CO adsorption and decomposition on Pd/Al2O3 studied by time-resolved XAFS using dispersive optics

16th International Conference on X-ray Absorption Fine Structure

Matsumura, D.^1 ; Okajima, Y.^2 ; Nishihata, Y.^1

Quantum Beam Science Center, Japan Atomic Energy Agency, 1-1-1 Koto, Sayo, Hyogo

679-5165, Japan^1

SPring-8 Service Co. Ltd., 1-20-1 Shingu-cho Koto, Tatsuno, Hyogo

679-0077, Japan^2

关键词: Adsorption behavior;    Debye Waller factor;    Inter-atomic distances;    Pd metal nanoparticles;    Surface structural changes;    Temperature increase;    Time-resolved XAFS;    X-ray absorption fine structure techniques;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/712/1/012042/pdf
DOI  :  10.1088/1742-6596/712/1/012042

来源: IOP

【 摘 要 】

We have studied surface structural change of supported Pd metal nanoparticles caused by CO adsorption and following temperature increase by using in situ and time-resolved X- ray absorption fine structure technique with dispersive optics. CO adsorption on Pd metal nanoparticles at room temperature shows two types of adsorption behavior and the less stable CO which brings about surface expansion of Pd metal nanoparticles is desorbed just after temperature increase. Pd carbide layer is created at around 350 °C by CO decomposition, which was clearly detected by the elongation of Pd-Pd interatomic distance and the increase of Debye-Waller factor and third cumulant.