Structure of Bimetallic Particles: Nonequimolar Graphite-Supported Fe−Pd
Structure of Bimetallic Particles: Nonequimolar Graphite-Supported Fe−Pd
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双金属颗粒的结构：非等摩尔石墨负载的 Fe−Pd
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
J. Phillips
中科院分区：
文献类型：
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作者：
R. Wunder;J. Phillips
本研究建立了体积不溶性对石墨负载的FePd催化剂颗粒的体积和表面结构的影响。穆斯堡尔谱、X射线衍射和气体吸附微量热分析表明，富铁FePd/Grafoil催化剂颗粒由金属铁和FePd合金的热稳定分凝态组成，这与两相的体相不相容性相一致。这表明，在具有弱金属载体相互作用的催化剂颗粒中操纵金属化学计量提供了另一种改变颗粒结构并因此改变催化化学的手段。
This investigation established the effects of bulk immiscibility on the bulk and surface structure of FePd catalyst particles supported on graphite. By use of Mossbauer effect spectroscopy, X-ray diffraction and gas-adsorption microcalorimetry, it was shown that iron-rich FePd/Grafoil catalyst particles consist of thermodynamically stable segregated states of metallic iron and FePd alloy in accordance with the bulk immiscibility of the two phases. This indicates that manipulation of metal stoichiometry in bimetallic catalyst particles with weak metal support interaction provides another means to modify particle structure and hence catalytic chemistry.