Shape changes of supported Rh nanoparticles during oxidation and reduction cycles

被引：195

作者：

Nolte, P. ^{[1
]}

Stierle, A. ^{[1
]}

Jin-Phillipp, N. Y. ^{[1
]}

Kasper, N. ^{[1
]}

Schulli, T. U. ^{[2
]}

Dosch, H. ^{[1
]}

机构：

[1] Max Planck Inst Met Res, D-70569 Stuttgart, Germany

[2] Comis Nacl Energia Atom, Inst Nanosci & Cryogenie, Serv Phys Mat & Microstruct, F-38054 Grenoble 09, France

来源：

SCIENCE | 2008年 / 321卷 / 5896期

关键词：

D O I：

10.1126/science.1160845

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The microscopic insight into how and why catalytically active nanoparticles change their shape during oxidation and reduction reactions is a pivotal challenge in the fundamental understanding of heterogeneous catalysis. We report an oxygen- induced shape transformation of rhodium nanoparticles on magnesium oxide ( 001) substrates that is lifted upon carbon monoxide exposure at 600 kelvin. A Wulff analysis of high- resolution in situ x- ray diffraction, combined with transmission electron microscopy, shows that this phenomenon is driven by the formation of a oxygen- rhodium- oxygen surface oxide at the rhodium nanofacets. This experimental access into the behavior of such nanoparticles during a catalytic cycle is useful for the development of improved heterogeneous catalysts.

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页码：1654 / 1658

页数：5

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