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火凤翱翔

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[资源] Nature Communication 镁铝尖晶石负载高稳定性Pt纳米颗粒 800℃空气煅烧七天！！

The development of thermally stable, nanometer-sized precious metal-based catalysts
remains a daunting challenge. Such materials, especially those based on the use of costly
platinum metal, are essential and, to date, non-replaceable for a large number of industrially
important catalytic processes. Here we report a well-defined cuboctahedral MgAl2O4 spinel
support material that is capable of stabilizing platinum particles in the range of 1–3nm on its
relatively abundant {111} facets during extremely severe aging at 800 C in air for 1 week. The
aged catalysts retain platinum dispersions of 15.9% with catalytic activities for methanol
oxidation being B80% of that of fresh ones, whereas a conventional Pt/g-Al2O3 catalyst is
severely sintered and nearly inactive. We reveal the origin of the markedly superior ability of
spinel {111} facets, resulting from strong interactions between spinel surface oxygens
and epitaxial platinum {111} facets, inspiring the rational design of anti-sintering supported
platinum group catalysts.

发展具有热稳定性的纳米贵金属催化剂至今仍是一个挑战性很大的课题。这些材料尤其是
基于价格昂贵的Pt的材料仍然是不可取代的工业催化剂。本文以形貌控制良好的十四面体
的MgAl2O4作为载体负载1-3 nm的Pt纳米粒子，MgAl2O4的暴露面以{111}为主，Pt/MgAl2O4
在800℃下煅烧七天，Pt纳米粒子仍然稳定在1-3 nm。Pt纳米粒子高稳定性的原因是MgAl2O4
的{111}面上的O原子与外延Pt{111}面的Pt原子发生强相互作用。
此发现为设计高稳定性的负载型Pt基催化剂指明了一定的方向。题目：Stable platinum nanoparticles on specific MgAl2O4 spinel facets at high temperatures in oxidizing atmospheres
年份：2013年

调节金属和载体的晶格匹配性为设计高热稳定性的催化剂提供了方法。晶格匹配性高能够降低两者界面处的自由能，进而稳定住金属纳米粒子。

[ Last edited by 火凤翱翔 on 2015-12-4 at 12:15 ]

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2015-11-30 16:56:59, 4.74 M