The Structural Characteristics Of The Dispersed State Of Cdo/Gamma-Al2o3 System

A comparison between the FT functions of XAFS of CdO/gamma-Al2O3 and NiO/gamma-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.