of the silica support. However, the particles even on the external surface are relatively well dispersed and the growth of particle is not significant. In contrast, the impregnation of Pd(hfac)_2 precursor in scCO_2 solvent results in well dispersed Pd and PdO nanoparticles in the mesoporous channels of SBA-15, where the particle size (～6 nm) is limited by the mesopore diameter.
机译：已经合成了SBA-15负载的Pd和PdO纳米颗粒，并在三种不同的溶剂（乙醇（EtOH），四氢呋喃（THF）和超临界二氧化碳（scCO_2））中进行了比较。粒度分布和分散度受溶剂性质的强烈影响。当在乙醇中将Sd-15上的Pd（hfac）_2浸渍而不进行表面功能化时，在蒸发过程中会在外表面上诱导Pd纳米颗粒强烈聚集，并且尺寸分布非常差。 Pd前体在THF中的负载会在介孔通道和二氧化硅载体的外表面上诱导PdO和Pd纳米颗粒。然而，即使在外表面上的颗粒也相对分散，并且颗粒的生长不显着。相比之下，Pd（hfac）_2前体在scCO_2溶剂中的浸渍会导致SBA-15介孔通道中的Pd和PdO纳米颗粒充分分散，其粒径（〜6 nm）受中孔直径限制。

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