Eberhardt Dario, Migowski Pedro, Teixeira Sérgio R, Feil Adriano F
PUCRS, Centro Interdisciplinar de Nanociências e Micro-Nanotecnologia (NanoPUC), Av. Ipiranga, 6681, CEP 90619-900, Porto Alegre, RS, Brazil.
UFRGS, Instituto de Física, Av. Bento Gonçalves, 9500, CEP 91501-970, Porto Alegre, RS, Brazil.
J Nanosci Nanotechnol. 2018 Mar 1;18(3):2075-2078. doi: 10.1166/jnn.2018.13973.
A simple method based on sputtering deposition of Pd onto mesoporous SiO2 (SBA-15) was employed to produce supported Pd nanoparticles (NPs) that can be used as hydrogenation catalysts. The use of sputtering deposition eliminates contaminants and avoids additional drawbacks of traditional chemical methods applied to prepare heterogeneous supported metal catalysts. A mechanical resonant stirrer was used to revolve the SBA-15 powder and ensure homogeneous distribution of the Pd NPs over the support. The SBA-15 pores act as templates for Pd NPs and drive nanostructure growth. Consequently, the NPs obtained have the same diameter as that of the SBA-15 channels (~5 nm) and elongated particles are formed as sputtering deposition increases. The SBA-15 supported Pd NPs (Pd NPs/SBA-15) were tested in a probe hydrogenation of cyclohexene reaction to evaluate the catalytic activity of the Pd NPs. Turnover frequency (TOF) of 2000 min-1 were achieved with the lower Pd NPs concentration (0.15 wt%) catalyst.
采用一种基于将钯溅射沉积到介孔二氧化硅（SBA - 15）上的简单方法来制备负载型钯纳米颗粒（NPs），该纳米颗粒可用作氢化催化剂。溅射沉积的使用消除了污染物，并避免了应用于制备多相负载型金属催化剂的传统化学方法的其他缺点。使用机械共振搅拌器使SBA - 15粉末旋转，以确保钯纳米颗粒在载体上均匀分布。SBA - 15孔作为钯纳米颗粒的模板并驱动纳米结构生长。因此，所获得的纳米颗粒具有与SBA - 15通道相同的直径（约5纳米），并且随着溅射沉积增加形成细长颗粒。在环己烯反应的探针氢化中测试了SBA - 15负载的钯纳米颗粒（Pd NPs/SBA - 15），以评估钯纳米颗粒的催化活性。较低钯纳米颗粒浓度（0.15 wt%）的催化剂实现了2000 min⁻¹的周转频率（TOF）。
