In situ XRD Studies on Heat-treated PtRu/C Nanocatalysts  

作　　者：LIU Juan-ying LI Zhi-lin VOGEL Walter YANG Hui 

机构地区：[1]Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences,Shanghai 200050,P.R.China [2]Department of Chemistry,National Central University,Taoyuan 32001,Taiwan,P.R.China [3]Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201203,P.R.China

出　　处：《Chemical Research in Chinese Universities》2012年第3期511-515,共5页高等学校化学研究（英文版）

基　　金：Supported by the National Natural Science Foundation of China(No.21073219);the Youth’s Innovation Fund of the Shanghai Institute of Microsystem and Information Technology,China(No.2010)

摘　　要：Extremely small PtRu/C nanocatalysts were prepared via a carbonyl route. A thorough in situ reduction X-ray structural characterization of these catalysts was performed. After synthesis and storage under ambient condi- tions, the diffraction patterns of PtRu/C catalysts were seriously modified, indicating the surface oxide formation. In the reduced state, the particle size is around 2 nm. The observed relative fluctuations of lattice constants are 3%, which is far too large to be explained by a compositional fluctuation. Their origin is attributed to strong but isotropic strains and is related to the alloy formation. The annealing experiments show all the catalysts present an exceptional thermal stability when annealed in inert ambient, especially that of the Pt1Ru1/C catalyst. Besides, it is interesting to note that there is no thermal expansion evidence from the patterns.Extremely small PtRu/C nanocatalysts were prepared via a carbonyl route. A thorough in situ reduction X-ray structural characterization of these catalysts was performed. After synthesis and storage under ambient condi- tions, the diffraction patterns of PtRu/C catalysts were seriously modified, indicating the surface oxide formation. In the reduced state, the particle size is around 2 nm. The observed relative fluctuations of lattice constants are 3%, which is far too large to be explained by a compositional fluctuation. Their origin is attributed to strong but isotropic strains and is related to the alloy formation. The annealing experiments show all the catalysts present an exceptional thermal stability when annealed in inert ambient, especially that of the Pt1Ru1/C catalyst. Besides, it is interesting to note that there is no thermal expansion evidence from the patterns.

关 键 词：In situ X-ray diffraction PtRu/C nanocatalyst Thermal stability 

分 类 号：TQ426.6[化学工程] TG139.8[一般工业技术—材料科学与工程]