Study of coordination environments around Pd and Pt in a Pd-core Pt-shell nanoparticle during heating

16th International Conference on X-ray Absorption Fine Structure

Nishimura, Y.F.^1 ; Hamaguchi, T.^1 ; Yamaguchi, S.^1 ; Takagi, H.^1 ; Dohmae, K.^1 ; Nonaka, T.^1 ; Nagai, Y.^1

Toyota Central RandD Labs., Inc., Aichi

480-1192, Japan^1

关键词: Atomic mixing;    Catalytic properties;    Coordination environment;    Core shell;    Core shell structure;    Local coordination;    Shell nanoparticles;    Temperature range;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/712/1/012067/pdf
DOI  :  10.1088/1742-6596/712/1/012067

来源: IOP

【 摘 要 】

Local coordination environments around Pd and Pt in a Pd-core Pt-shell nanoparticle (NP) at temperatures ranging from 473 to 873 K was evaluated by utilizing in situ XAFS measurement technique to investigate the temperature range in which a core-shell structure is preserved. The core-shell structure was considered to be kept up to 673 K and start to change at about 773 K. Heating to 873 K accelerated atomic mixing in the core-shell NPs. Catalytic properties of the present Pd-core Pt-shell NP are available in the stoichiometric C3H6-O2atmosphere at temperatures less than 773 K at most.