A spontaneous combustion reaction for synthesizing Pt hollow capsules using colloidal carbon spheres as templates.
A spontaneous combustion reaction for synthesizing Pt hollow capsules using colloidal carbon spheres as templates.
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DOI：
10.1002/chem.200501474
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发表时间：
2006-05
期刊：
影响因子：
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通讯作者：
Ruizhi Yang;Hong Li;X. Qiu;Liquan Chen
中科院分区：
文献类型：
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作者：
Ruizhi Yang;Hong Li;X. Qiu;Liquan Chen
在这里，我们报告了合成PT空心胶囊中的自发燃烧反应。简而言之，通过湿化学浸渍，将Pt纳米颗粒加载在胶体碳球的表面上。当Pt负载的碳球从室温从充满氩气的管炉中取出并暴露于空气时，它们会自发燃烧。移除内部碳球模板以留下纳米结构的PT空心胶囊。自发燃烧的发生至少有两个关键条件：PT粒径低于5.8 nm，并且碳球中的氢含量高于2.570 wt％。这种反应对于制备金属空心球很有趣，并且与去除催化剂上的累积碳和在室温下的烟灰氧化有关。
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.