School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, China.
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing Tech University, Nanjing, 210009, China.
Sci Rep. 2017 Jul 3;7(1):4509. doi: 10.1038/s41598-017-04346-9.
In this work, Pt nanoparticles were incorporated into SBA-15 to prepare the materials for hydrogen spillover adsorption. We provide a direct modification (DM) strategy to improve the content of Pt nanoparticles inside the channels of SBA-15. In this strategy, the Pt precursor was directly incorporated into as synthesized SBA-15 by a solid-state grinding method. The subsequent calcination in air, then H/Ar gases was conducted to obtain the resultant materials of PtAS. For the samples of PtAS, Pt nanoparticles up to 5.0 wt% have a high dispersion inside the channels of SBA-15. The size of nanoparticles is in control of 3.7 nm. Although much work so far has focused on modification of SBA-15 with Pt nanoparticles. Here, it is the first time the loading amount of Pt nanoparticles raises up to 5.0 wt%, and the location of the Pt nanoparticles is interior channels of SBA-15. We reveal that the high dispersion behaviors of Pt nanoparticles are ascribed to the nanoconfinement effects provided by as synthesized SBA-15. However, the samples derived from template free SBA-15 (PtCS) show sparsely dispersion of Pt nanoparticles with the size of 7.7 nm. We demonstrate that the PtAS samples show better hydrogen adsorption performance than PtCS.
在这项工作中，将 Pt 纳米颗粒掺入 SBA-15 中，以制备用于氢溢出吸附的材料。我们提供了一种直接修饰（DM）策略来提高 SBA-15 通道内 Pt 纳米颗粒的含量。在该策略中，Pt 前体通过固态研磨法直接掺入合成的 SBA-15 中。随后在空气中进行煅烧，然后在 H/Ar 气体中进行煅烧，以获得 PtAS 的产物材料。对于 PtAS 样品，高达 5.0wt%的 Pt 纳米颗粒在 SBA-15 的通道内具有高分散性。纳米颗粒的尺寸在 3.7nm 左右。尽管迄今为止已经有大量工作集中在用 Pt 纳米颗粒修饰 SBA-15 上。在这里，Pt 纳米颗粒的负载量首次提高到 5.0wt%，并且 Pt 纳米颗粒的位置位于 SBA-15 的内部通道中。我们揭示了 Pt 纳米颗粒的高分散行为归因于合成的 SBA-15 提供的纳米限域效应。然而，源自无模板 SBA-15 的样品（PtCS）显示出 Pt 纳米颗粒的分散性较差，尺寸为 7.7nm。我们证明了 PtAS 样品比 PtCS 具有更好的氢气吸附性能。
