日本ゼオライト学会　刊行物 Publication of Japan Zeolite Association

XANES characterization of 3d transition metal species in zeolites samples was reviewed from viewpoints of the pre-edge features. As the topic, changes in the coordination symmetry of Ti species in titanosilicates during hydration and dehydration, auto-reduction behavior of copper species in ZSM-5 by thermal treatment and re-oxidation by admission of NO, and V K_α or K_β5-selecting XAFS characterization of mesoporous V-TiO₂ under reaction condition of ethanol photo-oxidation were selected. The assignment of pre-edge peaks and dependence of the state of Cu 4p orbitals on symmetry and the valence were also surveyed. An intense preedge peak observed at K edge XANES spectra for tetrahedral species is due to electric dipole transition to p-character in the d-p hybridized orbitals.