Fabrication of Efficient Hydrogenation Nanoreactors by Modifying the Freedom of Ultrasmall Platinum Nanoparticles within Yolk-Shell Nanospheres.
Fabrication of Efficient Hydrogenation Nanoreactors by Modifying the Freedom of Ultrasmall Platinum Nanoparticles within Yolk-Shell Nanospheres.
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DOI：
10.1002/chem.201500762
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发表时间：
2015-07
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影响因子：
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通讯作者：
Juan Peng;Guojun Lan;M. Guo;Xuming Wei;Can Li;Qihua Yang
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文献类型：
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作者：
Juan Peng;Guojun Lan;M. Guo;Xuming Wei;Can Li;Qihua Yang
报道了用聚酰胺胺稳定的超小铂纳米颗粒（Pt NPs）限制的二氧化硅基蛋黄壳纳米球的合成，其中Pt NPs与载体之间的相互作用强度可以容易地调节。通过巧妙地利用具有不同表面润湿性（亲水性与疏水性）的二氧化硅核作为吸附剂，Pt NP可以被限制在蛋黄-壳纳米反应器的不同位置（核与中空壳），并且因此表现出与纳米反应器的不同相互作用强度（强与弱）。有趣的是，发现当超疏水内核材料（SiO2 -Ph），这导致制备固定化催化剂（Pt@SiO2-Ph）;它与载体的相互作用强度最弱，催化活性最高（环己烯和硝基苯的氢化分别为88 500和7080 h（-1）），这是由于其不受Pt NPs自由度的影响而保留了固有性质。
The synthesis of silica-based yolk-shell nanospheres confined with ultrasmall platinum nanoparticles (Pt NPs) stabilized with poly(amidoamine), in which the interaction strength between Pt NPs and the support could be facilely tuned, is reported. By ingenious utilization of silica cores with different surface wettability (hydrophilic vs. -phobic) as the adsorbent, Pt NPs could be confined in different locations of the yolk-shell nanoreactor (core vs. hollow shell), and thus, exhibit different interaction strengths with the nanoreactor (strong vs. weak). It is interesting to find that the adsorbed Pt NPs are released from the core to the hollow interiors of the yolk-shell nanospheres when a superhydrophobic inner core material (SiO2 -Ph) is employed, which results in the preparation of an immobilized catalyst (Pt@SiO2-Ph); this possesses the weakest interaction strength with the support and shows the highest catalytic activity (88 500 and 7080 h(-1) for the hydrogenation of cyclohexene and nitrobenzene, respectively), due to its unaffected freedom of Pt NPs for retention of the intrinsic properties.