Ultrathin Coating of Confined Pt Nanocatalysts by Atomic Layer Deposition for Enhanced Catalytic Performance in Hydrogenation Reactions
Ultrathin Coating of Confined Pt Nanocatalysts by Atomic Layer Deposition for Enhanced Catalytic Performance in Hydrogenation Reactions
复制标题
通过原子层沉积对受限 Pt 纳米催化剂进行超薄涂层，以增强加氢反应的催化性能
DOI：
10.1002/chem.201601039
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Qin Yong
中科院分区：
文献类型：
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作者：
Wang Meihua;Gao Zhe;Zhang Bin;Yang Huimin;Qiao Yan;Chen Shuai;Ge Huibin;Zhang Jiankang;Qin Yong
金属-载体界面在多相催化中起着重要作用。然而，定制金属支撑界面以实现充分利用仍然是一个重大挑战。在这项工作中，我们提出了一种优雅的策略，通过用氧化物层涂覆受限的纳米颗粒来最大化金属氧化物界面。这是通过原子层沉积（ALD）在碳纳米线圈模板上顺序沉积Al 2 O3涂层、Pt和厚Al 2 O3层，然后去除模板来实现的。与未包覆的Pt/Al 2 O3纳米管相比，包覆的Pt/Al 2 O3纳米管具有更大的Pt-Al 2 O3界面。最大化的界面显著提高了对硝基苯酚加氢反应的活性，保护性的Al 2 O3纳米管保持了反应的稳定性。我们相信，在受限催化剂上应用ALD涂层是一种有前途的方法，可以提高其他催化剂的性能。
Metal‐support interfaces play a prominent role in heterogeneous catalysis. However, tailoring the metal‐support interfaces to realize full utilization remains a major challenge. In this work, we propose a graceful strategy to maximize the metal‐oxide interfaces by coating confined nanoparticles with an ultrathin oxide layer. This is achieved by sequential deposition of ultrathin Al2O3coats, Pt, and a thick Al2O3layer on carbon nanocoils templates by atomic layer deposition (ALD), followed by removal of the templates. Compared with the Pt catalysts confined in Al2O3nanotubes without the ultrathin coats, the ultrathin coated samples have larger Pt–Al2O3interfaces. The maximized interfaces significantly improve the activity and the protecting Al2O3nanotubes retain the stability for hydrogenation reactions of 4‐nitrophenol. We believe that applying ALD ultrathin coats on confined catalysts is a promising way to achieve enhanced performance for other catalysts.