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

分散型光学系を用いた時分割XAFSによるパラジウム微粒子上の一酸化炭素吸着及び分解の観測

松村 大樹   ; 岡島 由佳*; 西畑 保雄

Matsumura, Daiju; Okajima, Yuka*; Nishihata, Yasuo

We have studied surface structural change of supported Pd metal nanoparticles caused by CO adsorption and following temperature increase by using 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.