J. Phys. IV France 7 (1997) C2-901-C2-902
The Structural Characteristics of the Dispersed State of CdO/γ-Al2O3 SystemX. Cai1, 2, Z. Ren1, 2, Z. Liu1, 2, Y. Xie1, 2, T. Hu1, 2 and Ya. Xie1, 2
1 Department of Chemistry, Peking University, Beijing 100871, P.R. China
2 Institute of High Energy Physics, Beijing 100039, P.R. China
A comparison between the FT functions of XAFS of CdO/γ-Al2O3 and NiO/γ-Al2O3 systems was carried out. The results show that their situations are very different. For the former, there is no Cd-Cd coordination peak corresponding to the first Cd-Cd coordination shell in the crystalline CdO and the coordination numbers of the first Cd-O shell decrease to 3.0. But after NiO disperses, Ni-O coordination numbers just decrease a little. The coordination numbers of the Ni-Ni shell corresponding to the first, even the farther Ni-Ni coordination shells of NiO remain partly. Maybe the differences between them are mainly due to the their different radii and the different fitness to the support.
© EDP Sciences 1997