Yang Ruizhi, Li Hong, Qiu Xinping, Chen Liquan
Institute of Physics, Chinese Academy of Sciences, Beijing, 100080, China.
Chemistry. 2006 May 15;12(15):4083-90. doi: 10.1002/chem.200501474.
Here we report a spontaneous combustion reaction in synthesizing Pt hollow capsules. In brief, Pt nanoparticles were loaded on the surface of colloidal carbon spheres by wet-chemical impregnation. When Pt-loaded carbon spheres were taken out of an argon-filled tube furnace at room temperature and exposed to air, they underwent spontaneous combustion. The internal carbon spheres templates were removed to leave nanostructured Pt hollow capsules. There are at least two critical conditions for the occurrence of the spontaneous combustion: the Pt particle size is below 5.8 nm, and the hydrogen content in the carbon spheres is above 2.570 wt %. Such a reaction is interesting for the preparation of metal hollow spheres and is also relevant with respect to removal of accumulated carbon on catalysts and for soot oxidation at room temperature.
在此，我们报道了在合成铂空心胶囊过程中发生的自燃反应。简而言之，通过湿化学浸渍法将铂纳米颗粒负载在胶体碳球表面。当负载铂的碳球在室温下从充满氩气的管式炉中取出并暴露于空气中时，它们会发生自燃。内部的碳球模板被去除，从而留下纳米结构的铂空心胶囊。自燃的发生至少有两个关键条件：铂颗粒尺寸低于5.8纳米，且碳球中的氢含量高于2.570 wt%。这样的反应对于金属空心球的制备很有趣，并且在去除催化剂上积累的碳以及室温下的烟灰氧化方面也具有相关性。
